Deyeuxia sclerantha

HABIT Perennial. Culms erect; 16–65 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.5–1 mm long; erose; truncate. Leaf-blades 3–17 cm long; 2–3 mm wide. Leaf-blade surface smooth, or scaberulous; rough abaxially; glabrous. Leaf-blade margins scaberulous.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; continuous, or interrupted; 4–15 cm long; 0.7–1 cm wide.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels smooth, or scaberulous; glabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.5–0.8 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 4.5–5 mm long; 1.4–1.5 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume primary vein scaberulous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3–3.3 mm long; cartilaginous; shiny; without keel. Lemma apex erose; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33 way up back of lemma; geniculate; 4–4.3 mm long overall; with a straight or slightly twisted column. Rhachilla extension 1–1.2 mm long; pubescent; with 0.5–0.9 mm long hairs.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

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

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

NOTES Aveneae. =Calamagrostis spiciformis. Tovar 1995.

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