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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 hackelii

HABIT Perennial; caespitose. Culms erect; 80–150 cm long. Culm-nodes glabrous, or pubescent. Leaf-sheaths keeled. Ligule a fringe of hairs. Leaf-blades 16–40 cm long; 4–10 mm wide. Leaf-blade surface glabrous. Leaf-blade apex acute, or acuminate.

INFLORESCENCE Inflorescence a panicle with branches tipped by a raceme.

Panicle open; ovate; 5–20 cm long. Primary panicle branches whorled at most nodes. Panicle branches capillary.

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; flattened; 1.5–2 mm long; 0.33 length of fertile spikelet; ciliate; hairy all along but hairs longer above; with dark brown hairs.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; lanceolate; 5–6 mm long; shorter than fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; 7 -veined; muticous. Companion sterile spikelet lemmas enclosed by glumes; muticous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 5–6 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus cuneate; 0.5–1 mm long; bearded; base obtuse. Spikelet callus hairs dark brown.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; 1 length of spikelet; cartilaginous; without keels; 5–7 -veined. Upper glume oblong; 1-keeled. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 3–8 mm long.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; 4–5 mm long; hyaline; 3 -veined; ciliolate on margins. Fertile lemma oblong; 4–5 mm long; hyaline; without keel; 3 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 20–25 mm long overall; with twisted column. Column of lemma awn 10–12 mm long. Palea absent or minute.

FLOWER Anthers 2–3 mm long.

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. Nair 1993.

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