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Descriptions

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

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

Andropogon burmanicus

HABIT Perennial. Culms 100 cm long. Ligule an eciliate membrane. Leaf-blades 20–40 cm long; 1–4 mm wide. Leaf-blade surface pilose.

INFLORESCENCE Inflorescence composed of racemes; terminal.

Racemes 4–5; digitate; erect; 5–6 cm long. Rhachis fragile at the nodes; subterete; ciliate on margins. Rhachis hairs 1.5–2 mm long. Rhachis internodes cuneate; 3 mm long. Rhachis internode tip transverse; crateriform; with hairy rim.

Spikelets squeezed between internode and pedicel; in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels cuneate; 3 mm long; ciliate; hairy all along but hairs longer above (around rim); with 1.5–2 mm long hairs.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; lanceolate; dorsally compressed; 3.5 mm long; shorter than fertile; persistent. Companion sterile spikelet glumes chartaceous; keeled; concave; ciliate on margins; acute; muticous. Companion sterile spikelet lemmas 2; enclosed by glumes.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets linear; dorsally compressed; 4.5 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus pubescent; base obtuse; inserted.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; 1 length of spikelet; coriaceous; 2-keeled; keeled dorsally. Lower glume intercarinal veins absent. Lower glume surface deeply depressed. Upper glume lanceolate; chartaceous; 1-keeled; keeled above. Upper glume awned; 1 -awned. Upper glume awn 3 mm long.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline; 2 -veined. Fertile lemma oblong; 3.5–4 mm long; hyaline; without keel; 1 -veined. Lemma apex lobed; 2 -fid; incised 0.33 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 20 mm long overall; with twisted column. Column of lemma awn glabrous. Palea hyaline; 0 -veined; without keels.

FLOWER Anthers 3; 2.5 mm long.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Andropogoneae. Bor.

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