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Descriptions

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

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

Rhytachne furtiva

HABIT Perennial; caespitose. Rhizomes short. Basal innovations intravaginal; flabellate. Culms 60 cm long; 2–3 -noded. Leaf-sheaths keeled. Ligule an eciliate membrane; 1 mm long. Leaf-blades conduplicate; 15–30 cm long; 2–5 mm wide. Leaf-blade surface glabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; smoothly terete; 10–18 cm long. Rhachis fragile at the nodes; semiterete; 3 mm wide; glabrous on surface; glabrous on margins. Rhachis internodes cuneate; 5–7 mm long. Rhachis internode tip transverse; crateriform; with simple rim.

Spikelets squeezed between internode and pedicel (the upper glume peeping through); in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels linear; foliaceous; curved; 5–6 mm long; glabrous.

STERILE SPIKELETS Companion sterile spikelets rudimentary; ovate; 1 mm long; deciduous with the fertile. Companion sterile spikelet glumes chartaceous; obtuse; muticous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or ovate; dorsally compressed; 5–7 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus glabrous; base truncate; with central peg; attached transversely.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; 1 length of spikelet; coriaceous; without keels; winged on margins; winged narrowly; winged above; 9 -veined. Lower glume surface rugose; rough generally, or on flanks. Lower glume apex acute; muticous. Upper glume oblong; membranous; 3 -veined. Upper glume surface rugose; rough in lines (midline). Upper glume muticous.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret ovate; 6 mm long; hyaline; acute. Fertile lemma oblong; 6 mm long; hyaline; without keel; 3 -veined. Lemma apex acute. Palea 1 length of lemma.

FLOWER Lodicules 2; oblong; 0.75 mm long; fleshy; truncate. Anthers 3.

DISTRIBUTION Africa: west tropical.

NOTES Andropogoneae. FWTA.

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