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Montana Field Guides

Small Dropseed - Sporobolus neglectus

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Species of Concern
Native Species

Global Rank: G5
State Rank: S1S2
(see State Rank Reason below)
State Threat Score: No Known Threats
C-value: 4


Agency Status
USFWS:
USFS:
BLM:


 

External Links

State Rank Reason (see State Rank above)
Rare in Montana, where it is known from a few widely scattered and poorly documented sites.
 
General Description
Annual. Stems 10–40 cm. Leaves: blades 1–2 mm wide; throat with a tuft of hairs. Inflorescence a narrow panicle 1–4 cm long, partially enclosed in leaf sheath. Spikelets 2–3 mm long. Lemmas 1.5–2.9 mm long (Lavin in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Phenology
Mature fruit in August-September.

Diagnostic Characteristics
Small Dropseed - Sporobolus neglectus, SOC
*Habit: Annual.
*Panicle: Contracted (narrow), less than 4 cm long, and usually partially enclosed by the leaf sheath.
*Spikelets: 2-3 mm long.

Tall Dropseed - Sporobolus compositus, SOC
*Habit: Perennial.
*Panicle: Contracted (appressed), but much longer than wide and usually partially enclosed in the leaf sheath.
*Stem: Base is erect.
*Spikelets: 3 mm or more long. Both glumes are not as long or longer than the lemma.

Alkali Dropseed - Sporobolus airoides
*Habit: Perennial.
*Panicle: Diffuse, greater than 4 centimeters long, and about as long as wide and usually fully exerted from the leaf sheath.
*Stem: Base is decumbent.
*Spikelets: 2-2.5 mm long.

Sand Dropseed - Sporobolus cryptandrus
*Habit: Perennial.
*Panicle: Contracted (appressed), greater than 4 centimeters long, and much longer than wide and enclosed in an arcuate leaf sheath.
*Stem: Base is erect.
*Spikelets: 2.5 mm or shorter. Both glumes are not as long or longer than the lemma.

Prairie Dropseed - Sporobolus heterolepis, not documented in Montana
*Habit: Perennial.
*Panicle: Open, greater than 4 centimeters long, and much longer than wide and usually entirely exerted from the leaf sheath.
*Spikelets: At least one of the glumes is as long or longer than the lemma.

Species Range
Montana Range Range Descriptions

Native
 


Range Comments
Throughout much of North America excepting the Intermountain Region and the very southeast (Lavin in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 5

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Grasslands in the valleys and on the plains; both natural and disturbed habitats are represented in MT.
Predicted Suitable Habitat Model

This species has a Predicted Suitable Habitat Model available.

To learn how these Models were created see mtnhp.org/models


Threats or Limiting Factors
STATE THREAT SCORE REASON
Threat impact not assigned because threats are not known (MTNHP Threat Assessment 2021).

References
  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • MTNHP Threat Assessment. 2021. State Threat Score Assignment and Assessment of Reported Threats from 2006 to 2021 for State-listed Vascular Plants. Botany Program, Montana Natural Heritage Program, Helena, Montana.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Brey, C.W. 1998. Epidemiology of wheat curl mite (Aceria tosichella K.) and wheat streak mosaic virus on feral grass species and effect of glyphosate on wheat curl mite dispersal. Ph.D. Dissertation. Bozeman, MT: Montana State University. 136 p.
    • Flora of North America Editorial Committee. 2003. Flora of North America North of Mexico. Vol. 25. Magnoliophyta: Commelinidae (in part): Poaceae, part 2. Oxford Univ. Press, New York. xxv + 781 pp.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
  • Web Search Engines for Articles on "Small Dropseed"
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Citation for data on this website:
Small Dropseed — Sporobolus neglectus.  Montana Field Guide.  .  Retrieved on , from