Agrostis thompsoniae

HABIT Annual; caespitose; clumped loosely. Culms erect, or geniculately ascending; slender; 20–40 cm long; 2 -noded. Culm-internodes striate. Leaves mostly basal. Leaf-sheaths loose. Ligule an eciliate membrane; 3–5 mm long; obtuse. Leaf-blades 2.5 mm wide.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate, or ovate; 6–12 cm long; bearing few spikelets. Panicle branches straight.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels straight; 1–2 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 1.5–2.5 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 1.5–2.5 mm long; 1 length of upper glume; membranous; light green, or purple; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1.5–2.5 mm long; 1.1–1.4 length of adjacent fertile lemma; membranous; light green, or purple; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute, or acuminate.

FLORETS Fertile lemma oblong; 1.3–1.8 mm long; hyaline; without keel; 5 -veined. Lemma apex truncate; muticous. Palea absent or minute.

FLOWER Anthers 3; 0.4–0.5 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Australasia: Australia.

NOTES Aveneae. Jacobs 2005.

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