Calamagrostis pisinna

HABIT Perennial; caespitose. Culms erect; 10–17 cm long. Leaves mostly basal. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 1–2 mm long; truncate. Leaf-blades 2–4 cm long; 1–2 mm wide. Leaf-blade surface scaberulous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; loose; 3–5 cm long; 1–1.5 cm wide.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5–4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.2–0.5 mm long; 0.1 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 3.5–4 mm long; 1 length of upper glume; membranous; purple; 1-keeled; 1–3 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent, or obscure. Lower glume apex acute. Upper glume lanceolate; 3.5–4 mm long; 1.1–1.3 length of adjacent fertile lemma; membranous; purple; 1-keeled; 3 -veined. Upper glume primary vein scaberulous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight; 6 mm long overall; with a straight or slightly twisted column. Palea 0.9 length of lemma. Rhachilla extension 1 mm long; villous; with 3 mm long hairs.

FLOWER Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: northern South America and western South America.

NOTES Aveneae. Swallen 2004.

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