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Descriptions

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

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

Hordeum cordobense

HABIT Perennial; caespitose. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms erect; 70–80 cm long; 3–6 -noded. Culm-nodes glabrous. Leaf-sheath auricles absent. Ligule an eciliate membrane; 0.4–1.5 mm long. Leaf-blades 5–13 cm long; 1.7–4.4 mm wide. Leaf-blade surface scabrous; glabrous, or pubescent; hairy adaxially.

INFLORESCENCE Inflorescence composed of racemes; exserted, or embraced at base by subtending leaf.

Racemes 1; single; linear; bilateral; 5–10 cm long; 3–4 mm wide. Rhachis fragile at the nodes; narrowly winged; flattened; scabrous on surface; ciliate on margins. Spikelet packing broadside to rhachis. Rhachis internodes oblong; 1.2–1.8 mm long; falling with spikelet above.

Spikelets in threes. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 2 in the cluster. Pedicels oblong; 1–2.5 mm long.

STERILE SPIKELETS Companion sterile spikelets well-developed; containing empty lemmas, or male (rarely); lanceolate; dorsally compressed; 3.7–7 mm long; shorter than fertile; deciduous with the fertile. Companion sterile spikelet glumes subulate. Companion sterile spikelet lemmas 1; 4 mm long; muticous (mucronate).

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 5–8 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes collateral; similar. Lower glume linear; 4–6.5 mm long; 1 length of upper glume. Lower glume surface scabrous. Upper glume linear; 4–6.5 mm long. Upper glume surface scabrous.

FLORETS Fertile lemma lanceolate; 5–8 mm long; coriaceous; without keel; 7–9 -veined. Lemma lateral veins prominent. Lemma apex acuminate; muticous, or awned; 1 -awned. Principal lemma awn 1.5–5 mm long overall; limb scabrous.

FLOWER Anthers 3; 1.8–3 mm long. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; sulcate on hilar side; hairy at apex. Hilum linear.

DISTRIBUTION South America: southern South America.

NOTES Triticeae. Bothmer 1993.

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