Deyeuxia nomnov1(Calamagrostis scaberula)

HABIT Perennial; caespitose. Culms erect; 85 cm long. Culm-internodes scaberulous. Leaf-sheaths 8–10 cm long; narrower than blade at the collar; smooth, or scaberulous. Ligule an eciliate membrane; 1.5 mm long; truncate. Leaf-blades conduplicate; 50 cm long.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; 32 cm long; 4 cm wide. Primary panicle branches ascending, or spreading; whorled at most nodes; naked below, or 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; 5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.1 mm long; 0.05 length of lemma.

GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 5–6 mm long; 1 length of upper glume; membranous; mid-green and purple; 1-keeled. Lower glume apex acuminate. Upper glume lanceolate; 5–6 mm long; 1 length of adjacent fertile lemma; membranous; mid-green and purple; 1-keeled. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins prominent. Lemma surface scabrous. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; curved; 4.5 mm long overall. Palea 1 length of lemma. Palea keels approximate. Rhachilla extension 2 mm long; sparsely hairy.

FLOWER Anthers 3; 2.3 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: western South America.

NOTES Aveneae. Swallen 2004.

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