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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Digitaria rangelii
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.
DISTRIBUTION South America: western South America.
NOTES Paniceae. Gir.-Canas 2012.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
