Digitaria rangelii (Digitaria rangelii)
Description
HABIT Annual;caespitose.Culms decumbent;50–70 cm long;7–9 -noded;rooting from lower nodes.Culm-internodes 6 cm long.Culm-nodes brown;glabrous.Lateral branches ample.Leaf-sheaths 12 cm long;glabrous on surface.Ligule an eciliate membrane;2 mm long.Leaf-blades 10–18 cm long;3–65 mm wide.Leaf-blade surface glabrous.Leaf-blade apex acuminate. INFLORESCENCE Inflorescence composed of racemes.Peduncle 6 cm long. Racemes 12–40;digitate;erect;unilateral;11 cm long.Central inflorescence axis 7–16 cm long.Rhachis angular;0.25 mm wide;scabrous on surface. Spikelets in threes,or clustered at each node.Fertile spikelets pedicelled;3–5 in the cluster.Pedicels linear;unequal;0.8–3 mm long;scaberulous. FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets;1 fertile florets;without rhachilla extension.Spikelets elliptic,or ovate;dorsally compressed;acute;1.2 mm long;0.5 mm wide;falling entire. GLUMES Glumes one the lower absent or obscure;shorter than spikelet;thinner than fertile lemma.Upper glume elliptic,or ovate;0.9–1(–1.2) mm long;0.9 length of spikelet;membranous;without keels;3 -veined.Upper glume surface pubescent;with clavate hairs.Upper glume apex acute. FLORETS Basal sterile florets barren;with palea,or without significant palea.Lemma of lower sterile floret elliptic,or ovate;1.2 mm long;membranous;7 -veined;pubescent;with clavate hairs;acute.Palea of lower sterile floret hyaline;0.2 mm long.Fertile lemma elliptic,or ovate;1.2 mm long;cartilaginous;much thinner on margins;light brown,or dark brown;without keel.Lemma surface papillose and striate;with distinct germination flap.Lemma margins flat;covering most of palea.Lemma apex acute.Palea cartilaginous. FLOWER Lodicules 2;9.2 mm long;membranous;truncate.Anthers 3;0.5 mm long;pallid.Stigmas purple;plumose.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum:
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Class: Liliopsida
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Order: Poales
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Family: Poaceae
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Genus: Digitaria
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