GrassBase - The Online World Grass Flora


W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Deyeuxia guamanensis

HABIT Perennial; caespitose; clumped loosely. Basal innovations intravaginal. Culms erect; 6–15 cm long. Leaf-sheaths smooth. Ligule an eciliate membrane; 1 mm long; truncate. Leaf-blades conduplicate; 2–8 cm long; 2–3 mm wide. Leaf-blade midrib indistinct.

INFLORESCENCE Inflorescence a panicle. Peduncle 7–14 cm long.

Panicle open; lanceolate; 5–8 cm long; 1–2 cm wide. Panicle axis glabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels glabrous.

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 1 mm long. Floret callus pilose. Floret callus hairs 0.5 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 4–5 mm long; 1 length of upper glume; membranous; purple (at tip); 1-keeled; 3 -veined. Lower glume apex acute. Upper glume lanceolate; 4–5 mm long; 1.6 length of adjacent fertile lemma; membranous; purple (at tip); 1-keeled; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 2.5–3 mm long; membranous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight, or curved; 7–9 mm long overall. Palea 2 mm long. Palea keels scaberulous. Rhachilla extension 1.5 mm long; villous; with 2 mm long hairs.

FLOWER Anthers 3; 1 mm long; purple.

FRUIT Caryopsis with adherent pericarp; ovoid. Endosperm liquid.

DISTRIBUTION South America: western South America.

NOTES Aveneae. Escalona 2004.

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