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Descriptions

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

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

Trachypogon chevalieri

HABIT Perennial; caespitose. Culms 30–100 cm long. Culm-nodes bearded. Ligule an eciliate membrane. Leaf-blades linear; flat; 5–20 cm long; 1–4 mm wide.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; straight, or flexuous; 2–8 cm long. Rhachis tough; subterete. Rhachis internodes linear; 4 mm long. Rhachis internode tip oblique; flat.

Spikelets in pairs. Fertile spikelets pedicelled; 1–2 in the cluster; on longer pedicels than sterile. Companion sterile spikelets pedicelled; 0–1 in the cluster. Pedicels linear; tip oblique.

STERILE SPIKELETS Companion sterile spikelets well-developed; containing empty lemmas, or male; linear; subterete; 4–10 mm long; shorter than fertile; persistent. Companion sterile spikelet glumes coriaceous; inconspicuously veined; truncate. Companion sterile spikelet lemmas 2; enclosed by glumes; muticous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 7–9 mm long; falling entire; deciduous from the base, or with accessory branch structures. Spikelet callus linear; 2–3 mm long; bearded; base pungent; attached obliquely. Spikelet callus hairs yellow.

GLUMES Glumes dissimilar; firmer than fertile lemma; dull, or shiny. Lower glume oblong; 1 length of spikelet; coriaceous; grey to dark brown; without keels; 7–9 -veined. Lower glume surface glabrous, or pubescent.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; 0.9 length of spikelet; hyaline; 2 -veined; ciliate on margins; obtuse. Fertile lemma linear; 0.5 mm long; hyaline; without keel; 3 -veined. Lemma apex entire; acute; awned; 1 -awned. Principal lemma awn apical; geniculate; 30–70 mm long overall; with twisted column. Column of lemma awn pubescent. Palea absent or minute.

DISTRIBUTION Africa: west tropical, west-central tropical, east tropical, and southern tropical.

NOTES Andropogoneae. FTEA.

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