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Project Name Data (Last Modified On 10/16/2012)
 

Flora Data (Last Modified On 10/16/2012)
Genus DIGITARIA
PlaceOfPublication Scop. Fl. Carn. ed. 2. 1:52. 1772.
Synonym Syntherisma Walt. Fl. Carol. 76. 1788.
Description 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.
Note Annuals or perennials with usually flat blades and slender racemes, digitate or approximate on the common axis.
Key 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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