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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 stapfii

HABIT Perennial. Culms rambling; 40–80 cm long; rooting from lower nodes. Leaf-sheaths outer margin hairy. Ligule a ciliolate membrane. Leaf-blade base with a false petiole. Leaf-blades elliptic; 10–15 cm long; 10–20 mm wide; flaccid. Leaf-blade surface pubescent; hairy abaxially. Leaf-blade margins scabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 6–9; digitate; 4–7 cm long. Rhachis fragile at the nodes; pilose on surface; ciliate on margins. Rhachis hairs dark brown. Rhachis internodes clavate; 4.5 mm long.

Spikelets in pairs. Fertile spikelets sessile and pedicelled; 2 in the cluster. Pedicels clavate; ciliate.

STERILE SPIKELETS Basal sterile spikelets well-developed; 6–8 in number; lanceolate; 4 mm long; equalling fertile. Basal sterile spikelet glumes glabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 4.5 mm long; falling entire; deciduous from the base, or with accessory branch structures. Spikelet callus square; 0.5 mm long; base obtuse; attached transversely.

GLUMES Glumes dissimilar; firmer than fertile lemma. Lower glume elliptic; 1 length of spikelet; coriaceous; 2-keeled; keeled obtusely; 4 -veined. Lower glume lateral veins with cross-veins. Lower glume surface with a longitudinal median groove; pilose. Lower glume hairs dark brown. Lower glume apex obtuse. Upper glume elliptic; 1-keeled. Upper glume surface pilose; hairy above. Upper glume hairs dark brown. Upper glume apex dentate; 2 -fid; awned; 1 -awned.

FLORETS Basal sterile florets with vestigial lower floret. Fertile lemma orbicular; hyaline; without keel. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 20 mm long overall; with twisted column. Column of lemma awn 6 mm long. Palea 1 length of lemma; hyaline.

FLOWER Lodicules 2. Anthers 3.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Andropogoneae. Bor.

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