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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.
Ischaemum lisboae
HABIT Perennial. Culms decumbent; 20–35 cm long; 3 -noded. Leaves distichous. Leaf-sheaths 13–25 cm long; hirsute. Ligule an eciliate membrane. Leaf-blades spreading; lanceolate; 2.5–5 cm long; 6–10 mm wide. Leaf-blade surface pubescent; hairy on both sides. Leaf-blade apex acute.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 2; paired; 5 cm long. Rhachis fragile at the nodes; angular; ciliate on margins. Rhachis internodes oblong; 0.5 length of fertile spikelet; flat and forming a U or V shape with the pedicel in rear view. Rhachis internode tip transverse; cupuliform.
Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels oblong; 0.5 length of fertile spikelet; ciliate.
STERILE SPIKELETS Companion sterile spikelets well-developed; containing empty lemmas, or male; lanceolate; laterally compressed; 5 mm long; as long as fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; keeled; winged on keels.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; 5 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus oblong; glabrous; base truncate; inserted.
GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; 1 length of spikelet; coriaceous; 2-keeled; keeled above; keeled laterally; winged on keel; winged broadly; winged above. Lower glume surface convex. Lower glume margins ciliate. Lower glume apex dentate; 2 -fid. Upper glume lanceolate; coriaceous; 1-keeled; keeled above; winged on keel; winged above. Upper glume awned; 1 -awned.
FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret oblong, or ovate; membranous; ciliate on margins. Palea of lower sterile floret winged on keels. Fertile lemma oblong; 2 mm long; membranous; without keel. Lemma apex lobed; 2 -fid; incised 0.5 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 4 mm long overall; with twisted column. Column of lemma awn glabrous.
FLOWER Anthers 3.
DISTRIBUTION Asia-tropical: India.
NOTES Andropogoneae. Blatt & McCann 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
