Calamagrostis viridiflavescens

HABIT Perennial. Rhizomes short. Basal innovations extravaginal. Culms erect; 60–130 cm long; 2–3 -noded. Leaf-sheaths glabrous on surface, or pubescent. Ligule an eciliate membrane; erose. Leaf-blades 4–6 mm wide.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; nodding; 15–30 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1.3–1.7 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3–4.5 mm long; membranous; without keel; 5 -veined. Lemma apex acute; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; straight; 1–3 mm long overall. Rhachilla extension 0.2–2 mm long; pilose.

FLOWER Lodicules 2. Anthers 3; 0.3–0.8 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; oblong; 2–3 mm long. Hilum punctiform. Disseminule comprising a floret.

DISTRIBUTION North America: Mexico. South America: western South America, Brazil, and southern South America.

NOTES Aveneae. Fl Entre Rios 1995.

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