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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 patagonicum

HABIT Perennial; caespitose. Culms 3–10 cm long; 1–2 -noded. Leaf-sheaths glabrous on surface. Ligule a ciliolate membrane; 0.3–0.4 mm long. Leaf-blades curved; filiform; 1–3 cm long; 0.5–1 mm wide; stiff; glaucous. Leaf-blade surface scabrous.

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

Racemes 1; single; bilateral; 1.5–2 cm long. Rhachis fragile at the nodes; flattened; ciliate on margins. Spikelet packing broadside to rhachis. Rhachis internodes oblong; 0.5 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; curved; 0.5–0.6 mm long; puberulous.

STERILE SPIKELETS Companion sterile spikelets well-developed; containing empty lemmas; lanceolate; dorsally compressed; 7–9 mm long; as long as fertile; deciduous with the fertile. Companion sterile spikelet glumes similar in width; subulate; 7–9 mm long. Companion sterile spikelet lemmas 1; 3 mm long; muticous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; dorsally compressed; 7–9 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes collateral; similar; exceeding apex of florets; gaping. Lower glume subulate; 7–9 mm long; 1 length of upper glume; coriaceous. Lower glume surface puberulous. Upper glume subulate; 7–9 mm long; coriaceous. Upper glume surface puberulous.

FLORETS Fertile lemma lanceolate; 5–6 mm long; coriaceous; dull; without keel; 5 -veined. Lemma surface puberulous; hairy all along. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 3–4 mm long overall. Palea 4.5–5 mm long. Palea surface scabrous.

FLOWER Lodicules 2; 0.75–0.85 mm long; glabrous. Anthers 3; 1.1–1.3 mm long. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; 2.5 mm long; hairy at apex. Hilum linear.

DISTRIBUTION South America: southern South America.

NOTES Triticeae. Fl Pat 1995.

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