Agrostis hygrometrica

HABIT Annual; caespitose. Culms erect; 10–60 cm long. Ligule an eciliate membrane; 1–6 mm long. Leaf-blades 2–3 mm wide.

INFLORESCENCE Inflorescence a panicle, or a panicle with branches tipped by a raceme.

Panicle open; lanceolate; interrupted; 5–20 cm long; 1–3 cm wide; contracted about primary branches. Primary panicle branches appressed, or ascending; bearing spikelets almost to the base.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.5–4 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 lanceolate; 0.8–0.9 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; 2.5–4 mm long; 1.1 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 elliptic; 2–2.3 mm long; hyaline; without keel; 5 -veined. Lemma apex dentate; 4 -fid; truncate; awned; 3 -awned. Principal lemma awn dorsal; arising 0.33 way up back of lemma; geniculate; 4–6 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes (outer lobes); 0.8 mm long. Palea absent or minute.

FLOWER Lodicules 2; membranous. Anthers 3; 0.5–0.7 mm long.

FRUIT Caryopsis with adherent pericarp; oblong; 1.5 mm long; dark brown. Hilum linear.

DISTRIBUTION South America: Brazil and southern South America.

NOTES Aveneae. Fl Entre Rios 1995.

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