Fimbristylis cymosa |
Fimbristylis miliacea |
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hurricanegrass |
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Habit | Plants perennial, cespitose, (5–)10–60 cm, bases hard, glabrous; rhizomes absent. | Plants annual, cespitose, 15–50(–70) cm, glabrous, base soft; rhizomes absent. |
Leaves | polystichous, mostly spreading-excurved, to 1/2 as long as culms; sheaths usually entire; ligule absent; blades linear, 2–3 mm wide, flat or shallowly involute, margin scabrid, apex blunt. |
distichous, in fans, to ca. 2/3 plant height; sheaths keeled, equitant, margins entire; ligule absent; blades bifacial (flattened in same plane as sheath), narrowly triangularlinear, to 2 mm wide, margins scabrid at least distally. |
Inflorescences | simple or compound anthelae with numerous small pedunculate clusters of sessile spikelets; scapes linear, distally terete, 1–2 mm thick; involucral bracts short, usually shorter than inflorescence. |
anthela compound, usually diffuse, branched, broadening upward, often as broad as long; scapes slender, angularly ribbed and/or somewhat compressed distally, 1–1.5 mm wide or thick; involucral bracts exceeded by anthela. |
Spikelets | greenish brown or yellow-brown, ovoid, 2–3 mm; fertile scales broadly ovate, 1–1.5 mm, obtuse or apically notched, midrib not excurrent. |
dark red-brown, broadly ovoid to near round, 2–4 min; fertile scales broadly ovate to orbiculate, 1 mm, glabrous, apex broadly rounded, midrib not excurrent. |
Flowers | stamens usually 1; styles 2-fid, slender, glabrous. |
stamens 1–2; styles 3-fid, slender, base dilated, apex pubescent. |
Achenes | dark brown to nearly black, tumidly obovoid, rarely obscurely 3-ribbed, 1 mm, faintly striate to variously warty, faintly reticulate. |
pale brown, tumid, obovoid, 1 mm, apiculate, reticulate, with pits narrowly rectangular in 4–6 vertical rows per side, the longitudinal ribs most prominent and mostly warty. |
2n | = 56. |
= 10. |
Fimbristylis cymosa |
Fimbristylis miliacea |
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Phenology | Fruiting all year. | Fruiting summer–fall, all year southward. |
Habitat | Sands of sea beaches, brackish sandy open sites, often disturbed, commonly just in from mangrove or on sandy road shoulders | Moist to wet sands and alluvia of open river and stream bottoms, low fields, drawdowns, shores, flatwoods, savanna, seeps, and open disturbed waste places |
Elevation | 0–50 m (0–200 ft) | 0–200 m (0–700 ft) |
Distribution |
FL; s Mexico; Central America; South America; Africa; Asia; Indian Ocean Islands; Pacific Islands; Australia |
AL; AR; FL; GA; KY; LA; MO; MS; NC; SC; TN; TX; Mexico; Central America; South America; Asia; Africa; Indian Ocean Islands; Pacific Ocean Islands; Australia [Introduced in North America] |
Discussion | New World examples of Fimbristylis cymosa are almost exclusively bicarpellate, with bifid styles; Old World Oceania examples are tricarpellate, with trifid styles, a form not covered in this treatment. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Fimbristylis miliacea is another widespread annual weed whose origin is probably in the Asian rice belt. Two Linnaean types bear the epithet “miliacea.” A good argument exists that Vahl, first to adopt the plant as a Fimbristylis, took the round-spikeleted element as F. miliacea; the other, ovoid, acute-spikeleted element thus became F. quinquangularis (Vahl) Kunth. Because Gaudichaud’s epithet “littoralis” was not applied to the complex until 1826, it is invalidated in any case. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 23, p. 128. | FNA vol. 23, p. 131. |
Parent taxa | Cyperaceae > Fimbristylis | Cyperaceae > Fimbristylis |
Sibling taxa | ||
Synonyms | F. melanospora, F. obtusifolia, F. sintenisii, F. spathacea, Scirpus obtusifolius | Scirpus miliaceus, F. littoralis, Isolepis miliacea, Scirpus bengalensis, Trichelostylis miliacea |
Name authority | R. Brown: Prodr., 228. (1810) | (Linnaeus) Vahl: Enum. Pl. 2: 287. (1805) |
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