Bulbostylis capillaris

(Linnaeus) C. B. Clarke in J. D. Hooker

in J. D. Hooker, Fl. Brit. India 6: 652. 1893

Common names: Bulbostyle capillaire
Synonyms: Bulbostylis capillaris var. crebra FernaldBulbostylis capillaris var. isopoda FernaldFimbristylis capillaris (Linnaeus) Roemer & SchultesIsolepis brachyphylla SteudelIsolepis capillaris LinkIsolepis radiciflora SprengelScirpus brachyiphyllus (Linnaeus) BrittonScirpus muhlenbergii unknownStenophyllus capillaris unknown
Basionyms: Scirpus capillaris Linnaeus
Treatment appears in FNA Volume 23. Treatment on page 136. Mentioned on page 132, 135.
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Herbs, annual, cespitose. Culms to 30 cm, bases soft. Leaves 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. Inflorescences 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. Spikelets 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. Flowers: stamens (1–)2; anthers oblong-elliptic, 0.5–0.7 mm. Achenes yellowish to pale brown, trigonous-obovoid, 1 mm, faces rugose. 2n = 84.

Phenology: Fruiting summer–fall.
Habitat: Sandy savanna, prairie, arenaceous outcrops, sandy or gravelly waste areas
Elevation: 0–3000 m


V23 215-distribution-map.jpg

N.B., N.S., Ont., Que., Ala., Ariz., Ark., Calif., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.H., N.J., N.Mex., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Vt., Va., W.Va., Wis., Mexico, West Indies, Central America, South America, Asia, Pacific Islands.


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.



Lower Taxa

No lower taxa listed.