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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 triseta

HABIT Annual; caespitose. Glands elongated. Culms erect; 20–60 cm long; 3–5 -noded. Leaves mostly basal. Leaf-sheaths hirsute. Leaf-sheath oral hairs bearded. Ligule a fringe of hairs. Leaf-blades 8 cm long; 4 mm wide. Leaf-blade surface hirsute. Leaf-blade margins smooth. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle; comprising 5–15 fertile spikelets.

Panicle open; ovate; 7–10 cm long; 3–9 cm wide; bearing few spikelets. Panicle branches bearded in axils.

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

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension, or with a barren rhachilla extension. Spikelets cuneate; laterally compressed; 15–18 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 2.5 mm long; pubescent; pungent.

GLUMES Glumes persistent; similar; exceeding apex of florets; shiny; gaping. Lower glume elliptic; 15–18 mm long; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume surface pilose; hairy on veins; with tubercle-based hairs. Lower glume apex acuminate. Upper glume elliptic; 15–18 mm long; 2–2.5 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume surface pilose; hairy on veins; with tubercle-based hairs. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 6–8 mm long; membranous; without keel; 5–9 -veined. Lemma surface pubescent; hairy above. Lemma apex lobed; 2 -fid; acute; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; 23–35 mm long overall; with twisted column. Lateral lemma awns arising on inner edge of lobes; 12–17 mm long; shorter than principal. Palea 1 length of lemma. Rhachilla extension 0–0.05 length of fertile floret.

FLOWER Lodicules 2; cuneate; fleshy; glabrous. Anthers 3; 3.5 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.