Deyeuxia erythrostachya

HABIT Perennial; caespitose; clumped densely. Rhizomes elongated. Culms 2–23 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 4–8 mm long; acute. Leaf-blades curved; elliptic; 0.4–1 mm wide.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; elliptic, or globose; 1–7 cm long. Panicle branches smooth, or scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels smooth, or scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes elongated below proximal fertile floret. Rhachilla elongation 0.5 mm long. Floret callus bearded. Floret callus hairs 1 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 primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1.8–2.1 length of adjacent fertile lemma; membranous; purple; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 2–2.6 mm long; membranous; without keel; 0–4 -veined. Lemma lateral veins obscure. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25–0.33 way up back of lemma; straight; 3.5–5.5 mm long overall. Palea keels scabrous; adorned above.

FLOWER Lodicules 2. Anthers 3; 0.5–0.7 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; 1.4–2 mm long. Embryo 0.33 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.