Deyeuxia ramonae

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms 30–50 cm long. Leaf-sheaths 8–11 cm long; antrorsely scabrous. Ligule an eciliate membrane; 0.5 mm long; truncate. Leaf-blades 8–19 cm long; 3–4 mm wide.

INFLORESCENCE Inflorescence a panicle. Peduncle scaberulous above.

Panicle open; linear; nodding; 46–65 cm long; 1.5 cm wide.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4–5 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 pilose. Floret callus hairs 0.5–1 mm long; 0.2–0.33 length of lemma.

GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 3–4 mm long; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume apex acute. Upper glume lanceolate; 3–4 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3.5 mm long; membranous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight; 5 mm long overall; with twisted column. Palea 3 mm long. Palea keels scabrous. Rhachilla extension 3 mm long; pilose; with 1–2 mm long hairs.

FLOWER Anthers 3; 0.5 mm long.

FRUIT Caryopsis with adherent pericarp; 1 mm long. Endosperm soft.

DISTRIBUTION South America: northern South America.

NOTES Aveneae. Escalona 2004.

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