Natural Resources
Conservation Service
Ecological site R034AY142WY
Saline Subirrigated
Green River and Great Divide Basins (SS)
Last updated: 2/24/2025
Accessed: 04/22/2026
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Provisional. A provisional ecological site description has undergone quality control and quality assurance review. It contains a working state and transition model and enough information to identify the ecological site.
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Figure 1. Mapped extent
Areas shown in blue indicate the maximum mapped extent of this ecological site. Other ecological sites likely occur within the highlighted areas. It is also possible for this ecological site to occur outside of highlighted areas if detailed soil survey has not been completed or recently updated.
Associated sites
R034AY138WY Saline Lowland Green River and Great Divide Basins (SL)
Saline Lowland
R034AY174WY Subirrigated Green River and Great Divide Basins (Sb)
Subirrigated
R034AY178WY Wetland Green River and Great Divide Basins (WL)
Wetland
R034AY128WY Lowland Green River and Great Divide Basins (LL)
Lowland
Similar sites
R034AY138WY Saline Lowland Green River and Great Divide Basins (SL)
Saline Lowland (SL) 7-9GR has more greasewood.
R034AY242WY Saline Subirrigated Foothills and Basins West (SS)
Saline Subirrigated (SS) 10-14W has higher production.
Table 1. Dominant plant species
Tree Not specified
Shrub Not specified
Herbaceous Not specified
Physiographic features
This site occurs on nearly level land along perennial or intermittent streams, near seeps, sloughs, or springs. It is also found on broad, low lake terraces, lake plains, flood plains, on alluvial bottoms, and poorly-drained bottom lands adjacent to stream channels. These areas receive additional run-in water from higher sites and from a fluctuating water table, well within the root zone. Slopes are most commonly less than 3%.
Table 2. Representative physiographic features
Landforms (1) Alluvial fan
(2) Drainageway
(3) Stream terrace
Flooding duration Very brief (4 to 48 hours) to brief (2 to 7 days) Flooding frequency Occasional to frequent Ponding frequency None Elevation 6000 – 7200 ft Slope 0 – 10 % Ponding depth 0 in Water table depth 12 – 40 in Aspect Aspect is not a significant factor Climatic features
Annual precipitation ranges from 7-9 inches per year. Wide fluctuations may occur in yearly precipitation and result in more dry years than those with more than normal precipitation. Temperatures show a wide range between summer and winter and between daily maximums and minimums. This is predominantly due to the high elevation and dry air, which permits rapid incoming and outgoing radiation. Cold air outbreaks in winter move rapidly from northwest to southeast and account for extreme minimum temperatures. Extreme storms may occur during the winter, but most severely affect ranch operations during late winter and spring.
Daytime winds are generally stronger than nighttime and occasional strong storms may bring brief periods of high winds with gusts to more than 50 mph.
Growth of native cool season plants begins about April 15 and continues to about July 15. Some green up of cool season plants may occur in September if moisture is available.
For detailed information visit the Natural Resources Conservation Service National Water and Climate Center at http://www.wcc.nrcs.usda.gov/cgibin/state.pl?state=wy website. Other climate stations representative of this precipitation zone include “Bitter Creek”, ”Farson ”, “Rock Springs FAA AP”, and “Wamsutter” in Sweetwater County; “Church Buttes Gas PLT”, and Mountain View” in Uinta County; “Fontenelle”, “La Barge”, and “Sage 4 NNW” in Lincoln County; and “Big Piney” in Sublette County.Table 3 Representative climatic features
Frost-free period (average) 120 days Freeze-free period (average) 130 days Precipitation total (average) 10 in BarLineFigure 2. Monthly precipitation range
BarLineFigure 3. Monthly average minimum and maximum temperature
">Influencing water features
Stream type: C (Rosgen)
Soil features
These are deep, saline, usually sodic soils on stream terraces. Sand and gravel may be at depths of 40 to 60 inches. The water table fluctuates during the growing season and is generally between 20-40 inches. Moderate to strong salt and alkali concentration in conjunction with moderately deep water tables characterize these soils. Salt crusts are commonly found on ridges and mounds during dry periods. Mottling or gleying may occur within 20-40 inches of the surface.
Major Soil Series correlated to this site include: Gunbarrel, Saleratus and phases of the Clowers, Leckman, and Pescar series.Table 4. Representative soil features
Surface texture (1) Loam
(2) Fine sandy loam
(3) Sandy loam
Family particle size (1) Loamy
Drainage class Somewhat poorly drained to moderately well drained Permeability class Moderate Soil depth 15 – 60 in Surface fragment cover <=3" 0 – 10 % Surface fragment cover >3" Not specified Available water capacity
(0-40in)3.5 – 5 in Calcium carbonate equivalent
(0-40in)0 – 10 % Electrical conductivity
(0-40in)8 – 16 mmhos/cm Sodium adsorption ratio
(0-40in)5 – 15 Soil reaction (1:1 water)
(0-40in)8 – 9 Subsurface fragment volume <=3"
(Depth not specified)0 – 10 % Subsurface fragment volume >3"
(Depth not specified)0 – 5 % Ecological dynamics
As this site deteriorates from improper grazing management, species such as inland saltgrass and greasewood increase. Grasses such as alkali sacaton, basin wildrye, and Nuttall’s alkaligrass will decrease in frequency and production. Basin wildrye will disappear from this site when hayed or with extended improper grazing during spring and summer.
These plant communities narratives may not represent every possibility, but they probably are the most prevalent and repeatable plant communities. The plant composition tables shown above have been developed from the best available knowledge at the time of this revision. As more data is collected, some of these plant communities may be revised or removed, and new ones may be added. None of these plant communities should necessarily be thought of as “Desired Plant Communities”. According to the USDA NRCS National Range and Pasture Handbook, Desired Plant Communities (DPC’s) will be determined by the decision-makers and will meet minimum quality criteria established by the NRCS. The main purpose for including any description of a plant community here is to capture the current knowledge and experience at the time of this revision.
The Reference Plant Community (description follows the plant community diagram) has been determined by study of rangeland relic areas, or areas protected from excessive disturbance. Trends in plant communities going from heavily grazed areas to lightly grazed areas, seasonal use pastures, and historical accounts have also been used.
The following is a State and Transition Model Diagram that illustrates the common plant communities (states) that can occur on the site and the transitions between these communities. The ecological processes will be discussed in more detail in the plant community narratives following the diagram.State and transition model
More interactive model formats are also available. View Interactive Models
Click on state and transition labels to scroll to the respective textEcosystem states
State 1 submodel, plant communities
State 2 submodel, plant communities
State 3 submodel, plant communities
State 4 submodel, plant communities
State 1
Alkali Sacaton/Basin Wildrye (Reference)Community 1.1
Alkali Sacaton/Basin Wildrye (Reference)The interpretive plant community for this site is the Reference Plant Community. This state evolved with grazing by large herbivores and is suited for grazing by domestic livestock. Potential vegetation is estimated at 80% grasses or grass-like plants, 10% forbs and 10% woody plants.
Saline tolerant species dominate the site. The major grasses include alkali sacaton, basin wildrye, and Nuttall’s alkaligrass. Other grasses that may occur on this site include alkali bluegrass, alkali muhly, inland sedge, rhizomatous wheatgrass, Baltic rush, inland saltgrass, and Nebraska sedge. Common woody plants are greasewood and rubber rabbitbrush.
A typical plant composition for this state consists of Alkali sacaton 35-45%, Basin wildrye 15-30%, Nuttall’s alkaligrass 10-20%, other grasses and grass-like plants 10-20%, perennial forbs 5-15%, greasewood 1-5%, and up to 5% rubber rabbitbrush. Ground cover, by ocular estimate, varies from 65-75%.
The total annual production (air-dry weight) of this state is about 2500 pounds per acre, but it can range from about 2000 lbs./acre in unfavorable years to about 2800 lbs./acre in above average years.
The state is stable and well adapted to the Cool Central Desertic Basins and Plateaus climatic conditions. It is a critical state providing water and habitat for the surrounding area. It is resistant to drought due to a dependable water supply. This is a sustainable plant community (site/soil stability, watershed function, and biologic integrity).
Transitions or pathways leading to other plant communities are as follows:
• Continuous Season-long Grazing will convert this plant community to the Alkali Muhly/Alkali Bluegrass State.
• Noxious Weed Invasion will convert this plant community to the Salt Cedar/Inland Saltgrass State.
• Plowing & Cropping (haying) followed by abandonment will convert this plant community to the Foxtail Barley/Quackgrass State.Figure 4. Annual production by plant type (representative values) or group (midpoint values)
Table 5. Annual production by plant type
Plant type Low
(lb/acre)Representative value
(lb/acre)High
(lb/acre)Grass/Grasslike 1600 2000 2240 Shrub/Vine 200 250 280 Forb 200 250 280 Total 2000 2500 2800 Figure 5. Plant community growth curve (percent production by month). WY0403 , 7-9GR, Free Water Sites - WL, Sb, SS. WL, SB, SS Free Water Sites.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec J F M A M J J A S O N D 0 0 0 5 20 40 20 10 5 0 0 0 State 2
Alkali Muhly/Alkali BluegrassCommunity 2.1
Alkali Muhly/Alkali BluegrassThis plant community evolved under continuous grazing by domestic livestock. Saline tolerant grasses make up the majority of the understory. Dominant grasses include alkali muhly and alkali bluegrass.
The total annual production (air-dry weight) of this state is about 1500 pounds per acre, but it can range from about 1000 lbs./acre in unfavorable years to about 1800 lbs./acre in above average years.
The state is stable and protected from excessive erosion. The biotic integrity of this plant community is at risk due to decreased species diversity. The watershed is usually functioning.
Transitional pathways leading to other plant communities are as follows:
• Prescribed Grazing will result in a plant community very similar to the Reference Plant Community (Alkali Sacaton/Basin Wildrye State).
• Noxious Weed Invasion will convert this plant community to the Salt Cedar/Inland Saltgrass State.Figure 6. Plant community growth curve (percent production by month). WY0403 , 7-9GR, Free Water Sites - WL, Sb, SS. WL, SB, SS Free Water Sites.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec J F M A M J J A S O N D 0 0 0 5 20 40 20 10 5 0 0 0 State 3
Foxtail Barley/QuackgrassCommunity 3.1
Foxtail Barley/QuackgrassThis plant community is the result of plowing and cropping practices, typically haying. Following abandonment or with improper management, foxtail barley and quackgrass dominate. Povertyweed is a common forb on this site. Basin wildrye will disappear very quickly.
The total annual production (air-dry weight) of this state is about 1000 pounds per acre, but it can range from about 500 lbs./acre in unfavorable years to about 2300 lbs./acre in above average years.
The state is moderately stable with some bare ground present. The biotic integrity of this plant community has been compromised, especially with introduction of nonnative, shallow-rooted species, and noxious weed invasion. The watershed is at risk.
Transitional pathways leading to other plant communities are as follows:
• Noxious Weed Invasion will convert this plant community to the Salt Cedar/Inland Saltgrass State.
• Chemical Seedbed Preparation and Re-seeding followed by 1 to 2 years deferment as part of a Prescribed Grazing plan over the long-term may return this state to near Reference Plant Community (Alkali Sacaton/Basin Wildrye State). However, introduced and noxious weeds such as foxtail barley and quackgrass will persist to some degree.Figure 7. Plant community growth curve (percent production by month). WY0403 , 7-9GR, Free Water Sites - WL, Sb, SS. WL, SB, SS Free Water Sites.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec J F M A M J J A S O N D 0 0 0 5 20 40 20 10 5 0 0 0 State 4
Salt Cedar/Inland SaltgrassCommunity 4.1
Salt Cedar/Inland SaltgrassThis plant community evolved under frequent and severe grazing accompanied by the introduction of noxious weeds, mainly salt cedar and Russian knapweed. Inland saltgrass persists in the understory, but annual forbs and weeds have invaded the site. Salt Cedar comprises 80-90% of the annual production on the site.
The total annual production (air-dry weight) of this state is about 500 pounds per acre, but it can range from about 200 lbs./acre in unfavorable years to about 800 lbs./acre in above average years.
Bare ground has increased. The soil of this state is not well protected from erosion. The watershed is at risk and may produce excessive runoff.
Transitional pathways leading to other plant communities are as follows:
• Chemical Seedbed Preparation and Re-seeding followed by deferment for 1 to 2 years as part of a Prescribed Grazing plan over the long-term may result in a plant community very similar to the Reference Plant Community (Alkali Sacaton/Basin Wildrye State), except that noxious weeds will persist to some degree. Additional deferment may be necessary and should be prescribed on an individual site basis.Figure 8. Plant community growth curve (percent production by month). WY0403 , 7-9GR, Free Water Sites - WL, Sb, SS. WL, SB, SS Free Water Sites.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec J F M A M J J A S O N D 0 0 0 5 20 40 20 10 5 0 0 0 Transition T1A
State 1 to 2Continuous Season-long Grazing will convert this plant community to the Alkali Muhly/Alkali Bluegrass State.
Transition T1B
State 1 to 3Plowing & Cropping (haying) followed by abandonment will convert this plant community to the Foxtail Barley/Quackgrass State.
Transition T1C
State 1 to 4Noxious Weed Invasion will convert this plant community to the Salt Cedar/Inland Saltgrass State.
Restoration pathway R2A
State 2 to 1Prescribed Grazing will result in a plant community very similar to the Reference Plant Community (Alkali Sacaton/Basin Wildrye State).
Transition T2A
State 2 to 4Noxious Weed Invasion will convert this plant community to the Salt Cedar/Inland Saltgrass State.
Restoration pathway R3A
State 3 to 1Seedbed Preparation and Re-seeding followed by 1 to 2 years deferment as part of a Prescribed Grazing plan over the long-term may return this state to near Reference Plant Community (Alkali Sacaton/Basin Wildrye State). However, introduced and noxious weeds such as foxtail barley and quackgrass will persist to some degree.
Transition T3A
State 3 to 4Noxious Weed Invasion will convert this plant community to the Salt Cedar/Inland Saltgrass State.
Restoration pathway R4A
State 4 to 1Chemical Seedbed Preparation and Re-seeding followed by deferment for 1 to 2 years as part of a Prescribed Grazing plan over the long-term may result in a plant community very similar to the Reference Plant Community (Alkali Sacaton/Basin Wildrye State), except that noxious weeds will persist to some degree. Additional deferment may be necessary and should be prescribed on an individual site basis.
Additional community tables
Table 6. Community 1.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Grass/Grasslike1 875–1125 alkali sacaton SPAI Sporobolus airoides 875–1125 – 2 375–750 basin wildrye LECI4 Leymus cinereus 375–750 – 3 250–500 Nuttall's alkaligrass PUNU2 Puccinellia nuttalliana 250–500 – 4 250–500 Grass, perennial 2GP Grass, perennial 0–125 – inland sedge CAIN11 Carex interior 0–125 – Nebraska sedge CANE2 Carex nebrascensis 0–125 – saltgrass DISP Distichlis spicata 0–125 – mountain rush JUARL Juncus arcticus ssp. littoralis 0–125 – scratchgrass MUAS Muhlenbergia asperifolia 0–125 – western wheatgrass PASM Pascopyrum smithii 0–125 – Sandberg bluegrass POSE Poa secunda 0–125 – Forb5 125–375 Forb, perennial 2FP Forb, perennial 0–125 – milkvetch ASTRA Astragalus 0–125 – scouringrush horsetail EQHY Equisetum hyemale 0–125 – arrowgrass TRIGL Triglochin 0–125 – Shrub/Vine6 25–125 greasewood SAVE4 Sarcobatus vermiculatus 25–125 – 7 25–125 rubber rabbitbrush ERNA10 Ericameria nauseosa 25–125 – Table 7. Community 2.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 8. Community 3.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 9. Community 4.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Interpretations
Animal community
Animal Community – Wildlife Interpretations
Alkali Sacaton/Basin Wildrye Plant Community (HCPC): This plant community is very important for many of the wildlife species in the area. With the presence of water at or near the soil surface, over 80% of all wildlife will use this site to fulfill some part of their habitat needs. It provides forage for mule deer and antelope. It provides nesting habitat for shorebirds, songbirds, and waterfowl as well as ground nesting birds such as harriers. The lush herbaceous material produces insects for sage grouse brood rearing and foraging. Dense ground cover provides escape cover, forage, and breeding areas for small mammals which draw predators such as raptors, red fox and coyote. Other birds that would frequent this plant community include red-wing blackbirds, sandhill cranes, western meadowlarks, and neotropical migrants.
Alkali Muhly/Alkali Bluegrass Plant Community: This plant community may be beneficial for the same wildlife that would use the Historic Climax Plant Community. However, the plant community composition is less diverse, and thus, less apt to meet the seasonal needs of these animals. It may provide some foraging opportunities for sage grouse when it occurs proximal to woody cover.
Foxtail Barley/Quackgrass Plant Community: This plant community exhibits a low level of plant species diversity. In most cases, it is not a desirable plant community to select as a wildlife habitat management objective.
Salt Cedar/Inland Saltgrass Plant Community: This plant community exhibits a low level of plant species diversity due to the accumulation of salts in the soil. It may provide some thermal and escape cover for deer and moose if no other woody community is nearby, but in most cases it is not a desirable plant community to select as a wildlife habitat management objective.
Animal Community – Grazing Interpretations
The following table lists suggested stocking rates for cattle under continuous season-long grazing under normal growing conditions. These are conservative estimates that should be used only as guidelines in the initial stages of the conservation planning process. Often, the current plant composition does not entirely match any particular plant community (as described in this ecological site description). Because of this, a field visit is recommended, in all cases, to document plant composition and production. More precise carrying capacity estimates should eventually be calculated using this information along with animal preference data, particularly when grazers other than cattle are involved. Under more intensive grazing management, improved harvest efficiencies can result in an increased carrying capacity.
Plant Community Production (lb./ac)and Carrying Capacity* (AUM/ac)
Alkali Sacaton/Basin Wildrye (HCPC) 2000-2800 lb./ac and .8 AUM/ac
Alkali Muhly/Alkali Bluegrass 1000-1800 lb./ac and .5 AUM/ac
Foxtail Barley/Quackgrass 500-2300 lb./ac and .3 AUM/ac
Salt Cedar/Inland Saltgrass 200-800 lb./ac and .2 AUM/ac
* - Continuous, season-long grazing by cattle under average growing conditions.
Grazing by domestic livestock is one of the major income-producing industries in the area. Rangeland in this area may provide yearlong forage for cattle, sheep, or horses. During the dormant period, the forage for livestock use needs to be supplemented with protein because the quality does not meet minimum livestock requirements.Hydrological functions
Salinity/alkalinity is the principal factor limiting forage production on this site. This site is dominated by soils in hydrologic groups C and D. Infiltration ranges from moderately slow to moderately well. Runoff potential for this site varies from moderate to high depending on soil hydrologic group and ground cover. In many cases, areas with greater than 75% ground cover have the greatest potential for high infiltration and lower runoff. Areas where ground cover is less than 50% have the greatest potential to have reduced infiltration and higher runoff (refer to Part 630, NRCS National Engineering Handbook for detailed hydrology information).
Rills and gullies should not typically be present. Water flow patterns should be barely distinguishable if at all present. Pedestals are only slightly present in association with bunchgrasses. Litter typically falls in place, and signs of movement are not common. Chemical and physical crusts are sometimes present.Recreational uses
This site provides a variety of hunting opportunities as well providing popular camping areas for recreationists. This site has a wide variety of forbs which bloom throughout spring and summer, providing esthetic values that appeal to visitors.
Wood products
No appreciable wood products are present on the site.
Other products
None noted.
Supporting information
Inventory data references
Inventory Data References (narrative) Information presented here has been derived from NRCS clipping data and other inventory data. Field observations from range trained personnel were also used. Those involved in developing this site include: Bill Christensen, Range Management Specialist, NRCS; Karen Clause, Range Management Specialist, NRCS; and Everet Bainter, Range Management Specialist, NRCS. Other sources used as references include: USDA NRCS Water and Climate Center, USDA NRCS National Range and Pasture Handbook, and USDA NRCS Soil Surveys from various counties. Inventory Data References Data Source Number of Records Sample Period State County SCS-RANGE-417 50 1966-1985 WY Sweetwater & others
Contributors
Karen Clause
Approval
Kirt Walstad, 2/24/2025
Rangeland health reference sheet
Interpreting Indicators of Rangeland Health is a qualitative assessment protocol used to determine ecosystem condition based on benchmark characteristics described in the Reference Sheet. A suite of 17 (or more) indicators are typically considered in an assessment. The ecological site(s) representative of an assessment location must be known prior to applying the protocol and must be verified based on soils and climate. Current plant community cannot be used to identify the ecological site.
Author(s)/participant(s) K. Clause, B. Brazee, J. Haverkamp, E. Bainter Contact for lead author karen.clause@wy.usda.gov or 307-367-2257 Date 03/16/2007 Approved by Approval date Composition (Indicators 10 and 12) based on Annual Production Indicators
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Number and extent of rills:
Rare to nonexistent. -
Presence of water flow patterns:
Barely observable. -
Number and height of erosional pedestals or terracettes:
Rare to nonexistent. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
Bare ground can range from 0-5%. -
Number of gullies and erosion associated with gullies:
Active gullies should not be present. -
Extent of wind scoured, blowouts and/or depositional areas:
Minimal to nonexistent. -
Amount of litter movement (describe size and distance expected to travel):
Herbaceous litter not expected to move. -
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
Soil Stability Index ratings range from 1 (interspaces) to 6 (under plant canopy), but average values should be 4.0 or greater. -
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
Typically an A-horizon of greater than 2 inches (5 cm) with massive structure and color hues of 10YR or 2.5Y, values of 5-6, and chromas of 2-3. Organic matter is typically less than 1%. -
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Plant community consists of 75-85% grasses, 15% forbs, and 0-10% shrubs. Dense plant canopy (70-100%) and litter plus moderate to rapid infiltration rates result in minimal to nonexistent runoff until soils are saturated. Basal cover is typically greater than 5% for this site and effectively reduces runoff on this site. -
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
No compaction layer exists. -
Functional/Structural Groups (list in order of descending dominance by above-ground annual-production or live foliar cover using symbols: >>, >, = to indicate much greater than, greater than, and equal to):
Dominant:
Sub-dominant:
Other:
Additional:
warm season bunchgrasses>>tall, cool season bunchgrasses>>perennial forbs>mid-size, cool season bunchgrasses=cool season rhizomatous grasses=warm season rhizomatous grasses>perennial shrubs -
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
Decadence minimal to nonexistent. -
Average percent litter cover (%) and depth ( in):
Litter ranges from 5-30% of total canopy measurement with total litter (including beneath the plant canopy) from 75-95% expected. Herbaceous litter depth typically ranges from 10-25 mm. -
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
English: 2000-2800 lb/ac (2500 lb/ac average); Metric: 2240-3136 kg/ha (2800 kg/ha average). -
Potential invasive (including noxious) species (native and non-native). List species which BOTH characterize degraded states and have the potential to become a dominant or co-dominant species on the ecological site if their future establishment and growth is not actively controlled by management interventions. Species that become dominant for only one to several years (e.g., short-term response to drought or wildfire) are not invasive plants. Note that unlike other indicators, we are describing what is NOT expected in the reference state for the ecological site:
Bare ground greater than 30% is the most common indicator of a threshold being crossed. Alkali muhly, inland saltgrass, and alkali bluegrass are common increasers. Annual weeds such as halogeton, kochia, and Russian thistle are common invasive species in disturbed sites. -
Perennial plant reproductive capability:
All species are capable of reproducing, except in drought years.
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