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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 philippinense
HABIT Annual. Culms decumbent; 15–20 cm long. Culm-nodes pubescent. Lateral branches ample. Leaf-sheaths 4–5 cm long; glabrous on surface. Ligule an eciliate membrane; 1–1.5 mm long. Leaf-blades 4–5 cm long; 3–4 mm wide. Leaf-blade surface glabrous, or pilose; sparsely hairy; hairy abaxially.
INFLORESCENCE Inflorescence composed of racemes; terminal and axillary.
Racemes 2; paired; appressed back to back; 3–4 cm long. Rhachis fragile at the nodes; angular; ciliate on margins. Rhachis internodes cuneate; 2.5–3 mm long; 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 cuneate; 1 length of internode; ciliate; hairy on one margin.
STERILE SPIKELETS Companion sterile spikelets rudimentary; comprising 2 subequal glumes without lemmas; ovate; 1–1.5 mm long; shorter than fertile; persistent, or separately deciduous. Companion sterile spikelet glumes chartaceous; muticous.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 4 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus 0.3–0.5 mm long; pubescent; base obtuse; inserted.
GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume ovate; 1 length of spikelet; coriaceous; much thinner above; 2-keeled; keeled all along; keeled laterally. Lower glume surface flat; rugose; rough below. Lower glume apex obtuse, or acute. Upper glume lanceolate; chartaceous; 1-keeled; 3 -veined. Upper glume apex obtuse.
FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret lanceolate; 1 length of spikelet; membranous; 2 -veined; acuminate. Palea of lower sterile floret 0.75 length of lemma. Fertile lemma oblong; membranous; without keel. Lemma apex lobed; 2 -fid; incised 0.33 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 15–20 mm long overall; with twisted column. Column of lemma awn glabrous. Palea 1 length of lemma.
DISTRIBUTION Asia-tropical: Malesia.
NOTES Andropogoneae. Ohwi 2001.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
