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Descriptions

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

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

Deyeuxia mazettii

HABIT Perennial; caespitose. Culms erect; 20–50 cm long; 1 mm diam. Culm-internodes smooth; distally glabrous. Lateral branches lacking. Leaf-sheaths papillose. Ligule an eciliate membrane; 1–3 mm long; lacerate; truncate. Leaf-blades filiform; convolute; 10–20 cm long; 0.5 mm wide. Leaf-blade venation with 8 secondary veins. Leaf-blade surface scabrous; rough adaxially. Leaf-blade margins scabrous. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; 6–14 cm long. Primary panicle branches appressed; 3–8 -nate; bearing 5–10 fertile spikelets on each lower branch.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2–10 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 1–1.5 mm long; 0.25–0.33 length of lemma.

GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 4–5 mm long; 1 length of upper glume; membranous; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 4–5 mm long; 1 length of adjacent fertile lemma; membranous; without keels; 0 -veined. Upper glume primary vein absent. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 4–5 mm long; membranous; without keel; 3(–5) -veined. Lemma apex dentate; 2–4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; geniculate; 8–10 mm long overall; with twisted column. Palea 0.66 length of lemma; hyaline; 2 -veined; without keels. Palea apex obtuse. Rhachilla extension 1.5 mm long; villous.

FLOWER Lodicules 2. Anthers 3; 2 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-temperate: China.

NOTES Aveneae. Hand-Mazz 2000.

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