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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 polygonoides
HABIT Perennial. Culms decumbent; 50–60 cm long; rooting from lower nodes. Culm-internodes distally glabrous. Culm-nodes glabrous, or pubescent. Lateral branches ample. Leaf-sheaths glabrous on surface, or hispid; with tubercle-based hairs. Ligule a fringe of hairs; 1–2.5 mm long. Leaf-blade base cordate. Leaf-blades lanceolate; 2–4 cm long; 7–13 mm wide. Leaf-blade surface scabrous; rough adaxially; puberulous; hairy abaxially. Leaf-blade margins scabrous.
INFLORESCENCE Inflorescence a panicle; embraced at base by subtending leaf.
Panicle open; pyramidal; 2–6 cm long. Primary panicle branches spreading; 1 -nate. Panicle branches glandular.
Spikelets spreading; solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or orbicular; dorsally compressed; 1.3–2 mm long; breaking up at maturity; disarticulating above glumes but not between florets. Rhachilla internodes elongated between glumes.
GLUMES Glumes deciduous; similar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 1.2–1.8 mm long; 0.9 length of spikelet; membranous; without keels; 5 -veined. Lower glume surface glabrous, or pubescent; hairy at apex. Lower glume apex acute. Upper glume ovate; 1.3–1.9 mm long; 1 length of spikelet; membranous; without keels; 7 -veined. Upper glume surface glabrous, or pubescent; hairy at apex. Upper glume apex acute.
FLORETS Basal sterile florets male; with palea; attached to and deciduous with the fertile. Lemma of lower sterile floret ovate; 1.5–1.7 mm long; chartaceous; 5 -veined; glabrous; obtuse. Fertile florets female. Fertile lemma ovate; 1.2–1.5 mm long; coriaceous; without keel. Lemma surface puberulous. Lemma margins involute. Lemma apex obtuse. Palea coriaceous; 2 -veined.
FLOWER Anthers 3; 0.4–0.5 mm long.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION Asia-tropical: Indo-China. North America: Mexico. South America: Mesoamericana, Caribbean, northern South America, western South America, and Brazil.
NOTES Isachneae. Fl Costa Rica 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
