GrassBase - The Online World Grass Flora


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

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

Hordeum chilense

HABIT Perennial; caespitose. Butt sheaths pubescent; persistent and investing base of culm; with compacted dead sheaths, or fibrous dead sheaths. Culms geniculately ascending; 20–80 cm long. Leaf-sheath auricles absent. Ligule an eciliate membrane; 0.4–1.8 mm long. Leaf-blades 4–17 cm long; 2–5 mm wide. Leaf-blade surface smooth, or scaberulous; glabrous, or pilose.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; linear; bilateral; 4–8 cm long; 4–7 mm wide. Rhachis fragile at the nodes; narrowly winged; flattened; ciliate on margins. Spikelet packing broadside to rhachis. Rhachis internodes oblong; 1.2–2.3 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.

STERILE SPIKELETS Companion sterile spikelets well-developed; containing empty lemmas; lanceolate; dorsally compressed; 10–22 mm long; shorter than fertile; deciduous with the fertile. Companion sterile spikelet glumes subulate. Companion sterile spikelet lemmas 1; 1.3–1.7 mm long; muticous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; dorsally compressed; 6.5–11.7 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes collateral; similar; gaping. Lower glume linear; 4.2–7.5 mm long; 1 length of upper glume. Lower glume surface scabrous. Lower glume apex awned; 1 -awned. Lower glume awn 4–18 mm long. Upper glume linear; 4.3–7.5 mm long. Upper glume surface scabrous. Upper glume awned; 1 -awned. Upper glume awn 4–18 mm long.

FLORETS Fertile lemma lanceolate; 6.5–11.7 mm long; coriaceous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface scabrous; rough above. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 4–12.5 mm long overall; limb scabrous. Rhachilla extension 2–7 mm long.

FLOWER Anthers 3; 1.3–3 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.