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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 myriantha

HABIT Perennial; caespitose. Culms erect; 160 cm long; 20 -noded. Culm-internodes terete; smooth. Leaves cauline. Leaf-sheaths keeled; antrorsely scabrous. Ligule an eciliate membrane; 1 mm long; obtuse. Leaf-blades 20–35 cm long; 4–8 mm wide; flaccid. Leaf-blade surface scabrous; rough on both sides. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 25–35 cm long; 15–20 cm wide. Primary panicle branches 7–9 -nate; 15–30 cm long. Panicle axis 6 noded; scabrous. Panicle branches capillary; tangled; scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 5–7 fertile florets; with diminished florets at the apex. Spikelets ovate, or orbicular; laterally compressed; compressed strongly; 4 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.5 mm long; smooth. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2.5 mm long; 0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 3 mm long; 0.66–0.75 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scaberulous. Upper glume surface asperulous; rough on veins. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; elliptic in profile; 3.5 mm long; membranous; keeled; 5 -veined. Lemma midvein scaberulous; ciliate; hairy below. Lemma lateral veins prominent. Lemma surface scabrous; rough below; pubescent; hairy on veins. Lemma apex acuminate. Palea 0.75 length of lemma. Palea keels scabrous; adorned above. Apical sterile florets resembling fertile though underdeveloped.

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

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION South America: western South America and southern South America.

NOTES Poeae. Hackel 1995.

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