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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 glaberrima
HABIT Perennial; caespitose. Butt sheaths withering. Culms erect; 12–23 cm long. Lateral branches lacking. Leaf-sheaths without keel; glabrous on surface. Ligule an eciliate membrane; 2–3 mm long; obtuse. Leaf-blades flat, or conduplicate; 2–4 cm long; 2–3 mm wide. Leaf-blade surface smooth. Leaf-blade margins scaberulous. Leaf-blade apex abruptly acute.
INFLORESCENCE Inflorescence a panicle.
Panicle open; ovate; 5–8 cm long. Panicle branches scaberulous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels smooth, or scaberulous.
FERTILE SPIKELETS Spikelets comprising 3 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 5.5–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.
GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 3–3.5 mm long; 0.66 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 4–4.6 mm long; 0.75 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.
FLORETS Fertile lemma ovate; elliptic in profile; 4.3–5 mm long; coriaceous; keeled; 5 -veined. Lemma midvein ciliolate. Lemma surface scabrous; rough between veins. Lemma apex acute. Palea keels scaberulous; adorned above.
FLOWER Lodicules 2; membranous. Anthers 3; 2.6–3 mm long.
FRUIT Caryopsis with adherent pericarp. Hilum punctiform.
DISTRIBUTION South America: western South America.
NOTES Poeae. Tovar 1995.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.