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Descriptions

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

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

Pogonachne racemosa

HABIT Annual. Culms 60–100 cm long; rooting from lower nodes. Ligule an eciliate membrane; 3 mm long; lacerate. Leaf-blades 12–25 cm long; 10–15 mm wide. Leaf-blade surface pilose; hairy on both sides; with tubercle-based hairs. Leaf-blade margins scabrous.

INFLORESCENCE Synflorescence compound; scanty. Inflorescence composed of racemes; terminal and axillary; subtended by a spatheole. Spatheole linear; 6–12 cm long; herbaceous.

Racemes 1; single; 4–6 cm long. Rhachis fragile at the nodes; flattened; ciliate on margins. Rhachis internodes linear; 4 mm long.

Spikelets solitary, or in pairs. Fertile spikelets pedicelled; 1 in the cluster. Companion sterile spikelets sessile; 0–1 in the cluster. Pedicels cuneate; flattened; 2.5–3 mm long; ciliate; tip cupuliform.

STERILE SPIKELETS Companion sterile spikelets absent, or represented by single glumes; linear; 0.5 mm long; shorter than fertile; persistent.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; gibbous; 10 mm long; falling entire; deciduous from the base. Spikelet callus cuneate; 1 mm long; bearded; base truncate. Spikelet callus hairs 0.4 length of spikelet.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume ovate; 1 length of spikelet; coriaceous; without keels; 7 -veined. Lower glume surface pilose. Lower glume apex acute. Upper glume ovate; gibbous; coriaceous; with membranous margins; without keels; keel-less except near apex; 5 -veined. Upper glume surface pilose; with a dorsal tuft of hair. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret lanceolate; hyaline; 3 -veined. Fertile lemma oblong; 5–6 mm long; hyaline; without keel; 3 -veined. Lemma apex dentate; 2 -fid; obtuse; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 30–40 mm long overall; with twisted column. Column of lemma awn glabrous. Palea 0.8 length of lemma; 2 -veined; without keels.

FLOWER Lodicules 2; 2 mm long. Anthers 3.

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. Bor.

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