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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.
Aegilops searsii
HABIT Annual; caespitose. Culms geniculately ascending; 10–50 cm long. Leaf-sheath oral hairs lacking. Leaf-sheath auricles falcate. Ligule an eciliate membrane. Leaf-blades flat, or involute; 2–5 cm long; 1.5 mm wide. Leaf-blade surface glabrous.
INFLORESCENCE Inflorescence composed of racemes; deciduous as a whole; embraced at base by subtending leaf.
Racemes 1; single; linear; bilateral; 5–11 cm long; bearing 8–12 fertile spikelets on each. Rhachis tough. Spikelet packing broadside to rhachis. Rhachis internodes oblong; 1 length of fertile spikelet.
Spikelets solitary. Fertile spikelets sessile.
STERILE SPIKELETS Basal sterile spikelets absent, or rudimentary; 0–1 in number.
FERTILE SPIKELETS Spikelets comprising 2 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 12–14 mm long; falling entire; deciduous with accessory branch structures.
GLUMES Glumes similar; shorter than spikelet. Lower glume oblong; 7–8 mm long; 1 length of upper glume; coriaceous; without keels; 6–7 -veined. Lower glume lateral veins distinct; ribbed. Lower glume apex dentate, or lobed; 2 -fid; muticous, or awned, or awned only on distal spikelets; 1 -awned. Lower glume awn 3–10 mm long. Upper glume oblong; 7–8 mm long; 0.8–0.9 length of adjacent fertile lemma; coriaceous; without keels; 6–7 -veined. Upper glume lateral veins distinct; ribbed; parallel at apex. Upper glume apex dentate, or lobed; 2 -fid; muticous, or awned, or awned only on distal spikelets; 1 -awned. Upper glume awn 3–10 mm long.
FLORETS Fertile lemma elliptic; 8–10 mm long; coriaceous; keeled; keeled above; 5 -veined. Lemma apex dentate; 1–2 -fid; awned only on distal spikelets; 2 -awned. Principal lemma awn from a sinus; subterete below; 80–100 mm long overall. Lateral lemma awns arising on apex of lobes; 40–50 mm long. Palea 2 -veined. Palea keels scaberulous. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 2. Anthers 3; 2–3 mm long. Ovary pubescent on apex.
FRUIT Caryopsis with adherent pericarp; hairy at apex. Disseminule comprising a inflorescence.
DISTRIBUTION Asia-temperate: western Asia.
NOTES Triticeae. Fl Pal 1997.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
