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 montevidensis

HABIT Perennial; caespitose. Basal innovations extravaginal. Culms erect, or geniculately ascending; 30–60 cm long; 3–7 -noded; disarticulating at the nodes. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs; 0.4 mm long. Leaf-blades filiform; convolute; 10–30 cm long; 1–3 mm wide.

INFLORESCENCE Inflorescence a panicle; comprising 5–30 fertile spikelets. Peduncle 6–28 cm long.

Panicle open; elliptic; 4.5–13 cm long; bearing few spikelets. Panicle branches pubescent.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 6–10 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 16–30 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.5–1.5 mm long; bearded. Floret callus hairs 1.5–3 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 16–30 mm long; 1 length of upper glume; membranous; without keels; 5–7 -veined. Lower glume apex acuminate. Upper glume lanceolate; 16–30 mm long; 2.5–3 length of adjacent fertile lemma; membranous; without keels; 5 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma elliptic; 6.7–10.6 mm long; chartaceous; without keel; 7–9 -veined. Lemma surface pilose; hairy below. Lemma hairs 3.5–4.5 mm long. Lemma apex lobed; 2 -fid; incised 0.5 of lemma length; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; 15–22 mm long overall; with twisted column. Column of lemma awn 0.25 length of limb. Lateral lemma awns arising on apex of lobes; 2–7 mm long; shorter than principal. Palea oblanceolate, or obovate; 3.6–5.5 mm long; 2 -veined. Palea keels 1.3–2 mm apart; ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; cuneate; 1.5–3.2 mm long; fleshy; glabrous. Anthers 3; 1.5–3.2 mm long.

FRUIT Caryopsis with adherent pericarp; obovoid; 1.8–2.4 mm long. Hilum linear.

CLEISTOGENES AND VIVIPARY Cleistogenes present; in lower sheaths.

DISTRIBUTION South America: Brazil and southern South America.

NOTES Arundineae. Fl Entre Rios 1993.

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