Fimbristylis vahlii |
Fimbristylis autumnalis |
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Vahl's fimbristylis, Vahl's fimbry |
fimbristyle d'automme, slender fimbry |
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Habit | Plants annual, cespitose, delicate, 4–15 cm, bases soft; rhizomes absent. | Plants annual, cespitose, 5–20(–30) cm, glabrous, plant base 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. |
distichous, shorter or longer than culms; sheaths keeled, entire or distally ciliate; ligule of short hairs complete; blades narrowly linear, 1–3 mm wide, flat, margin scabrid-ciliate. |
Inflorescence(s) | terminal; spikelets sessile or subsessile in single capitate leafy-involucrate cluster; scapes filiform; involucral bracts leafy, setaceous, greatly overtopping inflorescence. |
anthelae compound, mostly diffuse, mostly turbinate, as broad as long, ascending-branching; scapes filiform to linear, distally variously compressed, sometimes alate, 0.5–1.5(–2) mm wide, edges scabrid; primary involucral bract usually 1, blade exceeding or exceeded by anthela. |
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. |
red-brown or brown, mostly narrowly lanceoloid to narrowly ellipsoid, 3–7 mm; fertile scales lanceolate, keeled, 1.5–2 mm, narrowly acute, glabrous, midrib excurrent as mucro. |
Flowers | stamens 1; styles 2-fid, slender, bulbous-based, smooth or papillate. |
stamens (1–)2; styles 3-fid, slender, with 3angled base, glabrous. |
Achenes | pale, tumidly obovoid, 0.5–0.7 mm, cancellate, pits horizontally rectangular in 5–7 vertical rows per side. |
pale brown, trigonous-obovoid, 0.5–0.7 mm, apiculate and 3-ribbed, smooth to variably warty. |
2n | = 20. |
= 10. |
Fimbristylis vahlii |
Fimbristylis autumnalis |
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Phenology | Fruiting summer–fall. | Fruiting summer–fall, all year southward. |
Habitat | Moist to wet, alluvial or mineralized banks, shores, fluctuating pond and lake edges, often a “drawdown” plant around stock tanks and reservoirs | Moist to wet sands, peats, silts, or clays, primarily of disturbed, sunny ground such as seeps, ditches, savanna, stream banks, reservoir drawdowns, and pond shores |
Elevation | 0–500 m (0–1600 ft) | 0–500(–1000) m (0–1600(–3300) 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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AL; AR; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; NC; NE; NH; NJ; NY; OH; OK; PA; RI; SC; SD; TN; TX; VA; VT; WI; WV; NB; ON; QC
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Source | FNA vol. 23, p. 127. | FNA vol. 23, p. 130. |
Parent taxa | Cyperaceae > Fimbristylis | Cyperaceae > Fimbristylis |
Sibling taxa | ||
Synonyms | Scirpus vahlii, F. apus, F. congesta, F. vincentii, Isolepis vahlii, Scirpus apus | Scirpus autumnalis, F. autumnalis var. mucronulata, F. frankii, Scirpus michauxii, Scirpus mucronulatus, Trichelostylis geminata, Trichelostylis mucronulata |
Name authority | (Lamarck) Link: Hort. Berol. 1: 287. (1827) | (Linnaeus) Roemer & Schultes: in J. J. Roemer et al., Syst. Veg. 2: 97. (1817) |
Web links |
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