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Descriptions

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

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

Pogonatherum rufobarbatum

HABIT Perennial; mat forming. Culms rambling; 25–60 cm long. Leaf-sheath auricles erect. Ligule an eciliate membrane; 1 mm long. Leaf-blades lanceolate; 5–10 cm long; 3–6 mm wide.

INFLORESCENCE Inflorescence composed of racemes; terminal and axillary. Axillary inflorescences present throughout the plant; similar to terminal. Peduncle flexuous.

Racemes 1; single; straight, or arcuate; 2.5–6 cm long. Rhachis fragile at the nodes; subterete; villous on margins. Rhachis internodes linear; 2.5 mm long; 0.66 length of fertile spikelet.

Spikelets in pairs. Fertile spikelets sessile and pedicelled; 2 in the cluster. Pedicels filiform; 2 mm long; villous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 3.2–3.5 mm long; falling entire; deciduous from the base and with accessory branch structures. Spikelet callus pubescent; base obtuse; attached transversely. Spikelet callus hairs white.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; 0.9 length of spikelet; cartilaginous; without keels; 3–7 -veined. Lower glume surface pubescent. Lower glume apex lobed; 2 -fid. Upper glume oblong; 1 length of spikelet; cartilaginous; 1-keeled. Upper glume surface pilose; hairy above. Upper glume apex dentate; 2 -fid; awned; 1 -awned. Upper glume awn 1.5 mm long.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret lanceolate; hyaline; 0 -veined; without midvein; without lateral veins; acute. Fertile lemma lanceolate; 3 mm long; hyaline; without keel; 1 -veined. Lemma apex lobed; 2 -fid; incised 0.33–0.5 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 17–20 mm long overall; with twisted column. Palea 1 length of lemma; hyaline; without keels.

FLOWER Lodicules absent. Anthers 2; 2.5–3 mm long.

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. Bor.

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