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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 intercedens

HABIT Perennial; caespitose; clumped loosely. Culms erect, or geniculately ascending; 5–40 cm long. Culm-nodes pubescent. Leaf-sheaths pilose. Leaf-sheath auricles absent, or falcate; 0.5–1.5 mm long. Ligule an eciliate membrane; 0.3–0.8 mm long. Leaf-blades 5–9 cm long; 2–4 mm wide. Leaf-blade surface pilose; sparsely hairy, or moderately hairy, or densely hairy; hairy on both sides.

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

Racemes 1; single; linear; bilateral; 2.5–6.2 cm long; 4–6 mm wide. Rhachis fragile at the nodes; flattened. Spikelet packing broadside to rhachis. Rhachis internodes oblong; falling with spikelet above.

Spikelets in threes. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 2 in the cluster.

STERILE SPIKELETS Companion sterile spikelets well-developed; containing empty lemmas, or male; linear; 17.5 mm long; as long as fertile; deciduous with the fertile. Companion sterile spikelet glumes subulate; 17.5 mm long. Companion sterile spikelet lemmas 1; 1.7–4.4 mm long; muticous, or 1-awned; with 1.2 mm long awn.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; dorsally compressed; 4.5–7.5 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes collateral; similar; exceeding apex of florets; gaping. Lower glume subulate; 17 mm long; 1 length of upper glume. Upper glume subulate; 17 mm long.

FLORETS Fertile lemma lanceolate; 4.5–7.5 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent; hairy below. Lemma apex acuminate; muticous, or awned; 1 -awned. Principal lemma awn 5.6–9.8 mm long overall.

FLOWER Anthers 3; 0.6–1.2 mm long. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; hairy at apex. Hilum linear.

DISTRIBUTION North America: southwest USA and Mexico.

NOTES Triticeae. Fl N Amer 2007.

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