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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 masafuerana

HABIT Perennial; caespitose. Rhizomes short. Culms erect; 30–40 cm long; 3–4 -noded. Culm-internodes brown; distally glabrous. Lateral branches lacking. Leaf-sheaths 2–8 cm long; striately veined; glabrous on surface. Ligule an eciliate membrane; 3–3.5 mm long; erose; acute. Leaf-blades 3–10 cm long; 2–3 mm wide. Leaf-blade surface smooth. Leaf-blade margins scaberulous.

INFLORESCENCE Inflorescence a panicle; exserted, or embraced at base by subtending leaf.

Panicle contracted; linear, or oblong; 7–12 cm long; 1–2 cm wide. Panicle branches smooth.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1.5–4.5 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 3.5–4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus sparsely hairy; hairy on the margins.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface smooth, or asperulous. Lower glume apex acuminate. Upper glume lanceolate; 3.5–4.5 mm long; membranous; purple; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume lateral veins distinct. Upper glume surface smooth, or asperulous. Upper glume apex acuminate.

FLORETS Fertile lemma elliptic; 1.5–2 mm long; hyaline; without keel; 5 -veined. Lemma surface scaberulous; rough on veins. Lemma apex erose; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; straight; 0.5–1.2 mm long overall; not or scarcely exserted from spikelet. Palea 0.2–0.3 mm long; 0.1–0.15 length of lemma; 0 -veined. Palea apex dentate; 3 -fid.

FLOWER Lodicules 2; 0.4–0.5 mm long; membranous. Anthers 3; 0.8–1 mm long.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 1–1.5 mm long. Hilum elliptic. Endosperm farinose.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. Rugolo & Molina 2001.

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