Agrostis insularis

HABIT Perennial; caespitose. Rhizomes elongated. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Basal innovations extravaginal. Culms erect, or geniculately ascending; 28–50 cm long; 2–4 -noded. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 5.5–8.5 mm long; scaberulous on abaxial surface; erose, or lacerate; acute. Leaf-blades conduplicate; 2–25 cm long; 2–4 mm wide. Leaf-blade surface scaberulous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle; embraced at base by subtending leaf.

Panicle open; oblong; 11–13 cm long; 3–4 cm wide. Primary panicle branches ascending. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2–2.5 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.6–3 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded; hairy on the margins. Floret callus hairs 2–2.5 mm long.

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 primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 2.6–3 mm long; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 1.5–1.7 mm long; hyaline; without keel; 5 -veined. Lemma apex erose; truncate; muticous. Palea 0.3 mm long; 0.2–0.25 length of lemma; 0 -veined.

FLOWER Lodicules 2; 0.5–0.6 mm long; membranous. Anthers 3; 0.6–0.9 mm long.

FRUIT Caryopsis with adherent pericarp. Endosperm farinose.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. Rugolo & Molina 2001.

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