Flora of North America species comparison

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Amphiscirpus

clubrush, Nevada bulrush, Nevada clubrush
Habit Herbs, perennial, internally mostly solid, without evident air cavities, cespitose or not, rhizomatous.
Culms

solitary or not, ± terete, tough, wiry.
Leaves

all basal;

sheaths often disintegrating into fibers;

ligules ciliate;

blades strongly C-shaped in cross section to subcylindric, tough, wiry.
Inflorescences

terminal, often pseudolateral, capitate;

spikelets 1–6(–10);

involucral bracts 1–3, spreading or erect, leaflike.
Spikelets

5–20 × 3–5 mm;

scales 30–60, spirally arranged, each subtending flower, smooth, glabrous, margins ciliolate.
Flowers

bisexual;

perianth of 1–6 bristles, straight, not longer than achene, retrorsely spinulose;

stamens 3;

styles deciduous, linear, 2-fid.
Achenes

plano-convex or unequally biconvex.

Amphiscirpus
Distribution
North America; South America
Discussion

Species 1.

Amphiscirpus was segregated from Scirpus (A. A. Oteng-Yeboah 1974) mainly on the basis of the culm anatomy, including the absence of internal air cavities. It differs from all species of Schoenoplectus in its prominently ciliate ligules. Amphiscirpus was treated within the high Andean Phylloscirpus (J. J. Bruhl 1995) and also as a distinct, monotypic genus (P. Goetghebeur and D. A. Simpson 1991).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 23, p. 27. Author: S. Galen Smith.
Parent taxa Cyperaceae
Subordinate taxa
A. nevadensis
Name authority Oteng-Yeboah: Notes Roy. Bot. Gard. Edinburgh 33: 308. (1974)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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