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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Ischaemum minus

HABIT Perennial. Culms decumbent; 10–30 cm long; rooting from lower nodes. Culm-internodes 0.6–5 cm long. Leaf-sheaths 2.5–5 cm long. Ligule an eciliate membrane; 1–2 mm long. Leaf-blades lanceolate; 2.5–8 cm long; 3.5–7 mm wide. Leaf-blade surface glabrous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2; paired; 2–4 cm long. Rhachis fragile at the nodes; angular; ciliate on margins. Rhachis internodes oblong; 2–3 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 oblong; 2.5–4 mm long; 0.5–0.66 length of fertile spikelet; ciliate.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; ovate; 5–6 mm long; as long as fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; keeled; muticous. Companion sterile spikelet lemmas 1-awned.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 5–6 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus oblong; base truncate; inserted.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume oblong; 1 length of spikelet; coriaceous; much thinner above; 2-keeled; keeled all along; keeled laterally. Lower glume surface flat; asperulous. Upper glume lanceolate; coriaceous; 1-keeled; 5 -veined. Upper glume surface asperulous.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret lanceolate; membranous. Fertile lemma oblong; membranous; without keel. Lemma apex dentate; 2 -fid; incised 0.1 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus; flexuous; 2–3.5 mm long overall; without a column.

FLOWER Anthers 3; 2.8 mm long.

DISTRIBUTION Asia-temperate: eastern Asia. South America: Brazil and southern South America.

NOTES Andropogoneae. Fl Entre Rios 1994.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.