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 pubiflorum

HABIT Perennial. Culms geniculately ascending; 10–40 cm long; 1–3 -noded. Leaf-sheaths glabrous on surface, or pubescent. Ligule an eciliate membrane; truncate. Leaf-blades flat, or convolute; 1.5–2 mm wide. Leaf-blade surface pubescent.

INFLORESCENCE Inflorescence composed of racemes. Peduncle glabrous, or pubescent above.

Racemes 1; single; bilateral; 3–6 cm long. Rhachis fragile at the nodes; flattened; pubescent on margins. Rhachis hairs 0.6 mm long. Spikelet packing broadside to rhachis. Rhachis internodes oblong; 0.9–1 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; 0.5–0.7 mm long; ciliate.

STERILE SPIKELETS Companion sterile spikelets well-developed; containing empty lemmas; lanceolate; dorsally compressed; 18–20 mm long; as long as fertile; persistent. Companion sterile spikelet glumes similar in width; subulate; 18–20 mm long; pubescent. Companion sterile spikelet lemmas 1; 4–7 mm long; 1-awned.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; dorsally compressed; 18–25 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes collateral; similar; exceeding apex of florets; gaping. Lower glume subulate; 18–25 mm long; 1 length of upper glume; coriaceous. Lower glume surface pubescent. Upper glume subulate; 18–25 mm long; coriaceous. Upper glume surface pubescent.

FLORETS Fertile lemma lanceolate; 7.5–10 mm long; coriaceous; purple; without keel; 5 -veined. Lemma surface pubescent; hairy all along, or above. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 10–16 mm long overall. Palea 1 length of lemma. Palea keels ciliate. Rhachilla extension 6–8 mm long; pilose.

FLOWER Lodicules 2; 0.7–1.3 mm long; ciliate. Anthers 3; 1–1.5 mm long. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; 2.5–3.5 mm long; hairy at apex. Hilum linear.

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

NOTES Triticeae. Fl Pat 1995.

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