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.

Aegilops juvenalis

HABIT Annual; caespitose. Culms geniculately ascending; 20–40 cm long. Leaf-sheath oral hairs ciliate. Leaf-sheath auricles falcate. Ligule an eciliate membrane. Leaf-blades 15–30 cm long; 5–10 mm wide. Leaf-blade surface scabrous; rough on both sides; glabrous.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; moniliform, or lanceolate; bilateral; 4–8 cm long; bearing 6 fertile spikelets on each. Rhachis fragile at the nodes. Spikelet packing broadside to rhachis. Rhachis internodes oblong; falling with spikelet alongside.

Spikelets solitary. Fertile spikelets sessile.

STERILE SPIKELETS Basal sterile spikelets rudimentary; 1–2 in number.

FERTILE SPIKELETS Spikelets comprising 4 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 10–15 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes similar; shorter than spikelet. Lower glume elliptic; 7–8 mm long; 1 length of upper glume; coriaceous; without keels; 7–9 -veined. Lower glume lateral veins distinct; ribbed. Lower glume surface pubescent. Lower glume apex dentate; 2 -fid; truncate; awned; 2 -awned. Lower glume awn 6–12 mm long. Upper glume elliptic; 7–8 mm long; 0.8 length of adjacent fertile lemma; coriaceous; without keels; 7–9 -veined. Upper glume lateral veins distinct; ribbed; parallel at apex. Upper glume surface pubescent. Upper glume apex dentate; 2 -fid; truncate; awned; 2 -awned. Upper glume awn 6–12 mm long.

FLORETS Fertile lemma oblong; 8–9 mm long; coriaceous; without keel; 5 -veined. Lemma apex dentate; 2 -fid; truncate; awned; 1 -awned. Principal lemma awn subterete below; 6 mm long overall. 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 Asia-temperate: Soviet Middle Asia and western Asia.

NOTES Triticeae. Fl Iraq 1993.

Please cite this publication as detailed in How to Cite Version: 27th January 2014.