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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 hachadoensis

HABIT Perennial; caespitose. Culms erect; 20–50 cm long. Culm-internodes smooth. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths keeled; glabrous on surface. Ligule an eciliate membrane; 1.5–3 mm long; obtuse. Leaf-blades conduplicate; 4–10 cm long; 2–3 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous. Leaf-blade apex obtuse; hooded.

INFLORESCENCE Inflorescence a panicle; exserted, or embraced at base by subtending leaf.

Panicle open; elliptic; nodding; 6–10 cm long. Primary panicle branches 2–4 -nate; 3–6 cm long. Panicle branches flexuous; scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 6–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 4–5 mm long; 0.75 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume surface scabrous; rough on veins. Lower glume apex acute. Upper glume ovate; 4.5–6 mm long; 0.75 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface asperulous; rough on veins. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; elliptic in profile; 5.5–6.7 mm long; membranous; much thinner on margins; keeled; 5 -veined. Lemma lateral veins prominent. Lemma surface scabrous; pubescent; hairy on veins; with basal hair tufts near margin; bearing 2 hair tufts in all. Lemma apex emarginate. Palea 4–5 mm long. Palea keels scabrous; adorned above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 0.8–1.2 mm long.

FRUIT Caryopsis with adherent pericarp; 2–2.5 mm long. Hilum punctiform.

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.