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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 madecassa
HABIT Perennial. Stolons present. Culms erect; 15–60 cm long. Lateral branches lacking. Ligule an eciliate membrane; 2.5–3 mm long. Leaf-blades flat, or involute; 4–10 cm long; 1–1.5 mm wide. Leaf-blade surface smooth; glabrous.
INFLORESCENCE Inflorescence a panicle.
Panicle open; ovate; 4–20 cm long; contracted about primary branches. Primary panicle branches ascending; 1–2 -nate; 2–12 cm long.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 2 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus woolly.
GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2.5–3 mm long; 0.8 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein scaberulous. Lower glume apex acute. Upper glume lanceolate; 3–4 mm long; 0.66 length of adjacent fertile lemma; membranous; 1-keeled; 3–5 -veined. Upper glume apex acute.
FLORETS Fertile lemma lanceolate; 4.5–6 mm long; membranous; keeled; 5–7 -veined. Lemma apex acute. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 2; membranous. Anthers 3.
FRUIT Caryopsis with adherent pericarp. Hilum punctiform.
DISTRIBUTION Africa: western Indian ocean.
NOTES Poeae. Gr Madag 1997.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.