GrassBase - The Online World Grass Flora


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

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

Poa amplexicaulis

HABIT Perennial; caespitose. Stolons present. Butt sheaths red; glossy; glabrous. Basal innovations intravaginal. Culms 14–40 cm long. Culm-internodes terete; distally glabrous. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths tubular for much of their length; with 1 of their length closed; smooth; glabrous on surface. Ligule an eciliate membrane; 0.8–2.6 mm long; pubescent on abaxial surface; truncate. Leaf-blades conduplicate; 4–11.5 cm long; 0.2–0.9(–1.3) mm wide. Leaf-blade surface scaberulous; rough adaxially. Leaf-blade apex abruptly acute; hooded, or simple.

INFLORESCENCE Inflorescence a panicle.

Panicle open; linear; 3.5–10 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–7 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 2.8–6.2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 1.5–2.1 mm long; 0.9 length of upper glume; membranous; 1-keeled; 1–3 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent, or obscure. Lower glume surface smooth, or asperulous; rough above. Lower glume apex acute. Upper glume oblong; 1.7–2.8 mm long; 0.5–0.66 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scaberulous. Upper glume surface smooth, or asperulous; rough above. Upper glume apex acute.

FLORETS Fertile lemma ovate; elliptic in profile; 2.3–3 mm long; membranous; keeled; 5 -veined. Lemma midvein eciliate, or ciliolate; hairy below. Lemma lateral veins obscure. Lemma surface scaberulous; rough above and on veins; glabrous, or puberulous; hairy below; hairy on veins. Lemma apex obtuse, or acute. Palea keels ciliolate; adorned below. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 1.4–1.8 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Australasia: Australia.

NOTES Poeae. Weiler & Stajsic 2007.

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