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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 diemii

HABIT Perennial; caespitose. Rhizomes elongated. Culms geniculately ascending; 10–25 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 1.5–3 mm long; erose; acute. Leaf-blades straight; conduplicate; 3–5 cm long; 1–2 mm wide; firm. Leaf-blade surface pilose; hairy adaxially. Leaf-blade apex abruptly acute; hooded.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 3–6 cm long. Primary panicle branches appressed. Panicle branches with scattered hairs, or glabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.6–4.1 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes elongated below proximal fertile floret. Rhachilla elongation 0.2–0.3 mm long. Floret callus pilose. Floret callus hairs 0.33 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acute. Upper glume lanceolate; 1.4 length of adjacent fertile lemma; membranous; purple; 1-keeled; 1–3 -veined. Upper glume lateral veins absent, or obscure. Upper glume surface asperulous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 2.6–3 mm long; membranous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex entire, or erose; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; straight; 3.5–4 mm long overall; not or scarcely exserted from spikelet. Rhachilla extension 0.8–1 mm long; pilose.

FLOWER Lodicules 2; 0.6–0.7 mm long. Anthers 3; 1.3–1.6 mm long; purple. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; ovoid; sulcate on hilar side; 1.6–1.9 mm long. Embryo 0.25 length of caryopsis. Hilum punctiform. Disseminule comprising a floret.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. Fl Pat 1995.

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