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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.
Dasypyrum hordeaceum
HABIT Perennial; culms solitary, or caespitose. Rhizomes elongated. Culms erect; 10–100 cm long. Leaf-sheath oral hairs lacking, or ciliate. Leaf-sheath auricles absent, or falcate. Ligule an eciliate membrane; 0.5–1 mm long; membranous; erose; truncate. Leaf-blades 7–15 cm long; 3–8 mm wide. Leaf-blade surface scabrous; glabrous, or pilose. Leaf-blade margins scabrous; glabrous, or ciliate. Leaf-blade apex attenuate.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 1; single; oblong; bilateral; 3–6 cm long. Rhachis fragile at the nodes; flattened; glabrous on surface; villous on margins. Spikelet packing broadside to rhachis. Rhachis internodes oblong; falling with spikelet above.
Spikelets solitary. Fertile spikelets sessile.
FERTILE SPIKELETS Spikelets comprising 2 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 11–12 mm long; falling entire; deciduous with accessory branch structures.
GLUMES Glumes similar; shorter than spikelet. Lower glume oblong; 5 mm long; 1 length of upper glume; coriaceous; much thinner on margins; 2-keeled; 2–4 -veined. Lower glume primary vein ciliate. Lower glume surface pilose; hairy at base. Lower glume apex truncate, or obtuse; awned; 1 -awned. Lower glume awn 7–13 mm long. Upper glume oblong; 0.5 length of adjacent fertile lemma; coriaceous; with membranous margins; 2-keeled; 2–4 -veined. Upper glume primary vein ciliate. Upper glume lateral veins convergent at apex. Upper glume surface pilose; hairy at base. Upper glume apex truncate, or obtuse; awned; 1 -awned. Upper glume awn 7–13 mm long.
FLORETS Fertile lemma lanceolate, or oblong; 7–8 mm long; coriaceous; keeled; keeled above; 5 -veined. Lemma midvein ciliate. Lemma surface pilose; hairy above; hairy on veins. Lemma apex emarginate, or truncate; awned; 1 -awned. Principal lemma awn 6–12 mm long overall; limb scabrous. Palea lanceolate; 1 length of lemma. Palea keels scabrous. Apical sterile florets 1–3 in number; barren; lanceolate.
FLOWER Lodicules 2; 1.5 mm long. Anthers 3; linear; 7 mm long; yellow, or purple. Ovary pubescent on apex.
FRUIT Caryopsis with adherent pericarp; oblong; laterally compressed; trigonous; sulcate on hilar side; 5–6 mm long; hairy at apex. Embryo 0.25 length of caryopsis. Hilum linear; 1 length of caryopsis.
DISTRIBUTION Europe: southeastern. Africa: north.
NOTES Triticeae. Fl Afr Nord.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
