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Descriptions

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

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

Pentameris setifolia

HABIT Perennial; caespitose. Butt sheaths pallid; glossy; glabrous; persistent and investing base of culm; with compacted dead sheaths. Glands absent, or raised crateriform. Culms 15–40 cm long; 3–5 -noded. Leaves mostly basal. Leaf-sheaths glabrous on surface, or hirsute; with simple hairs, or tubercle-based hairs. Leaf-sheath oral hairs bearded. Ligule a fringe of hairs. Leaf-blades curled; filiform; convolute; 30 cm long; 0.8 mm wide; stiff. Leaf-blade surface glabrous, or hirsute; hairy abaxially; with simple hairs, or tubercle-based hairs. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 3–7 cm long; 2–5 cm wide. Panicle branches bearded in axils.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; eglandular, or glandular.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension, or with a barren rhachilla extension. Spikelets cuneate; laterally compressed; 3.5–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; pubescent.

GLUMES Glumes persistent; similar; exceeding apex of florets; shiny; gaping. Lower glume elliptic; 3.5–5 mm long; 1 length of upper glume; membranous; eglandular, or glandular; 1-keeled; 1 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume elliptic; 3.5–5 mm long; 1.2–1.4 length of adjacent fertile lemma; membranous; eglandular, or glandular; 1-keeled; 1 -veined. Upper glume primary vein smooth, or scaberulous. Upper glume lateral veins absent. Upper glume apex obtuse.

FLORETS Fertile lemma oblong; 3–3.5 mm long; membranous; without keel; 5–9 -veined. Lemma surface villous; hairy all along, or below. Lemma apex dentate; 2 -fid; muticous. Palea 0.9 length of lemma. Palea keels puberulous; adorned above. Rhachilla extension 0–0.05 length of fertile floret.

FLOWER Lodicules 2; cuneate; fleshy; glabrous. Anthers 3; 1.6–2 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Africa: south.

NOTES Arundineae. Linder.

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