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Descriptions

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

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

Microstegium batangense

HABIT Annual. Rhizomes elongated. Culms geniculately ascending, or decumbent; slender; 20–45 cm long. Culm-nodes glabrous. Lateral branches ample. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.6–1 mm long. Leaf-blades linear, or lanceolate; 1–5.5 cm long; 1.5–2 mm wide; firm; glaucous. Leaf-blade surface smooth; glabrous; hairless except near base. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; 5.5–6.5 cm long. Rhachis fragile at the nodes; semiterete; ciliate on margins. Rhachis hairs 2 mm long. Rhachis internodes filiform; 1 length of fertile spikelet. Rhachis internode tip clavate.

Spikelets in pairs. Fertile spikelets sessile; 2 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels filiform; ciliate.

STERILE SPIKELETS Companion sterile spikelets rudimentary, or well-developed; containing empty lemmas, or male; lanceolate.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 4–6.5 mm long; falling entire; deciduous from the base and with accessory branch structures. Spikelet callus pilose; base obtuse; attached transversely. Spikelet callus hairs 2–3 mm long.

GLUMES Glumes dissimilar; firmer than fertile lemma. Lower glume linear, or lanceolate; 1 length of spikelet; coriaceous; 2-keeled; keeled above; 5–7 -veined. Lower glume lateral veins with cross-veins. Lower glume surface with a longitudinal median groove; scabrous. Lower glume apex acuminate. Upper glume elliptic; without keels; 7 -veined. Upper glume lateral veins with cross-veins. Upper glume margins ciliolate. Upper glume apex acute; mucronate.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret lanceolate; hyaline. Fertile lemma linear; 3.5–4 mm long; hyaline; without keel. Lemma margins ciliate. Lemma apex lobed; 2 -fid; incised 0.5 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 10–14 mm long overall; with twisted column. Palea absent or minute.

FLOWER Anthers 2; 3 mm long.

DISTRIBUTION Asia-temperate: China.

NOTES Andropogoneae. Fl China 2007.

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