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.

Deyeuxia hieronymii

HABIT Perennial; caespitose. Culms erect; 40–60 cm long. Culm-internodes scaberulous. Leaf-sheaths 15–25 cm long; glabrous on surface. Ligule an eciliate membrane; 1.5–2 mm long; erose; obtuse. Leaf-blades flat, or convolute; 20–60 cm long; 1–4.7 mm wide. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; dense; 10–20 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.8–4.3 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acute. Upper glume lanceolate; 3.5–4 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface asperulous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3.8–4.3 mm long; membranous; without keel; 3 -veined. Lemma midvein ciliolate. Lemma surface pubescent. Lemma apex erose; obtuse; mucronate, or awned; 1 -awned. Principal lemma awn subapical; straight; 1 mm long overall. Palea 1 length of lemma. Palea keels scabrous. Rhachilla extension 1.5–2 mm long; pilose.

FLOWER Lodicules 2. Anthers 3; 1.8–2 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; lanceolate; 1.5–1.8 mm long. Hilum punctiform. Disseminule comprising a floret.

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

NOTES Aveneae. Turpe 1995.

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