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Descriptions

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

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

Koeleria calderonii

HABIT Perennial; caespitose. Rhizomes short. Culms geniculately ascending; 7–21 cm long; 1–2 -noded. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths pubescent. Ligule a ciliolate membrane; 1–1.5 mm long; truncate, or acute. Leaf-blades 4–10 cm long; 1.5–2 mm wide. Leaf-blade surface pubescent; densely hairy.

INFLORESCENCE Inflorescence a panicle; exserted, or embraced at base by subtending leaf. Peduncle pubescent above.

Panicle spiciform; linear; interrupted; 3–5.5 cm long; 0.7–1 cm wide. Panicle axis pubescent.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with a barren rhachilla extension. Spikelets cuneate; laterally compressed; 4–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.8–1.5 mm long; pubescent. Floret callus sparsely hairy.

GLUMES Glumes persistent; similar; shorter than spikelet; similar to fertile lemma in texture; shiny; gaping. Lower glume lanceolate; 4.5–5 mm long; 0.8–0.9 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein scaberulous (above). Lower glume apex acuminate. Upper glume lanceolate; 4.5–5 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous (above). Upper glume apex acute.

FLORETS Fertile lemma elliptic; 4–5.5 mm long; membranous; shiny; keeled; 5 -veined. Lemma lateral veins obscure; stopping well short of apex. Lemma surface scabrous. Lemma apex acute; awned; 1 -awned. Principal lemma awn subapical; curved; 1–2 mm long overall. Palea gaping. Palea keels scaberulous.

FLOWER Lodicules 2; 1 mm long; membranous. Anthers 3; 1–1.5 mm long; yellow, or purple.

FRUIT Caryopsis with adherent pericarp; ellipsoid; laterally compressed; 2–2.5 mm long. Hilum elliptic. Endosperm liquid.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. Molina 2005.

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