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Descriptions

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

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

Hemisorghum mekongense

HABIT Perennial; caespitose. Culms erect; 5–10 mm diam. Culm-internodes solid. Ligule a ciliolate membrane. Leaf-blades flat; 30–40 cm long; 30–40 mm wide.

INFLORESCENCE Inflorescence a panicle with branches tipped by a raceme.

Panicle open; elliptic; 30–50 cm long. Primary panicle branches whorled at most nodes.

Racemes 2–6 cm long; bearing few fertile spikelets; bearing 3–7 fertile spikelets on each. Rhachis fragile at the nodes; angular; scabrous on margins; glabrous on margins. Rhachis internodes filiform.

Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels filiform; angular; scabrous; glabrous.

STERILE SPIKELETS Companion sterile spikelets well-developed; comprising 2 subequal glumes without lemmas; lanceolate; dorsally compressed; shorter than fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; muticous.

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

GLUMES Glumes dissimilar; firmer than fertile lemma. Lower glume lanceolate; 1 length of spikelet; coriaceous; 2-keeled. Lower glume primary vein scabrous. Lower glume intercarinal veins distinct. Lower glume surface flat; glabrous, or pilose. Lower glume apex obtuse.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; 0.9 length of spikelet; membranous; 2 -veined; ciliolate on margins. Fertile lemma elliptic; 3.5–4 mm long; hyaline; without keel; 1 -veined. Lemma margins ciliolate. Lemma apex entire, or dentate; 2 -fid; muticous. Palea 1 length of lemma; hyaline; 0 -veined; without keels.

FLOWER Lodicules 2; cuneate; fleshy; glabrous.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Andropogoneae. WDC.

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