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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 resinulosa

HABIT Perennial; caespitose. Butt sheaths thickened and forming a bulb. Basal innovations intravaginal. Culms erect; 15–30 cm long; 1 -noded. Culm-internodes antrorsely scabrous. Leaf-sheaths smooth. Ligule an eciliate membrane; 1.5–4 mm long; truncate. Leaf-blades straight, or curved; filiform; conduplicate, or convolute; 10–25 cm long; 0.5–1 mm wide. Leaf-blade surface smooth, or scabrous. Leaf-blade apex pungent.

INFLORESCENCE Dioecious. Inflorescence a panicle.

Panicle contracted; oblong; 5–10 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 3–6 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 4.5–7.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus woolly. Floret callus hairs 0.5 length of lemma.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 3–4 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; 3.5–4.5 mm long; 0.9–1 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; 3.5–5 mm long; membranous; keeled; 5 -veined. Lemma midvein ciliate; hairy below. Lemma surface scabrous; rough above; pubescent; hairy below; hairy on veins. Lemma margins ciliate; hairy below. Lemma apex acute. Palea keels scabrous; adorned in the middle. Palea surface glabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 1.7–3 mm long.

FRUIT Caryopsis with adherent pericarp; fusiform; trigonous; 1.5–2.5 mm long. Hilum punctiform.

MALE Male inflorescence similar to female. Male spikelets resembling female; 5–7 flowered; 4–4.5 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.