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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 muticum

HABIT Perennial; caespitose. Butt sheaths pubescent. Culms erect, or geniculately ascending; (6–)15–50(–70) cm long; 2–6 -noded. Leaf-sheath auricles absent. Ligule an eciliate membrane; 0.5–2 mm long. Leaf-blades 3–12 cm long; 1.5–3 mm wide. Leaf-blade surface scabrous; glabrous, or pilose.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; bilateral; 20–90 cm long. Rhachis fragile at the nodes; flattened. Spikelet packing broadside to rhachis; regular; 2 -rowed. Rhachis internodes cuneate; 0.7–1.5 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; lanceolate; dorsally compressed; 4–8 mm long; shorter than fertile; deciduous with the fertile. Companion sterile spikelet glumes 4–8 mm long. Companion sterile spikelet lemmas 1; exserted from glumes; 3.5–4.5 mm long; muticous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension, or with a barren rhachilla extension. Spikelets lanceolate; dorsally compressed; 4–8 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes collateral; similar; reaching apex of florets, or shorter than spikelet; gaping. Lower glume subulate; 4–8 mm long; 1 length of upper glume. Upper glume subulate; 4–8 mm long; 1–1.1 length of adjacent fertile lemma.

FLORETS Fertile lemma elliptic; 4–7 mm long; coriaceous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface scabrous; rough above. Lemma apex acuminate; muticous, or awned; 1 -awned. Principal lemma awn 0–4 mm long overall; limb scabrous. Rhachilla extension 0.7–0.9 length of fertile floret.

FLOWER Lodicules 2; ciliate. Anthers 3; 1–3 mm long. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; sulcate on hilar side; 2.9–3.6 mm long; hairy at apex. Hilum linear.

DISTRIBUTION South America: western South America and southern South America.

NOTES Triticeae. WDC.

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