Rhynchospora nivea


Linnaea 37: 527. 1872.

Synonyms: Dichromena diphylla Torrey Dichromena nivea (Boeckeler) Britton
Treatment appears in FNA Volume 23. Treatment on page 216. Mentioned on page 215.
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Plants perennial, cespitose, 10–40 cm, wiry; rhizomes absent. Culms erect to spreading-ascending, leafybased, trigonous or compressed, ribbed. Leaves exceeded by scape; blades narrowly linear to filiform, 0.2–2 mm wide, apex tapering, trigonous. Inflorescences terminal, solitary, headlike, dense, white, leafyinvolucrate, hemispheric to globose, 0.5–1.5 cm wide; involucral bracts (0–)1–4, ascending to recurved, green, (0.7–)2–5(–6) cm × 0.2–2 mm. Spikelets white, ovoid, 5–7 mm; fertile scales several, boat-shaped, 2.5–3.5 mm, keel curved, not sharp. Flowers: perianth absent. Fruits 0.8–1 mm; body yellow to near black, broadly pyriform-obovoid, tumidly lenticular, 0.5–0.8 × 0.5–0.8 mm, margin narrow, flowing into tubercle; surfaces transversely sharply wavyrugose, ridges bordered by rows of fine, linear, vertical lattices; tubercle depressedtriangular, lunate-based, shortbeaked 0.2(–0.3) mm, gray-crustaceous.

Phenology: Fruiting spring–fall.
Habitat: Low, open, moist to wet, basic substrates of fens, meadows, seeps, and shores, limestone districts
Elevation: 0–500 m


Rhynchospora nivea, of the “Dichromena” of North America, is the smallest fruited and most slender and has the fewest and shortest involucral bracts (in some plants the bract is entirely absent). Involucral bracts of R. nivea are almost entirely green.

Selected References


Lower Taxa

... more about "Rhynchospora nivea"
Robert Kral +
Boeckeler +
Okla. +  and Tex. +
0–500 m +
Low, open, moist to wet, basic substrates of fens, meadows, seeps, and shores, limestone districts +
Fruiting spring–fall. +
Illustrated +  and Endemic +
Dichromena diphylla +  and Dichromena nivea +
Rhynchospora nivea +
Rhynchospora +
species +