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Descriptions

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

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

Schizachyrium impressum

HABIT Perennial. Culms 40–50 cm long. Ligule an eciliate membrane. Leaf-blades 12–18 cm long; 1.5 mm wide. Leaf-blade apex acuminate; filiform.

INFLORESCENCE Synflorescence compound; fastigiate. Inflorescence composed of racemes; terminal and axillary; subtended by a spatheole; exserted. Spatheole linear; 2–2.5 cm long; herbaceous.

Racemes 1; single; 2 cm long. Rhachis fragile at the nodes; semiterete; ciliate on margins. Rhachis internodes cuneate. Rhachis internode tip crateriform; with scarious rim.

Spikelets appressed; in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels cuneate; ciliate.

STERILE SPIKELETS Companion sterile spikelets well-developed; male; lanceolate; dorsally compressed; 6–7 mm long; longer than fertile; separately deciduous. Companion sterile spikelet glumes coriaceous; muticous. Companion sterile spikelet lemmas 2; enclosed by glumes.

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

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of spikelet; coriaceous; 2-keeled; keeled all along; keeled laterally; keeled obtusely. Lower glume intercarinal veins obscure. Lower glume surface concave, or deeply depressed; impressed below. Upper glume lanceolate; membranous; 1-keeled.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; hyaline; 2 -veined. Fertile lemma oblong; hyaline; without keel; 1 -veined. Lemma apex lobed; 2 -fid; with lanceolate lobes; incised 0.75 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 15–18 mm long overall; with twisted column. Column of lemma awn glabrous. Palea absent or minute.

DISTRIBUTION Asia-tropical: India.

NOTES Andropogoneae. Fl Pak 1993.

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