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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Agrostis serranoi

HABIT Perennial; caespitose. Rhizomes short. Basal innovations extravaginal. Culms erect; 20–60 cm long; 2 -noded. Lateral branches lacking. Leaf-sheaths smooth. Ligule an eciliate membrane; 2.5–5 mm long; scaberulous on abaxial surface; erose. Leaf-blades 3–8 cm long; 2–3 mm wide. Leaf-blade surface smooth, or scabrous; rough on both sides. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth.

Panicle open; lanceolate; 8–20 cm long; 2–8 cm wide; with spikelets clustered towards branch tips. Primary panicle branches appressed, or ascending; 2–3 -nate; whorled at most nodes; rebranched at middle. Panicle branches flexuous; scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 5–15 mm long; smooth, or scaberulous; tip widened.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.3–3 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent; hairy in 2 tufts. Floret callus hairs 0.5 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 2.3–3 mm long; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 2.3–3 mm long; membranous; purple; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 1.7–2 mm long; hyaline; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex muticous, or awned; 1 -awned. Principal lemma awn dorsal; arising 0.75 way up back of lemma; straight; 1–2 mm long overall. Palea 0.5–0.7 mm long; hyaline.

FLOWER Lodicules 2; 0.5–0.6 mm long; membranous. Anthers 3; 0.4–0.5 mm long.

FRUIT Caryopsis with adherent pericarp; sulcate on hilar side; 1–1.2 mm long. Hilum linear.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. Agrasar 1995.

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