Agrostis jahnii

HABIT Perennial; caespitose. Culms erect; slender; 20–30 cm long. Culm-internodes smooth, or scaberulous. Leaves mostly basal. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 1.5–2 mm long; obtuse. Leaf-blades flat, or conduplicate; 5–7 cm long; 1.5–2 mm wide. Leaf-blade surface scaberulous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 7–11 cm long. Primary panicle branches ascending; whorled at most nodes. Panicle branches stiff.

Spikelets appressed; solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 1.7–2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; gaping. Lower glume oblong; 1.7–2 mm long; 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; 1.7–2 mm long; 1.4 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma ovate; 1.3 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins obscure. Lemma apex dentate; 4 -fid; truncate; muticous. Palea absent or minute.

FLOWER Lodicules 2; membranous. Anthers 3.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION South America: northern South America.

NOTES Aveneae. Luces 1996.

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