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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 thailandica
HABIT Perennial; caespitose. Rhizomes elongated. Culms erect, or geniculately ascending; 75–120 cm long; rooting from lower nodes. Culm-internodes distally glabrous. Culm-nodes glabrous. Leaf-sheaths 4–12 cm long; longer than adjacent culm internode; pilose. Ligule an eciliate membrane; 2–6 mm long; entire, or erose. Leaf-blades linear, or lanceolate; 6–20 cm long; 5–15 mm wide; chartaceous; light green. Leaf-blade surface scabrous; rough on both sides. Leaf-blade margins crenate; tuberculate-ciliate; hairy at base. Leaf-blade apex acuminate.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 7–13; borne along a central axis; unilateral; 9–21 cm long. Central inflorescence axis 2.5–6 cm long. Rhachis angular; 0.3–0.5 mm wide; ciliate on margins.
Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels angular; tip cupuliform.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate, or elliptic; dorsally compressed; 3–3.2 mm long; 0.8–0.9 mm wide; falling entire.
GLUMES Glumes one the lower absent or obscure, or two; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 0.25–0.3 mm long; 0.1 length of spikelet; membranous; 0 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume oblong; 0.5–1 mm long; 0.2–0.3 length of spikelet; chartaceous; without keels; 3 -veined. Upper glume surface pubescent; hairy on veins.
FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret elliptic; 1 length of spikelet; chartaceous; 7 -veined; with unevenly spaced veins; pubescent; hairy on veins; acute. Palea of lower sterile floret membranous; 0.6–0.8 mm long. Fertile lemma elliptic; 2.8–3 mm long; cartilaginous; much thinner on margins; dark brown; without keel. Lemma margins flat; covering most of palea. Lemma apex acute. Palea 0.9 length of lemma; cartilaginous.
FLOWER Lodicules 2; 0.3 mm long; truncate. Anthers 3; 1–1.4 mm long; yellow, or brown.
FRUIT Caryopsis ellipsoid; 1.5–1.8 mm long; yellow, or light brown.
DISTRIBUTION Asia-tropical: Indo-China.
NOTES Paniceae. Boonsuk et al 2015.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
