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Descriptions

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

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

Aegilops tauschii

HABIT Annual; caespitose. Culms erect, or geniculately ascending; 25–30 cm long. Leaf-sheath oral hairs ciliate. Leaf-sheath auricles falcate. Ligule an eciliate membrane. Leaf-blades 8–17 cm long; 3–5 mm wide. Leaf-blade surface scaberulous; glabrous, or pilose.

INFLORESCENCE Inflorescence composed of racemes; not deciduous as a whole.

Racemes 1; single; linear; smoothly terete; bilateral; 5–10 cm long; 5–8 mm wide; bearing 9–11 fertile spikelets on each. Rhachis fragile at the nodes. Spikelet packing broadside to rhachis. Rhachis internodes oblong; falling with spikelet above.

Spikelets solitary. Fertile spikelets sessile.

STERILE SPIKELETS Basal sterile spikelets absent, or rudimentary; 0–2 in number.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 6–8 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes similar; shorter than spikelet. Lower glume oblong; 5–6 mm long; 1 length of upper glume; coriaceous; without keels; 7–9 -veined. Lower glume lateral veins unequally thickened; ribbed. Lower glume apex with a unilateral tooth; truncate. Upper glume oblong; 5–6 mm long; 0.8–0.9 length of adjacent fertile lemma; coriaceous; without keels; 7–9 -veined. Upper glume lateral veins unequally thickened; ribbed; parallel at apex. Upper glume apex with a unilateral tooth; truncate.

FLORETS Fertile lemma oblong, or ovate; 6–7 mm long; coriaceous; without keel; 5 -veined. Lemma apex entire; truncate; awned, or awned only on distal spikelets; 1 -awned. Principal lemma awn subterete below; 30–40 mm long overall (lower spikelets 0–18). Palea 2 -veined. Palea keels scaberulous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; hairy at apex. Disseminule comprising a rhachis internode.

DISTRIBUTION Europe: eastern. Asia-temperate: Soviet Middle Asia, Caucasus, western Asia, and China. Asia-tropical: India.

NOTES Triticeae. Fl Turk 1993.

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