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Descriptions

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

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

Saccharum longisetosum

HABIT Perennial; caespitose. Rhizomes elongated. Culms erect; robust; 200–250 cm long. Culm-internodes solid. Leaf-sheaths pilose; with tubercle-based hairs. Ligule a ciliolate membrane. Leaf-blades 30–100 cm long; 7–15 mm wide. Leaf-blade surface smooth; glabrous, or puberulous. Leaf-blade margins scabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle with branches tipped by a raceme. Peduncle glabrous.

Panicle open; elliptic; dense; 15–45 cm long.

Rhachis fragile at the nodes; subterete; villous on surface. Rhachis hairs tawny; 3–8 mm long. Rhachis internodes linear.

Spikelets in pairs. Fertile spikelets sessile and pedicelled; 2 in the cluster; heteromorphic (pedicelled spikelet villous); subequal. Pedicels linear; villous; with tawny hairs; with 3–8 mm long hairs.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate, or oblong; dorsally compressed; 4.5–5 mm long; falling entire; deciduous from the base, or with accessory branch structures. Spikelet callus bearded; base truncate. Spikelet callus hairs tawny; 8 mm long; 2 length of spikelet.

GLUMES Glumes dissimilar; firmer than fertile lemma. Lower glume lanceolate; 1 length of spikelet; chartaceous; much thinner above; 2-keeled; 2–6 -veined. Lower glume surface flat; glabrous (sessile), or villous (pedicelled); hairy below. Lower glume apex emarginate, or truncate. Upper glume lanceolate; 1 length of spikelet; chartaceous; much thinner above; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume margins ciliate. Upper glume apex acuminate.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline; ciliolate on margins; acute. Fertile lemma linear; 3.5 mm long; hyaline. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; 10–20 mm long overall. Palea absent or minute.

FLOWER Lodicules 2; cuneate; ciliate. Anthers 3.

DISTRIBUTION Asia-temperate: China. Asia-tropical: India and Indo-China.

NOTES Andropogoneae. Fl Assam 1993.

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