Pendulous Bulrush - Scirpus pendulus
State Rank Reason (see State Rank above)
One collection from Ravalli County where there are a few patches in an area heavily used by waterfowl. Possibly accidental. Not listed for Montana in FNA vol. 23. More information is needed to determine the status of the species in the state.
Stems 30–80 cm, clustered on short rhizomes. Leaves: blades 2–6 mm wide; basal sheaths whitish. Inflorescence open, cymose; spikelets on individual short peduncles. Spikelets 3–8 mm long. Scales 1.5–2 mm long, brown with prominent green midribs; tip apiculate. Flowers: bristles 6, strongly contorted, smooth, brown, longer than the achene; stigmas 3. Achene 3-sided, gray-brown, ca. 1 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
The combination of scales with a green midrib and bristles ca. twice as long as the achene separate this species from the similar S. cyperinus, S. microcarpus, and S. pallidus. A hand lens will be necessary for positive identification.
OR to QC south to CA, AZ, NM, TX, AL and FL. Known from Missoula County (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Marshes and pond margins on the plains.
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- Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.