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bulbostyle capillaire, densetuft hair-sedge, thread-leaf beakseed, tuft hair-sedge

Habit Herbs, annual, cespitose.

to 30 cm, bases soft.


spreading to ascending, ¼–1/3 length of scapes;

sheath borders tan, backs prominently ribbed, glabrous;

blades filiform, 0.5 mm wide, involute, margins ciliate-scabrid, surface glabrous.


solitary or more commonly in simple, open, rarely compact, involucrate anthelae;

scapes filiform (rarely with several spikelets sessile or subsessile at plant base), prominently ribbed, glabrous;

proximalmost involucral bract cuspidate or setaceous bladed, exceeding or exceeded by inflorescence.


red-brown, ovoid to lanceoloid, 3–5 mm;

fertile scales ovate, 1.5–2 mm, apex acute, glabrous or distally puberulent, keel prominent, short-excurrent.


stamens (1–)2;

anthers oblong-elliptic, 0.5–0.7 mm.


yellowish to pale brown, trigonous-obovoid, 1 mm, faces rugose.


= 84.

Bulbostylis capillaris

Phenology Fruiting summer–fall.
Habitat Sandy savanna, prairie, arenaceous outcrops, sandy or gravelly waste areas
Elevation 0–3000 m (0–9800 ft)
from FNA
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A specimen of Bulbostylis capillaris collected by E. Hall (585) gives Oregon without a specific locality.

Bulbostylis capillaris is distributed over a broad range of physiographic types and occurs in many forms, the most distinctive of ours being var. crebra, which has, in addition to numerous longscaped anthelae, large numbers of spikelets at the plant base.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 23, p. 136.
Parent taxa Cyperaceae > Bulbostylis
Sibling taxa
B. barbata, B. ciliatifolia, B. funckii, B. juncoides, B. schaffneri, B. stenophylla, B. warei
Synonyms Scirpus capillaris, B. capillaris var. crebra, B. capillaris var. isopoda, Fimbristylis capillaris, Isolepis brachyphylla, Isolepis capillaris, Isolepis radiciflora, Scirpus brachyiphyllus, Scirpus muhlenbergii, Stenophyllus capillaris
Name authority (Linnaeus) C. B. Clarke: in J. D. Hooker, Fl. Brit. India 6: 652. (1893)
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