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Descriptions

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

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

Duthiea brachypodium

HABIT Perennial; caespitose. Butt sheaths persistent and investing base of culm; with compacted dead sheaths. Culms erect; 30–60 cm long. Ligule an eciliate membrane; 5 mm long. Leaf-blades involute; 6–16 cm long; 2.5–3 mm wide. Leaf-blade surface ribbed; scabrous; glabrous. Leaf-blade apex attenuate; hardened.

INFLORESCENCE Inflorescence composed of racemes; embraced at base by subtending leaf. Peduncle antrorsely scabrous above.

Racemes 1; single; erect; unilateral; 7 cm long; bearing few fertile spikelets; bearing 8–11 fertile spikelets on each. Rhachis subterete; scabrous on surface.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2–4 mm long; scabrous.

STERILE SPIKELETS Basal sterile spikelets represented by a single scale; 1 in number; 2–6 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 15–18 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; pubescent; obtuse; disarticulating obliquely.

GLUMES Glumes persistent; similar; reaching apex of florets; similar to fertile lemma in texture; parallel to lemmas. Lower glume elliptic; 1 length of upper glume; herbaceous; 1-keeled; 9 -veined. Lower glume surface asperulous. Lower glume apex acute. Upper glume elliptic; 1 length of adjacent fertile lemma; herbaceous; with hyaline margins; 1-keeled; 8–9 -veined. Upper glume surface asperulous. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 15–16 mm long; membranous; much thinner on margins; without keel; 9 -veined. Lemma surface scaberulous; glabrous; with a transverse fringe of hair. Lemma apex lobed; 2 -fid; incised 0.5 of lemma length; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 22 mm long overall; with twisted column. Palea 2 -veined. Palea keels scabrous. Palea surface glabrous. Palea apex with excurrent keel veins.

FLOWER Lodicules absent. Anthers 3. Stigmas 2; terminally exserted; papillose. Styles 5 mm long; connate below; 1 of their length connate.

DISTRIBUTION Asia-temperate: China. Asia-tropical: India.

NOTES Duthieeae. Bor.

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