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Montana Field Guide

Montana Field Guides

Tall Dropseed - Sporobolus compositus
Other Names:  Sporobolus asper

Species of Concern

Global Rank: G5
State Rank: SH
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value:

External Links






State Rank Reason (see State Rank above)
Known in Montana from 3 collections; a 1939 collection near Ekalaka, a 1957 collection from Fort Keogh Livestock and Range Laboratory and a 1980 collection from Bighorn County.
 
General Description
Perennial. Stems 30–80 cm. Leaves: blades 2–4 mm wide; throat with a tuft of hairs. Inflorescence a contracted panicle 5–15 cm long, mostly enclosed in leaf sheath. Spikelets 4–6 mm long. Lemmas 3–6 mm long (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Phenology
Mature fruit in August.

Diagnostic Characteristics
Both S. cryptandrus and S. airoides have spikelets less than 3 mm long and more open inflorescences.

Species Range
Unknown/Undetermined
 


Range Comments
Collected in Carter County; sporadic throughout most of N. America (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 3

(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
Open forests and grasslands on the plains.

References
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Citation for data on this website:
Tall Dropseed — Sporobolus compositus.  Montana Field Guide.  .  Retrieved on , from