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Descriptions

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

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

Alopecurus aucheri

HABIT Perennial. Rhizomes elongated. Butt sheaths glabrous; persistent and investing base of culm; with reticulate dead sheaths. Culms erect; 20–60 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 2 mm long; obtuse. Leaf-blades 3–15 cm long; 2–5 mm wide. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle; subtended by an inflated leaf-sheath.

Panicle spiciform; elliptic, or oblong; 1.3–2.5 cm long; 1–1.5 cm wide. Primary panicle branches accrescent to a central axis; with evident branchlets on axis. Panicle axis with rounded ribs.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels oblong.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 4.5–5 mm long; falling entire.

GLUMES Glumes connate along margins below; 0.1 of their length connate; similar; exceeding apex of florets. Lower glume lanceolate; 4.5–5 mm long; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein ciliate. Lower glume surface pilose. Lower glume apex acuminate; awned; 1 -awned. Lower glume awn 1–2 mm long. Upper glume lanceolate; 4.5–5 mm long; 1.5 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein ciliate. Upper glume surface pilose. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 1–2 mm long.

FLORETS Fertile lemma oblong; 3–4 mm long; membranous; keeled; 5 -veined. Lemma margins connate below. Lemma apex erose; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33 way up back of lemma; straight, or geniculate; 6.5–10 mm long overall; clearly exserted from spikelet; without a column, or with twisted column. Palea absent or minute.

FLOWER Lodicules absent. Anthers 3; 1.8–2.7 mm long. Stigmas terminally exserted; pubescent. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a spikelet.

DISTRIBUTION Asia-temperate: Caucasus and western Asia.

NOTES Aveneae. Fl Turk 1993.

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