Rhynchospora macrostachya

Torrey ex A. Gray

Ann. Lyceum Nat. Hist. New York 3: 206. 1835.

Synonyms: Ceratoschoenus macrostachyus (Torrey ex A. Gray) A. Gray Rhynchospora macrostachya var. colpophylla Fernald & Gale
Treatment appears in FNA Volume 23. Treatment on page 209. Mentioned on page 202, 210.
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Plants perennial, cespitose, 80–150(–170) cm, coarse; rhizomes absent. Culms stiffly erect, leafy, triangular, multiribbed. Leaves ascending, overtopped by inflorescence; blades flat proximally, 3–10(–15) mm wide, apex attenuate, trigonous. Inflorescences terminal and axillary, narrow, clusters of corymbs, clusters dense, mostly broadly turbinate, 13–15 mm; bracteal leaves mostly exceeding subtended compounds. Spikelets brown, lanceoloid, 13–15 mm, apex acuminate; fertile scales lanceolate, 10–13 mm, apex acuminate, midrib shortexcurrent. Flowers: longer perianth bristles usually fully 2 times length of fruit body, antrorsely barbellate. Fruits 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. 2n = 18.

Phenology: Fruiting summer–fall.
Habitat: Acidic sunny wetlands, mostly pond shores, seeps, bogs, marshlands
Elevation: 0–400 m


V23 359-distribution-map.jpg

Ala., Ark., Conn., Del., D.C., Fla., Ga., Ind., Kans., Ky., La., Maine, Md., Mass., Mich., Mo., N.J., N.Y., N.C., Okla., R.I., S.C., Tenn., Tex., Va.


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.

Selected References


Lower Taxa

... more about "Rhynchospora macrostachya"
Robert Kral +
Torrey ex A. Gray +
Ala. +, Ark. +, Conn. +, Del. +, D.C. +, Fla. +, Ga. +, Ind. +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Mo. +, N.J. +, N.Y. +, N.C. +, Okla. +, R.I. +, S.C. +, Tenn. +, Tex. +  and Va. +
0–400 m +
Acidic sunny wetlands, mostly pond shores, seeps, bogs, marshlands +
Fruiting summer–fall. +
Ann. Lyceum Nat. Hist. New York +
Illustrated +  and Endemic +
Ceratoschoenus macrostachyus +  and Rhynchospora macrostachya var. colpophylla +
Rhynchospora macrostachya +
Rhynchospora +
species +