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Bulbostylis Kunth

Kingdom: Plantae Rank: Genus Parent: Cyperaceae Status: Valid

Common Names:

  • HAIR SEDGE - English, United States of America

Morphological Description

Diagnosis: Ours small tufted annuals or short-lived perennials with fibrous roots; leaves basal, filiform or setaceous; inflorescence a small, simple or compound, umbel-like cyme (sometimes referred to as an anthela) at end of flowering culm, short-bracted, only 1 bract prominent; spikelets several- flowered; scales of spikelets spirally imbricate, keeled; perianth bristles absent; achenes trigonous-obovoid, ca. 1 mm long; style base persistent as a minute tubercle.


Notes: A genus of ca. 100 species (Kral 2002c) of tropical and warm areas, with the center of diversity in tropical Africa (Tucker 1987); previously included in Fimbristylis. The tubercle (= caplike persistent style base differing in appearance from actual achene) of Bulbostylis distinguishes it from Fimbristylis (which lacks a tubercle). Kral (1971) and Tucker (1987) discussed separation of the two genera. The diminutive members of this genus have been described as “wispy” and “easily overlooked in the field” (Yatskievych 1999); they are often found in dry sandy habitats. The 4 East TX species differ in chromosome number (Tucker 1987). (Greek: bolbos, swelling or bulb, and stylos, pillar, column, or style)