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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Isachne rigidifolia
HABIT Perennial. Stolons present. Culms rambling; 15–40 cm long. Lateral branches ample. Leaves distichous. Leaf-sheaths longer than adjacent culm internode; glabrous on surface; outer margin hairy. Ligule a ciliate membrane. Leaf-blades lanceolate; 2–4 cm long; 2–4 mm wide; coriaceous; stiff. Leaf-blade midrib conspicuous. Leaf-blade margins cartilaginous. Leaf-blade apex pungent.
INFLORESCENCE Inflorescence a panicle.
Panicle open; oblong; 2–5 cm long. Primary panicle branches ascending, or spreading. Panicle branches stiff.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–2 mm long.
FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets orbicular; tilted on the pedicel; dorsally compressed; 2 mm long; breaking up at maturity; disarticulating above glumes but not between florets.
GLUMES Glumes deciduous; similar; shorter than spikelet; thinner than fertile lemma. Lower glume oblong; 0.9 length of spikelet; membranous; without keels; 5 -veined. Lower glume surface glabrous, or pubescent; hairy above. Lower glume apex obtuse. Upper glume orbicular; 0.9 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface glabrous, or puberulous; hairy above. Upper glume apex obtuse.
FLORETS Fertile lemma orbicular; 2 mm long; coriaceous; without keel. Lemma margins involute. Lemma apex obtuse. Palea coriaceous; 2 -veined.
FLOWER Anthers 3.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION South America: Caribbean.
NOTES Isachneae. N Amer Fl 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.