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Descriptions

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

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

Agrostopoa wallisii

HABIT Annual. Culms erect; slender; 7–15 cm long; 6–8 -noded. Culm-internodes smooth; distally glabrous. Lateral branches ample; arising from lower culm. Leaves mostly basal. Leaf-sheaths loose; open for most of their length; smooth. Ligule an eciliate membrane; 0.8–3.5 mm long; entire, or erose; acute. Leaf-blades flat, or involute; 0.8–2.5 cm long; 0.3 mm wide. Leaf-blade surface smooth; glabrous.

INFLORESCENCE Inflorescence a panicle; comprising 5–15 fertile spikelets; embraced at base by subtending leaf.

Panicle open; oblong; 1–3.5 cm long; bearing few spikelets. Primary panicle branches 1–4 -nate; 1–1.5 cm long. Panicle axis 3–5 noded.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.4–3 mm long; tip widened.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 3–10 mm long; with hairs extending 2.4–3.9 mm beyond apex; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; exceeding apex of florets. Lower glume lanceolate; 2.3–2.6 mm long; 0.66–0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein smooth. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 2.4–3.9 mm long; 1.1–1.3 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein smooth. Upper glume lateral veins absent. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 2.1–3 mm long; membranous; much thinner above; keeled; 5 -veined. Lemma midvein scaberulous (above). Lemma lateral veins obscure. Lemma apex acute; awned; 1 -awned. Principal lemma awn apical; 2.5–5.2 mm long overall; without a column (but loosely twisted). Palea 1 length of lemma. Palea keels 0.2 mm apart; smooth.

FLOWER Lodicules 2; 0.3 mm long. Anthers 3; 1.6–2.1 mm long.

FRUIT Caryopsis with adherent pericarp; 1.5 mm long; dark brown. Disseminule comprising a floret.

DISTRIBUTION South America: western South America.

NOTES Poeae. Peterson et al 2009.

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