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(Last Modified On 10/18/2012)
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(Last Modified On 10/18/2012)
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Genus
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LASIACIS
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PlaceOfPublication
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Contr. U. S. Nat. Herb. 15:16. 1910.
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Description
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Spikelets paniculate, subglobose, somewhat inflated, placed obliquely on the pedicels; glumes and sterile lemma papery, usually lanate-pubescent at the tip; first glume one-third to half as long as the spikelet, broad and clasping, the second glume and sterile lemma nearly equal, a little shorter to a little longer than the fertile floret; fruit bony-indurate, blunt, the lemma and palea with a tuft of short hairs from a minute depression at the tip, the margins of the lemma firm but not inrolled; palea convex above, the tip often free at maturity
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Note
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Trailing vines or coarse, woody, cane-like, high-clambering perennials with fascicled branches and open or sometimes contracted panicles terminating the culm and leafy branches, the blades and panicles of the branches usually reduced.
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Key
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a. Blades cordate-clasping, usually elongate, as much as 5 cm. wide -- 1. L. PROCERRIMA aa. Blades not cordate-clasping. b. Plants without a strong central cane, creeping or low-clambering, rooting at the nodes. c. Ligule 0.5-1 mm. long, pale, truncate. Panicles loosely flowered, the spikelets in pairs at the ends of the branches and branchlets-_ 2. L. MAXONI cc. Ligule 3-8 mm. long, dark brown, usually lacerate. d. Panicles 5-6 cm. long, scarcely exserted from the sheath, the branches and branchlets finally stiffly spreading or reflexed-- 3. L. SCABRIOR dd. Panicles more than 10 cm. long, the branches usually ascending. e. Spikelets 5 mnm. long. Culms smooth, shining, with a pubes- cent line down one side - 4. L. LUCIDA ee. Spikelets 4 mm. long. f. Ligule 5-8 mm. long; panicle branches few, distant, stiffly spreading or reflexed, the spikelets in clusters at the ends of the branchlets. Blades elliptic-lanceolate, mostly 2-2.5 cm. wide _ - _---- 5. L. LONGILIGULA ff. Ligule 2-5 mm. long; panicle branches slender, ascending, or if spreading, the spikelets not in clusters at the ends of the branchlets. g. Culms glabrous; blades linear or linear-lanceolate, some- times elongate, scabrous; panicles partly included in the sheath or only slightly exserted, the branches finally somewhat spreading - _ __ 6. L. OAXACENSIS gg. Culms sparsely to densely strigose; blades narrowly elliptic-lanceolate, acuminate, softly pubescent on the lower surface; panicles exserted, the branches narrowly ascending or appressed - -- 7. L. STANDLEYI bb. Plants with a strong central cane freely branching, erect or clamber- ing over brush to a height of several meters. c. Branches strongly zigzag; blades glabrous, narrowly lanceolate, mostly less than 1 cm. wide; panicles 5-10 cm. long, few-flowered 8. L. DIVARICATA cc. Branches straight or arcuate; blades usually softly pubescent on the lower surface, at least those on the main branches more than 1.5 cm. wide; primary panicles large, more than 10 cm. long. d. Blades narrowly lanceolate; panicles open, loosely flowered; spikelets 4-5 mm. long - - _ - 9. L. SORGHOIDEA dd. Blades ovate-lanceolate or elliptic, often cordate-clasping at the base, asymmetric; panicles, or at least the branches, compactly flowered; spikelets 3-4 mm. long - - - - 10. L. RUSCIFOLIA
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