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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 hookeri

HABIT Perennial; caespitose. Butt sheaths herbaceous; pallid, or light brown. Basal innovations intravaginal. Culms slender; 25–50 cm long; 1–2 -noded. Culm-internodes terete; smooth, or scaberulous. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths antrorsely scabrous; glabrous on surface. Ligule an eciliate membrane; 1–4.5 mm long; glabrous on abaxial surface, or scaberulous on abaxial surface; truncate. Leaf-blades filiform; involute; 5–15 cm long; 1 mm wide; flaccid. Leaf-blade surface scabrous; glabrous, or hispid.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth.

Panicle open; elliptic; 3–10 cm long. Primary panicle branches 1–4 -nate. Panicle branches capillary; scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 4–5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 4–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 0.9 length of upper glume; membranous; 1-keeled; 1–3 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume lateral veins absent, or obscure. Lower glume apex acute. Upper glume oblong; membranous; 1-keeled; 3 -veined. Upper glume primary vein smooth, or scaberulous. Upper glume apex acute.

FLORETS Fertile lemma oblong; dorsally straight along back; elliptic in profile; 2–2.5 mm long; membranous; keeled; 5 -veined. Lemma midvein scabrous; eciliate, or ciliolate; hairy below. Lemma surface puberulous; hairy below; hairy between veins. Lemma margins eciliate, or ciliolate; hairy below. Lemma apex obtuse. Palea 0.9 length of lemma. Palea keels scaberulous; adorned above. Palea surface glabrous, or pubescent; hairy on back. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 1 mm long.

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.