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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Digitaria hentyi

HABIT Perennial; mat forming. Cataphylls evident. Culms decumbent; 30–60 cm long; rooting from lower nodes. Lateral branches ample; intravaginal. Leaf-sheaths glabrous on surface, or pilose; with tubercle-based hairs and reflexed hairs. Leaf-sheath oral hairs scanty. Ligule an eciliate membrane; 1.5–2 mm long; erose. Leaf-blades linear, or lanceolate; 6.8–8.2 cm long; 7–8.5 mm wide; flaccid. Leaf-blade surface smooth, or scaberulous; rough abaxially; pubescent; densely hairy; hairy on both sides. Leaf-blade margins crenate.

INFLORESCENCE Inflorescence composed of racemes. Peduncle 2.6 cm long; glabrous.

Racemes 7; borne along a central axis; ascending; unilateral; 5.5 cm long. Central inflorescence axis 4 cm long. Rhachis wingless; angular; scabrous on margins. Spikelet packing lax.

Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels tip cupuliform.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; 1.9–2.3 mm long; falling entire.

GLUMES Glumes two; dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 0.5 mm long; 0.25 length of spikelet; hyaline; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume oblong; 1.5–1.75 mm long; 0.75–0.8 length of spikelet; membranous; without keels; 3(–5) -veined. Upper glume lateral veins transversely connected at apex. Upper glume surface glabrous. Upper glume apex obtuse.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic; 1 length of spikelet; membranous; 7 -veined; with equidistant veins; without cross-veins; glabrous; obtuse. Fertile lemma elliptic; 1.9–2.3 mm long; cartilaginous; much thinner on margins; yellow; without keel. Lemma margins flat; covering most of palea. Lemma apex apiculate. Palea cartilaginous.

FLOWER Anthers 3; 1 mm long; brown.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Paniceae. Veldkamp 1997.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.