Deyeuxia fuscata

HABIT Perennial; caespitose. Culms erect; 25–50 cm long. Leaves mostly basal. Leaf-sheaths 1.5–8 cm long; smooth, or scaberulous; glabrous on surface. Ligule an eciliate membrane; 2–2.5 mm long; truncate. Leaf-blades involute; 5–25 cm long; 1–2 mm wide; coriaceous. Leaf-blade surface scabrous; rough on both sides.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 5–9 cm long. Primary panicle branches appressed, or ascending.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.5–1 mm long.

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 ciliolate. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 6–6.5 mm long; 1.2–1.4 length of adjacent fertile lemma; membranous; purple; 1-keeled. Upper glume primary vein ciliolate. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 4.2–5.3 mm long; membranous; without keel. Lemma surface scabrous. Lemma apex erose; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25–0.5 way up back of lemma; geniculate; 6–7.5 mm long overall; with twisted column. Rhachilla extension 2–2.5 mm long; pilose; with 1–1.8 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.

NOTES Aveneae. Tovar 1995.

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