Agrostis hendersonii

HABIT Annual. Culms erect; 11 cm long; 2 -noded. Lateral branches lacking. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 2–3 mm long; acute. Leaf-blades flat, or convolute; 1–3 cm long; 1 mm wide. Leaf-blade surface glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; oblong; 2.5 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 5–6 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. Lower glume lanceolate; 5–6 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acute; awned; 1 -awned. Lower glume awn 1–2 mm long. Upper glume lanceolate; 5–6 mm long; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acute; awned; 1 -awned. Upper glume awn 1–2 mm long.

FLORETS Fertile lemma elliptic; 3 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins extending close to apex. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn dorsal; arising 0.33–0.5 way up back of lemma; geniculate; 6–10 mm long overall. Lateral lemma awns arising on apex of lobes; 0.5 mm long. Palea absent or minute.

FLOWER Lodicules 2; membranous. Anthers 3; 0.75–1.5 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION North America: northwest USA and southwest USA.

NOTES Aveneae. Man US Gr 1994.

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