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 bacillata

HABIT Perennial; caespitose; clumped densely. Culms 10–30 cm long; 0.2–0.3 mm diam.; 1–2 -noded. Culm-nodes purple. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 1.7–4.3 mm long; acuminate. Leaf-blades filiform; conduplicate; 2–15 cm long; 0.2–0.8 mm wide. Leaf-blade surface ribbed; scaberulous; rough abaxially.

INFLORESCENCE Inflorescence a panicle. Peduncle 2–6 cm long.

Panicle open; oblong; 4–11 cm long; 3–5 cm wide. Primary panicle branches 2 -nate. Panicle branches flexuous.

Spikelets spreading; solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets cuneate; laterally compressed; 1.8–2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; gaping. Lower glume oblong; 1.8–2 mm long; 1 length of upper glume; membranous; purple; 1-keeled; 3 -veined. Lower glume primary vein scaberulous. Lower glume apex acute. Upper glume oblong; 1.8–2 mm long; 1.1 length of adjacent fertile lemma; membranous; purple; 1-keeled; 3 -veined. Upper glume primary vein scaberulous. Upper glume apex acute.

FLORETS Fertile lemma ovate; 1.6–1.8 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins extending close to apex. Lemma apex erose; obtuse; muticous, or awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; straight; 0.3–0.6 mm long overall. Palea 1.1–1.4 mm long; 0.66–0.75 length of lemma; hyaline. Rhachilla extension 1.1–1.4 mm long.

FLOWER Lodicules 2; membranous. Anthers 3; 0.8–1 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION South America: Mesoamericana.

NOTES Aveneae. Fl Costaric 1993.

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