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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Agrostopoa barclayae
HABIT Perennial; caespitose; clumped loosely. Butt sheaths persistent and investing base of culm; with soft dead sheaths. Culms erect, or geniculately ascending; 11–29 cm long; 3–10 -noded; without nodal roots, or rooting from lower nodes. Culm-internodes smooth. Leaves basal and cauline. Leaf-sheaths open for most of their length. Ligule an eciliate membrane; 1–3.1 mm long; erose. Leaf-blades flat, or involute; 1.5–5 cm long; 0.3–0.5 mm wide. Leaf-blade surface smooth; glabrous.
INFLORESCENCE Inflorescence a panicle; comprising 5–20(–30) fertile spikelets.
Panicle open; oblong; 2–4 cm long. Primary panicle branches spreading; bearing 1–3 fertile spikelets on each lower branch. Panicle axis 2–4 noded.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.7–4 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 (3.5–)4–4.5 mm beyond apex; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.
GLUMES Glumes persistent; similar; reaching apex of florets. Lower glume lanceolate; (2.8–)3.4–4.4 mm long; 0.8–1 length of upper glume; membranous; much thinner on margins; 1-keeled; 1 -veined, or 3 -veined. Lower glume primary vein scaberulous (above). Lower glume lateral veins absent, or distinct. Lower glume apex acute. Upper glume lanceolate; (3.2–)4–4.4 mm long; 1 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 1 -veined, or 3 -veined. Upper glume primary vein scaberulous (above). Upper glume lateral veins absent, or distinct. Upper glume apex acute.
FLORETS Fertile lemma ovate; 4–4.5 mm long; membranous; much thinner above; keeled; 5 -veined. Lemma midvein scaberulous (above). Lemma lateral veins obscure. Lemma surface papillose. Lemma apex entire, or dentate; 3 -fid; with lobes 0.2 mm long; acute; awned; 1 -awned. Principal lemma awn apical, or from a sinus; straight, or curved, or flexuous; 2–5.2 mm long overall. Palea 1 length of lemma. Palea keels 0.25 mm apart; scabrous; adorned above.
FLOWER Lodicules 2; lanceolate; 0.5 mm long; veinless; acute. Anthers 3; 2.1–2.7 mm long.
FRUIT Caryopsis with adherent pericarp. Disseminule comprising a floret.
DISTRIBUTION South America: western South America.
NOTES Poeae. Davidse et al 2009.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
