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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 hiemata

HABIT Perennial; caespitose; clumped densely. Butt sheaths herbaceous; pallid. Basal innovations intravaginal. Culms erect, or geniculately ascending; 15–60 cm long; 2 -noded. Culm-internodes terete; smooth. Culm-nodes glabrous. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths smooth; glabrous on surface. Ligule a ciliolate membrane; 0.5 mm long; scaberulous on abaxial surface; truncate. Leaf-blades conduplicate, or involute; 5–25 cm long; 1–2 mm wide; light green. Leaf-blade surface scabrous; rough adaxially; glabrous.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth, or scaberulous above.

Panicle open; pyramidal; 5–12 cm long. Primary panicle branches spreading; 1–3 -nate. Panicle branches capillary; scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 5–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus glabrous, or woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 0.9 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume apex acute, or acuminate. Upper glume oblong; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute, or acuminate.

FLORETS Fertile lemma oblong; elliptic in profile; 2–3.5 mm long; membranous; keeled; 5 -veined. Lemma surface pubescent; hairy below; hairy on back. Lemma apex obtuse, or acute. Palea 0.9 length of lemma. Palea keels ciliolate; adorned in the middle. Palea surface pubescent. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 1.5–2 mm long; yellow.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Australasia: Australia.

NOTES Poeae. Vickery.

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