Deyeuxia chaseae

HABIT Perennial; caespitose. Culms erect; 75 cm long. Lateral branches lacking. Leaf-sheaths antrorsely scabrous; glabrous on surface. Ligule an eciliate membrane; 2–3.5 mm long; acute. Leaf-blades filiform; conduplicate, or involute; 6–15 cm long; 1.5–2 mm wide. Leaf-blade surface scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 16 cm long; 1–1.5 cm wide. Primary panicle branches appressed, or ascending; bearing spikelets almost to the base.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 5.5 mm long; 1 length of upper glume; membranous; purple; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume apex acute. Upper glume lanceolate; 5.5 mm long; 1.1–1.5 length of adjacent fertile lemma; membranous; purple; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute; muticous, or mucronate.

FLORETS Fertile lemma oblong; 3.7–5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface scaberulous. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; geniculate; 6–8 mm long overall; with twisted column. Rhachilla extension 0.33–0.5 length of fertile floret; pilose.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

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

DISTRIBUTION South America: northern South America.

NOTES Aveneae. Luces 1996.

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