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.

Danthonia holm-nielsenii

HABIT Perennial; caespitose; clumped densely. Butt sheaths glossy; glabrous. Culms slender; 25 cm long. Leaf-sheaths mostly shorter than adjacent culm internode; pilose. Leaf-sheath oral hairs ciliate; 1–1.5 mm long. Ligule a fringe of hairs; 0.3–0.5 mm long. Leaf-blades filiform; involute; 3–5 cm long; 1.5 mm wide. Leaf-blade surface ribbed; hispid; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate, or elliptic; 5 cm long. Primary panicle branches 1 -nate. Panicle branches pilose.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 7–8 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 15–17 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.8 mm long; pubescent. Floret callus hairs 0.2–0.4 mm long.

GLUMES Glumes persistent; similar; reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate; 15–17 mm long; 1 length of upper glume; membranous; without keels; 3–5 -veined. Lower glume lateral veins obscure. Lower glume apex acuminate. Upper glume lanceolate; 15–17 mm long; 3 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume lateral veins obscure. Upper glume apex acuminate.

FLORETS Fertile lemma elliptic to ovate; 5–6 mm long; chartaceous; without keel; 5 -veined. Lemma apex lobed; 2 -fid; with lobes 2–3 mm long; incised 0.5 of lemma length; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; flat below; 10–12 mm long overall; with twisted column. Column of lemma awn 2 mm long. Lateral lemma awns arising on apex of lobes; 4–5 mm long; shorter than principal. Palea 3 mm long; 2 -veined. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; cuneate; fleshy; glabrous. Anthers 3.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

CLEISTOGENES AND VIVIPARY Cleistogenes present; in lower sheaths.

DISTRIBUTION South America: western South America.

NOTES Arundineae. Laegaard 2001.

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