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Descriptions

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

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

Pseudodichanthium serrafalcoides

HABIT Annual. Culms 30–90 cm long; rooting from lower nodes. Ligule a ciliolate membrane; 1 mm long. Leaf-blades 5–15 cm long; 4–6 mm wide. Leaf-blade surface scabrous. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence composed of racemes. Peduncle flexuous.

Racemes 1; single; oblong; arcuate; unilateral; 1.5–4 cm long. Rhachis fragile at the nodes; angular; ciliate on margins. Rhachis internodes cuneate. Rhachis internode tip oblique; cupuliform.

Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels cuneate; flattened; 2 mm long; ciliate; tip cupuliform; toothed.

STERILE SPIKELETS Basal sterile spikelets well-developed; 4–6 in number; barren; elliptic; 8–9 mm long; larger than fertile. Basal sterile spikelet glumes chartaceous (winged).

Companion sterile spikelets well-developed; containing empty lemmas; elliptic; asymmetrical; dorsally compressed; 10 mm long; longer than fertile; deciduous with the fertile. Companion sterile spikelet glumes chartaceous; winged on margins; distinctly veined; acute. Companion sterile spikelet lemmas 1; enclosed by glumes.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 6.5–7 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus base obtuse; inserted.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume elliptic; asymmetrical; 6.5–7 mm long; 1 length of spikelet; chartaceous; without keels; winged on margins; winged broadly; winged all along. Lower glume apex emarginate. Upper glume elliptic; 6 mm long; chartaceous; without keels; 3 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic; 3.5 mm long; hyaline; 0 -veined; without midvein; without lateral veins. Fertile lemma linear; hyaline; without keel; 1 -veined. Lemma apex awned; 1 -awned. Principal lemma awn apical; geniculate; 35 mm long overall; with twisted column. Column of lemma awn 15 mm long; glabrous. Palea absent or minute.

DISTRIBUTION Asia-temperate: Arabia. Asia-tropical: India.

NOTES Andropogoneae. Bor.

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