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Descriptions

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

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

Poa rhadina

HABIT Annual. Butt sheaths herbaceous. Culms erect, or geniculately ascending; slender; 8–16 cm long; 2 -noded. Culm-internodes terete; smooth. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths longer than adjacent culm internode; smooth; glabrous on surface. Ligule an eciliate membrane; 2–3 mm long. Leaf-blades ascending; conduplicate, or convolute; 3–5.5 cm long; 1 mm wide; glaucous. Leaf-blade surface scabrous; rough on both sides. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth.

Panicle open; elliptic, or oblong; 3–6.5 cm long; 1.5–3 cm wide; bearing few spikelets. Primary panicle branches spreading; 2 -nate. Panicle branches smooth, or scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–3(–4) fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 3–3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 2.5–2.75 mm long; 0.9 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume apex acute. Upper glume oblong; 2.75–3 mm long; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma oblong; oblong in profile; 2.25–2.5 mm long; membranous; much thinner above; glandular on surface; keeled; 5 -veined. Lemma midvein ciliate; hairy below. Lemma lateral veins obscure. Lemma margins ciliate. Lemma apex obtuse. Palea 0.9 length of lemma. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 0.5–0.6 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-tropical: India.

NOTES Poeae. Bor.

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