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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 veneta

HABIT Perennial; caespitose. Butt sheaths pallid; glossy; glabrous; persistent and investing base of culm. Glands raised crateriform. Culms 20–40 cm long; 3–6 -noded. Culm-nodes bearded. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths hirsute; with tubercle-based hairs. Leaf-sheath oral hairs bearded. Ligule a fringe of hairs. Leaf-blades 10 cm long; 4 mm wide; flaccid; glandular. Leaf-blade surface pilose; hairy adaxially; with simple hairs. Leaf-blade margins glandular; smooth. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle; comprising 100 fertile spikelets.

Panicle open; ovate; 3–8 cm long; 2–5 cm wide.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; 1.5 length of fertile spikelet; glandular; scaberulous.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets cuneate; laterally compressed; 5–6.5 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; 5–6.5 mm long; 1 length of upper glume; membranous; glandular; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface smooth, or asperulous. Lower glume apex acuminate. Upper glume elliptic; 5–6.5 mm long; 2 length of adjacent fertile lemma; membranous; glandular; 1-keeled; 1 -veined. Upper glume primary vein smooth, or scaberulous. Upper glume lateral veins absent. Upper glume surface smooth, or asperulous. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 2.8–3 mm long; membranous; without keel; 5–9 -veined. Lemma surface villous. Lemma apex lobed; 2 -fid; with lobes 0.6 mm long; incised 0.2 of lemma length; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; 8–10 mm long overall; with twisted column. Lateral lemma awns arising on inner edge of lobes; 2–3.5 mm long; equalling glumes; shorter than principal. Palea surface glabrous.

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

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.