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Descriptions

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

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

Homozeugos gossweileri

HABIT Perennial; caespitose. Butt sheaths persistent and investing base of culm; with compacted dead sheaths. Basal innovations intravaginal. Culms 60–75 cm long; 2 -noded. Culm-nodes bearded. Leaf-sheaths pubescent. Leaf-sheath auricles absent. Ligule an eciliate membrane; 0.5–1 mm long. Leaf-blades filiform; terete; 15–30 cm long; 0.5–1 mm wide.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; 10–12 cm long. Rhachis fragile at the nodes; subterete; glabrous on margins. Rhachis hairs white. Rhachis internodes filiform; 7–8 mm long. Rhachis internode tip oblique; flat.

Spikelets in pairs. Fertile spikelets sessile and pedicelled; 2 in the cluster; subequal. Pedicels filiform; ciliate; with 4–6 mm long hairs; tip oblique.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 13 mm long; falling entire; deciduous from the base, or with accessory branch structures. Spikelet callus cuneate; 3 mm long; pilose; base pungent; attached obliquely.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; 10 mm long; 0.8 length of spikelet; coriaceous; much thinner above; without keels; keel-less except near apex; 7–9 -veined. Lower glume surface villous. Lower glume apex truncate, or obtuse. Upper glume linear; 1 length of spikelet; coriaceous; 3 -veined. Upper glume surface pilose; hairy above. Upper glume margins ciliolate. Upper glume apex obtuse.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret linear; 4 mm long; 0.33 length of spikelet; hyaline; 2 -veined; pubescent; ciliolate on margins; acute. Fertile lemma linear; 5 mm long; hyaline; without keel; 1 -veined. Lemma margins ciliolate. Lemma apex lobed; 2 -fid; with linear lobes; incised 0.33 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 25–30 mm long overall; with twisted column. Column of lemma awn hirtellous. Palea 0.1 length of lemma.

FLOWER Anthers 3.

DISTRIBUTION Africa: southern tropical.

NOTES Andropogoneae. FTA.

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