Agrostis turrialbae

HABIT Perennial; caespitose. Culms erect, or geniculately ascending, or decumbent; 10–40 cm long; 0.5–1 mm diam.; 1–2 -noded; without nodal roots, or rooting from lower nodes. Culm-nodes purple. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 1.5–3.5 mm long. Leaf-blades flat; 5–10 cm long; 1–2 mm wide. Leaf-blade surface ribbed; smooth, or scaberulous. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence a panicle. Peduncle 5–10 cm long.

Panicle open; elliptic, or pyramidal; 4–12 cm long; 2–6 cm wide. Primary panicle branches 3–6 -nate; whorled at most nodes.

Spikelets ascending; solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2–2.1 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; shiny; gaping. Lower glume oblong; 2–2.1 mm long; 1.1 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 oblong; 1.8–2 mm long; 1.5 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma ovate; 1.2–1.4 mm long; hyaline; without keel. Lemma lateral veins extending close to apex. Lemma apex erose; obtuse; muticous. Palea absent or minute.

FLOWER Lodicules 2; membranous. Anthers 3; 0.7 mm long; purple.

FRUIT Caryopsis with adherent pericarp; ellipsoid. Hilum linear.

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

NOTES Aveneae. Fl Costaric 1993.

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