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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 denticulata

HABIT Perennial; caespitose; clumped loosely. Basal innovations extravaginal. Culms decumbent; 15–25 cm long; 2 -noded; with 0.25–0.33 of their length below uppermost node. Culm-internodes elliptical in section; distally glabrous. Leaf-sheaths mostly shorter than adjacent culm internode; glabrous on surface. Ligule an eciliate membrane; 1.5 mm long; obtuse. Leaf-blades flat, or conduplicate; 6–8 cm long; 2–3 mm wide. Leaf-blade surface scaberulous. Leaf-blade margins smooth, or scaberulous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 4–8 cm long. Panicle axis smooth. Panicle branches capillary; smooth.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1–2 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus woolly. Floret callus hairs 0.33 length of lemma.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2 mm long; 0.8 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 2.5 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume surface smooth. Upper glume apex entire, or erose; obtuse.

FLORETS Fertile lemma ovate; ovate in profile; 2.5–3 mm long; membranous; keeled; 5 -veined. Lemma midvein pubescent; hairy below. Lemma lateral veins obscure. Lemma surface scabrous; rough between veins; glabrous, or pubescent; hairy below; hairy on veins. Lemma apex erose, or dentate; obtuse. Palea 1 length of lemma. Palea keels scaberulous; ciliolate; adorned in the middle. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 2.5 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION South America: western South America.

NOTES Poeae. Hackel 2001.

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