Calamagrostis pinetorum

HABIT Perennial. Rhizomes short. Culms erect; 120 cm long. Culm-internodes distally glabrous. Leaf-sheaths scaberulous. Ligule an eciliate membrane; 4.5 mm long; obtuse. Leaf-blades 26–33 cm long; 5–6 mm wide. Leaf-blade surface scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; interrupted; dense; 16 cm long; 3 cm wide. Primary panicle branches ascending.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 5.5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume surface scabrous. Lower glume apex acute. Upper glume lanceolate; 5.5–6 mm long; 1.3–1.4 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume surface scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 4 mm long; membranous; without keel. Lemma apex awned; 5 -awned. Principal lemma awn dorsal; arising 0.25 way up back of lemma; geniculate; 3 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; 1 mm long. Rhachilla extension 1 mm long; pubescent; with 0.5 mm long hairs. Apical sterile florets 1 in number; linear (bristle-like); 2 mm long.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.

DISTRIBUTION South America: Mesoamericana.

NOTES Aveneae. Swallen 1995.

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