Agrostis calderoniae

HABIT Perennial. Culms erect; 15–38 cm long. Lateral branches lacking. Leaf-sheaths antrorsely scabrous. Ligule an eciliate membrane; 1.5–4 mm long. Leaf-blades filiform; involute; 2–10 cm long; 1–2 mm wide. Leaf-blade surface scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; loose; 5–10 cm long; 2–9 cm wide. Primary panicle branches ascending; branching divaricately; rebranched at middle; 2–5 cm long. Panicle branches flexuous; scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets. Spikelets elliptic; laterally compressed; 2.5–3.5 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 2.5–3.5 mm long; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 2.5–3.5 mm long; membranous; purple; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 2–2.5 mm long; hyaline; without keel; 5 -veined. Lemma surface glabrous. Lemma apex obtuse; muticous. Palea 0.7–1 mm long; 0.33 length of lemma; hyaline.

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

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION North America: Mexico.

NOTES Aveneae. Acosta 2004.

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