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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 albovillosum

HABIT Perennial; caespitose. Culms 20–40 cm long. Culm-nodes bearded. Lateral branches lacking. Ligule an eciliate membrane; 1 mm long. Leaf-blades 5–12 cm long; 2–3 mm wide.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; 6–8 cm long; bearing 10–12 fertile spikelets on each. Rhachis fragile at the nodes; angular; ciliate on margins. Rhachis hairs white. Rhachis internodes oblong; 5 mm long. 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; 6 mm long; 0.6 length of fertile spikelet; ciliate; with white hairs.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; elliptic; 10 mm long; as long as fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; keeled; 15–17 -veined; villous; muticous. Companion sterile spikelet lemmas muticous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 10 mm long; 2 mm wide; 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 elliptic; 1 length of spikelet; coriaceous; 2-keeled; keeled all along; keeled laterally; 9 -veined. Lower glume surface convex; glabrous; inner surface villous. Lower glume apex erose. Upper glume lanceolate; coriaceous; 1-keeled; 5 -veined. Upper glume primary vein ciliate. Upper glume inner surface villous. Upper glume apex acuminate.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; membranous. Fertile lemma linear; 5 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; 20–30 mm long overall; with twisted column. Column of lemma awn glabrous. Palea absent or minute.

FLOWER Anthers 3; 1 mm long.

DISTRIBUTION Australasia: Australia.

NOTES Andropogoneae. Simon 1994.

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