GrassBase - The Online World Grass Flora


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

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

Deyeuxia heterophylla

HABIT Perennial. Culms erect, or geniculately ascending; 8–60 cm long. Leaf-sheaths glabrous on surface, or puberulous. Ligule an eciliate membrane; 1.5–4 mm long; truncate. Leaf-blades 3–15 cm long; 2–5 mm wide. Leaf-blade surface pubescent; hairy on both sides.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted, or spiciform; linear; 2–20 cm long; 0.6–2 cm wide. Primary panicle branches appressed, or ascending; bearing spikelets almost to the base.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels puberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5–4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.4–1 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; light green, or purple; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface puberulous. Lower glume apex acute. Upper glume lanceolate; 3.5–4.5 mm long; 1.1–1.2 length of adjacent fertile lemma; membranous; light green, or purple; 1-keeled. Upper glume surface puberulous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3–3.7 mm long; membranous; without keel. Lemma surface scabrous; glabrous, or puberulous. Lemma apex dentate; 3–4 -fid; awned; 5 -awned. Principal lemma awn dorsal; arising 0.4–0.5 way up back of lemma; geniculate; 4.3–5.8 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; 0.5 mm long. Rhachilla extension 0.6–1 mm long; pubescent; with 0.5–1 mm long hairs.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.

DISTRIBUTION South America: northern South America, western South America, and southern South America.

NOTES Aveneae. Tovar 1995.

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