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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 acicularifolia

HABIT Perennial. Rhizomes short; woody. Basal innovations intravaginal. Culms 10–20 cm long. Lateral branches lacking. Leaf-sheaths wider than blade at the collar; smooth; glabrous on surface. Ligule an eciliate membrane; 1–5 mm long; acute. Collar with external ligule. Leaf-blades deciduous at the ligule; convolute; 0.5–2.5 cm long; 0.5 mm wide. Leaf-blade surface smooth; glabrous. Leaf-blade apex abruptly acute.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; effuse; 1.5–3.5 cm long. Primary panicle branches bearing 1–2 fertile spikelets on each lower branch. Panicle axis glabrous. Panicle branches capillary; smooth, or scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 4–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.5–1 mm long; pubescent. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 2–3.5 mm long; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume apex obtuse. Upper glume ovate; 2–3.5 mm long; 0.66–0.8 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume margins smooth, or scaberulous. Upper glume apex obtuse.

FLORETS Fertile lemma oblong; elliptic in profile; 3–4 mm long; membranous; keeled; 5 -veined. Lemma midvein scabrous. Lemma surface pubescent; hairy below. Lemma margins scabrous. Lemma apex obtuse. Palea 2.5–3.5 mm long. Palea keels ciliolate; adorned in the middle. Palea surface pubescent; hairy below. Rhachilla extension 1–2 mm long.

FLOWER Lodicules 2; 0.5 mm long; membranous. Anthers 3; 1.8–3 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Australasia: New Zealand.

NOTES Poeae. Edgar 1995.

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