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(Last Modified On 10/16/2012)
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(Last Modified On 10/16/2012)
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Genus
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DIGITARIA
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PlaceOfPublication
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Scop. Fl. Carn. ed. 2. 1:52. 1772.
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Synonym
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Syntherisma Walt. Fl. Carol. 76. 1788.
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Description
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Spikelets solitary, in pairs, or in groups of 3-5, alternate in two rows on one side of a 3-angled, winged or wingless rachis, the first glume turned away from the rachis; first glume wanting, or present as a smaller or minute nerveless scale; second glume from much shorter to as long as the spikelet; sterile lemma as long as or slightly longer than the fruit, 5-nerved, the lateral nerves sometimes approxi- mate near the margin; fruit cartilaginous, pale or dark brown, the hyaline margins of the lemma not inrolled.
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Note
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Annuals or perennials with usually flat blades and slender racemes, digitate or approximate on the common axis.
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Key
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a. Plants annual; culms decumbent-spreading, or if erect, freely branch- ing at the base. b. Culms widely spreading, usually rooting at the lower nodes. c. First glume present, small, nerveless; rachis narrowly winged; second glume distinctly shorter than the fruit. d. Spikelets 3 mm. long, the sterile lemma usually conspicuously villous on the margins; rachis 1 mm. wide, without scattered long white hairs ----- -- - 1. D. SANGUINALIS dd. Spikelets 2 mm. long, the sterile lemma subglabrous or incon- spicuously pilose; rachis about 0.4 mm. wide with a few scat- tered long white hairs ---2. D. HORIZONTALIS cc. First glume wanting; rachis wingless; second glume and sterile lemma equal, longer than the fruit - --3. D. LANUGINOSA bb. Culms erect in small tufts. c. Racemes 10.5-13 cm. long, curved; sheaths papillose or papillose- hirsute; spikelets with no tufts of hairs at the tip -4. D. HIRSUTA cc. Racemes 1-5 cm. long, stiffly ascending; sheaths pubescent or villous; spikelets with a dense tuft of yellowish hairs at the tip-. 5. D. ARGILLACEA aa. Plants perennial; culms erect, simple; racemes appressed or narrowly ascending. b. Second glume nearly as long as the fruit; racemes 1-3, 2.5-7 cm. long; sheaths pilose or hirsute - - _ - _ _ 6. D. SINGULARIS bb. Second glume about one-fourth as long as the fruit, obtuse, some- times shallowly lobed, glabrous; racemes 4-5, about 15 cm. long, brownish from the exposed fruits; sheaths glabrous -7. D. CURTIGLUMA
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