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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 jugicola

HABIT Perennial; caespitose; clumped loosely, or moderately, or densely. Rhizomes elongated. Stolons present. Butt sheaths pallid; dull, or glossy; glabrous, or pubescent. Culms geniculately ascending; slender; 45–90 cm long; 2 -noded. Culm-internodes terete. Culm-nodes glabrous. Leaves mostly basal. Leaf-sheaths glabrous on surface to pubescent. Ligule a ciliolate membrane; 0.5–2 mm long; pubescent on abaxial surface; truncate, or obtuse. Leaf-blades involute; 15–35 cm long; 1–2 mm wide. Leaf-blade surface glabrous, or pilose; sparsely hairy. Leaf-blade apex abruptly acute; hooded; antrorsely scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; elliptic; 10–25 cm long. Panicle axis angular; scabrous. Panicle branches capillary; scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 2–5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 4–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous, or woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3 mm long; 1 length of upper glume; membranous; much thinner on margins; 1-keeled; 1–3 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent, or obscure. Lower glume surface smooth, or asperulous. Lower glume apex acute. Upper glume lanceolate; 3 mm long; 0.66–0.9 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface smooth, or asperulous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate, or oblong; 3.5–4.5 mm long; membranous; keeled; 5 -veined. Lemma midvein scaberulous; ciliate; hairy below. Lemma surface smooth, or scaberulous; rough above. Lemma margins ciliate; hairy below. Lemma apex obtuse. Palea keels scabrous; adorned above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 2.5 mm long; yellow, or purple.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Australasia: Australia.

NOTES Poeae. Morris 1997.

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