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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 arechavaletae

HABIT Perennial. Rhizomes elongated. Culms erect; 70 cm long; 2–3 -noded. Culm-internodes elliptical in section. Leaf-sheaths longer than adjacent culm internode; scaberulous; glabrous on surface. Ligule an eciliate membrane; 1–2 mm long; entire; truncate. Leaf-blades conduplicate, or convolute; 20–25 cm long; 5–6 mm wide. Leaf-blade surface scaberulous; rough adaxially; glabrous.

INFLORESCENCE Dioecious. Inflorescence a panicle.

Panicle open; oblong; 15 cm long; 4–5 cm wide; contracted about primary branches. Primary panicle branches ascending; 4–9 cm long; naked below, or bearing spikelets almost to the base.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5–1 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 3 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume linear; 4 mm long; 0.9 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume apex acuminate. Upper glume linear; 4.5 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acuminate.

FLORETS Fertile florets female. Fertile lemma lanceolate; 4.5 mm long; membranous; keeled; 5 -veined. Lemma midvein scabrous; ciliolate; hairy below. Lemma lateral veins distinct. Lemma margins pubescent. Lemma apex acute. Palea 3 mm long; 2 -veined. Palea keels scaberulous; eciliate, or ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3.

FRUIT Caryopsis with adherent pericarp; fusiform; 1.8 mm long. Hilum punctiform.

MALE Male inflorescence similar to female. Male spikelets resembling female.

DISTRIBUTION South America: southern South America.

NOTES Poeae. Parodi 1996.

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