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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 poiformis

HABIT Perennial; caespitose; clumped densely. Butt sheaths herbaceous; pallid. Basal innovations intravaginal. Culms erect; 20–90 cm long. Culm-internodes terete; smooth. Lateral branches lacking. Leaf-sheaths tight; smooth; glabrous on surface. Ligule a ciliolate membrane; 0.25–1.25 mm long; pubescent on abaxial surface; truncate. Leaf-blades aciculate; convolute; 20–50 cm long; 1–2 mm wide; stiff. Leaf-blade surface scabrous; rough adaxially; glabrous.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth.

Panicle contracted; linear; 8–30 cm long; 1–6 cm wide. Primary panicle branches 2–7 -nate; bearing spikelets almost to the base. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5–7 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 2–7 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 6–10 mm long; 5–7 mm wide; 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; 3–5 mm long; 0.9 length of upper glume; membranous; 1-keeled; (1–)3 -veined. Lower glume primary vein scabrous. Lower glume apex acute, or acuminate. Upper glume oblong; 3–5 mm long; 0.66–0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute, or acuminate.

FLORETS Fertile lemma oblong; elliptic in profile; 3–6 mm long; membranous; much thinner above; much thinner on margins; keeled; 5(–7) -veined. Lemma midvein scaberulous; ciliate; hairy below. Lemma surface smooth, or scaberulous; glabrous. Lemma margins ciliate; hairy at base. Lemma apex truncate, or obtuse, or acute. Palea 0.9 length of lemma. Palea keels scabrous; adorned above. Palea surface smooth, or scabrous; glabrous, or pubescent; hairy on back. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 1.7–3 mm long; yellow.

FRUIT Caryopsis with adherent pericarp; oblong; 1.8 mm long. Hilum punctiform.

DISTRIBUTION Australasia: Australia.

NOTES Poeae. Vickery.

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