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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 hansenii
HABIT Annual. Culms decumbent; 20–45 cm long; rooting from lower nodes. Ligule an eciliate membrane; 1–2 mm long. Leaf-blade base broadly rounded. Leaf-blades lanceolate; 5–8 cm long; 5–12 mm wide; red. Leaf-blade surface glabrous.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 2; paired; appressed back to back; 3–5 cm long. Rhachis fragile at the nodes; angular; ciliate on margins. Rhachis internodes oblong; 2.5 mm long; 0.33 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; 2.5 mm long; 0.33 length of fertile spikelet; ciliate.
STERILE SPIKELETS Companion sterile spikelets well-developed; male; ovate; laterally compressed; 6 mm long; shorter than fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; keeled; scaberulous on margins. Companion sterile spikelet lemmas 2; enclosed by glumes; 1-awned; with 10 mm long awn.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; 8–9 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus oblong; 3 mm long; pubescent; base truncate; inserted.
GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma; shiny. Lower glume elliptic; 1 length of spikelet; coriaceous; much thinner above; 2-keeled; keeled above; keeled laterally; 6 -veined. Lower glume surface convex. Lower glume apex dentate; 2 -fid. Upper glume lanceolate; coriaceous; 1-keeled; keeled above; winged on keel. Upper glume margins ciliolate.
FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret lanceolate; membranous. Fertile lemma oblong; 5 mm long; membranous; without keel; 3 -veined. Lemma apex lobed; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 14 mm long overall; with 9 mm long limb; with twisted column. Column of lemma awn 5 mm long; glabrous.
FLOWER Anthers 3; 2 mm long.
DISTRIBUTION Asia-tropical: Indo-China.
NOTES Andropogoneae. Bor 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
