GrassBase - The Online World Grass Flora


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

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

Apocopis cochinchinensis

HABIT Annual. Culms erect; slender; 20–40 cm long. Leaf-sheaths keeled; pilose; with tubercle-based hairs. Ligule an eciliate membrane; 0.5–1 mm long; lacerate. Leaf-blades 2–4 cm long; 2–4 mm wide. Leaf-blade midrib keeled beneath. Leaf-blade surface glabrous, or pilose; hairy abaxially; with tubercle-based hairs. Leaf-blade margins ciliate; hairy at base. Leaf-blade apex acute.

INFLORESCENCE Inflorescence composed of racemes. Peduncle glabrous.

Racemes 2; paired; 1–2 cm long. Rhachis fragile at the nodes; subterete; ciliate on margins. Rhachis hairs yellow; 1.75 mm long. Rhachis internodes linear; 1.75 mm long.

Spikelets appressed; in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels adnate at the base to lower glume of sessile spikelet; linear; 1.75 mm long; ciliate; with 2–2.5 mm long hairs.

STERILE SPIKELETS Companion sterile spikelets represented by barren pedicels.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; truncate; 4.5–5 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus base obtuse; attached transversely.

GLUMES Glumes dissimilar; reaching apex of florets; firmer than fertile lemma. Lower glume lanceolate, or elliptic; 0.66 length of spikelet; coriaceous; much thinner above; much thinner on margins; yellow; without keels; 7 -veined. Lower glume primary vein extending to apex, or falling short of apex. Lower glume lateral veins all falling short of apex. Lower glume apex erose; emarginate. Upper glume oblong; 1 length of spikelet; chartaceous; yellow; 3 -veined. Upper glume lateral veins all falling short of apex. Upper glume apex truncate.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret lanceolate, or oblong; 3.5 mm long; hyaline; 0 -veined; without midvein; without lateral veins. Fertile lemma oblong; 4 mm long; hyaline; without keel; 1 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 20 mm long overall; with twisted column. Column of lemma awn 10 mm long; hispidulous. Palea 4 mm long; hyaline; 0 -veined; without keels.

FLOWER Lodicules absent. Anthers 2; 2–2.5 mm long.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Andropogoneae. Bor 1992.

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