Fimbristylis vahlii |
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Vahl's fimbristylis, Vahl's fimbry |
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Habit | Plants annual, cespitose, delicate, 4–15 cm, bases soft; rhizomes absent. |
Leaves | polystichous, mostly spreading or excurved, often exceeding culms; sheaths entire, abaxially smooth or sparsely hirtellous; ligule absent; blades filiform, to 0.5 mm wide, somewhat involute, abaxially glabrous or ascending-strigillose. |
Inflorescences | terminal; spikelets sessile or subsessile in single capitate leafy-involucrate cluster; scapes filiform; involucral bracts leafy, setaceous, greatly overtopping inflorescence. |
Spikelets | greenish, cylindric to lanceoloid-cylindric, 5–10 mm; fertile scales narrowly ovate to lanceolate, 1–1.5 mm, acute, glabrous, midrib strong, excurrent as cusp. |
Flowers | stamens 1; styles 2-fid, slender, bulbous-based, smooth or papillate. |
Achenes | pale, tumidly obovoid, 0.5–0.7 mm, cancellate, pits horizontally rectangular in 5–7 vertical rows per side. |
2n | = 20. |
Fimbristylis vahlii |
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Phenology | Fruiting summer–fall. |
Habitat | Moist to wet, alluvial or mineralized banks, shores, fluctuating pond and lake edges, often a “drawdown” plant around stock tanks and reservoirs |
Elevation | 0–500 m (0–1600 ft) |
Distribution |
AL; AR; AZ; CA; FL; GA; IL; KS; KY; LA; MO; MS; NE; OK; SC; TN; TX; Mexico; Central America; South America
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Source | FNA vol. 23, p. 127. |
Parent taxa | Cyperaceae > Fimbristylis |
Sibling taxa | |
Synonyms | Scirpus vahlii, F. apus, F. congesta, F. vincentii, Isolepis vahlii, Scirpus apus |
Name authority | (Lamarck) Link: Hort. Berol. 1: 287. (1827) |
Web links |