Rhynchospora macrostachya
tall beaksedge, tall horned beaksedge
stiffly erect, leafy, triangular, multiribbed.
ascending, overtopped by inflorescence;
blades flat proximally, 3–10(–15) mm wide, apex attenuate, trigonous.
terminal and axillary, narrow, clusters of corymbs, clusters dense, mostly broadly turbinate, 13–15 mm;
bracteal leaves mostly exceeding subtended compounds.
brown, lanceoloid, 13–15 mm, apex acuminate;
fertile scales lanceolate, 10–13 mm, apex acuminate, midrib shortexcurrent.
longer perianth bristles usually fully 2 times length of fruit body, antrorsely barbellate.
1–2 per spikelet, 20–25 mm;
body pyriformobovoid, compressed, 5–6 × 2.6–3.6 mm;
tubercle attenuate, 2-grooved, (15–)18–20(–21) mm.
= 18.
Rhynchospora macrostachya
Rhynchospora macrostachya is quickly distinguished from other species of its complex by more compact clusters, arranged on successive mid and distal nodes to present a narrow inflorescence outline. Its perianth bristles and fruit tubercles are the longest in the complex, probably in the entire genus.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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