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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 denudata

HABIT Perennial. Rhizomes elongated. Basal innovations extravaginal and intravaginal. Culms 20–70 cm long; 2–4 -noded. Leaf-sheaths longer than adjacent culm internode; smooth, or antrorsely scabrous. Ligule an eciliate membrane; 2–6 mm long; 0.5–1 mm long on basal shoots; acute. Leaf-blades flat, or conduplicate; 4–20 cm long; 2–6 mm wide. Leaf-blade surface scabrous; rough adaxially, or on both sides. Leaf-blade apex attenuate.

INFLORESCENCE Dioecious. Inflorescence a panicle.

Panicle contracted; oblong; 6–20 cm long. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 5–6 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 5.5–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus woolly. Floret callus hairs 1 length of lemma.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 3–4.5 mm long; 1 length of upper glume; membranous; 1-keeled; 1–3 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent, or distinct. Lower glume apex acute. Upper glume ovate; 3.5–5 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile florets female. Fertile lemma ovate; elliptic in profile; 4–6 mm long; membranous; much thinner on margins; keeled; 5 -veined. Lemma midvein ciliate; hairy below. Lemma surface pubescent; hairy on veins. Lemma margins ciliate; hairy at base. Lemma apex acute. Palea keels ciliolate; adorned above. Apical sterile florets resembling fertile though underdeveloped.

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

FRUIT Caryopsis with adherent pericarp; fusiform; trigonous; 1.5 mm long. Hilum punctiform.

MALE Male inflorescence similar to female. Male spikelets resembling female; 4–8 flowered; 4–7 mm long.

DISTRIBUTION South America: southern South America.

NOTES Poeae. Fl Pat 1995.

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