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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 platensis

HABIT Perennial. Basal innovations extravaginal. Culms decumbent; 70–150 cm long; rooting from lower nodes. Culm-internodes distally glabrous. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 4–8 mm long; lacerate. Leaf-blades 10–25 cm long; 4–8 mm wide; flaccid. Leaf-blade surface glabrous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear, or oblong; 12–25 cm long; 1–3 cm wide. Primary panicle branches appressed; 2–6 -nate; 2–5 cm long. Panicle axis smooth.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1 length of fertile spikelet; scabrous; tip widened.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 3 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. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acuminate; awned; 1 -awned. Lower glume awn 0.5–1 mm long. Upper glume lanceolate; 3 mm long; 2 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume surface asperulous. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 0.5–1 mm long.

FLORETS Fertile lemma ovate; 1.5 mm long; hyaline; without keel; 5 -veined. Lemma apex erose; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33 way up back of lemma; straight; 1–2 mm long overall; not or scarcely exserted from spikelet. Palea 0.8 mm long; hyaline; 0 -veined.

FLOWER Lodicules 2; membranous. Anthers 3; 0.8 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION South America: Brazil and southern South America.

NOTES Aveneae. Parodi 1997.

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