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Descriptions

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

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

Chrysopogon perlaxus

HABIT Perennial. Culms erect; 100–150 cm long. Leaves mostly basal. Leaf-sheaths keeled. Ligule a fringe of hairs. Leaf-blades 10–25 cm long; 4–8 mm wide. Leaf-blade surface scaberulous; rough adaxially; puberulous; hairy adaxially. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle with branches tipped by a raceme.

Panicle open; ovate; 12–15 cm long. Primary panicle branches whorled at most nodes; 5–10 cm long. Panicle branches capillary; flexuous; apically expanded; scaberulous; villous (rufously); hairy at tip.

Racemes bearing a triad of spikelets; 1 fertile spikelets on each. Rhachis obsolete.

Spikelets in threes. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 2 in the cluster. Pedicels linear; 1.5 mm long; 0.2 length of fertile spikelet; villous; hairy all along but hairs longer above; with red hairs.

STERILE SPIKELETS Companion sterile spikelets well-developed; containing empty lemmas; elliptic, or oblong; 6–7 mm long; as long as fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; awned; one glume awned; with 7–8 mm long awn. Companion sterile spikelet lemmas 2; enclosed by glumes; muticous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 7 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus cuneate; pilose; base pungent; attached obliquely. Spikelet callus hairs red.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; 7 mm long; 1 length of spikelet; cartilaginous; without keels; keel-less except near apex. Upper glume lanceolate; 1-keeled. Upper glume awned; 1 -awned. Upper glume awn 8–10 mm long.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 5 mm long; hyaline; 2 -veined. Fertile lemma linear; hyaline; without keel. Lemma apex entire; awned; 1 -awned. Principal lemma awn geniculate; 33 mm long overall; with twisted column. Column of lemma awn 15 mm long; pubescent. Palea absent or minute.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Andropogoneae. Bor 1993.

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