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 chaseana

HABIT Perennial. Basal innovations extravaginal. Culms erect; 15–37 cm long; 2–4 -noded. Leaf-sheaths pilose. Leaf-sheath oral hairs ciliate; 3.5 mm long. Ligule a fringe of hairs; 0.2–0.6 mm long. Leaf-blades 5–11 cm long; 0.8–1.2 mm wide. Leaf-blade surface glabrous.

INFLORESCENCE Inflorescence a panicle, or comprising only a few spikelets; comprising 3–15 fertile spikelets. Peduncle glabrous.

Panicle open; linear; 1.6–6 cm long; bearing few spikelets.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2.5–16.5 mm long; glabrous.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 7–9.2 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.7–1.2 mm long; glabrous. Floret callus evident; 0.4–0.5 mm long; pilose. Floret callus hairs 0.3–1.3 mm long.

GLUMES Glumes persistent; similar; reaching apex of florets, or exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 4–8 mm long; 1.1–1.2 length of upper glume; membranous; without keels; 3 -veined. Lower glume apex acuminate. Upper glume lanceolate; 3.5–6.5 mm long; 0.75–1.2 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma elliptic; 4.5–5.5 mm long; chartaceous; without keel. Lemma surface pubescent; hairy below; with marginal hair tufts; bearing 2 hair tufts in all. Lemma hairs 0.6 mm long. Lemma apex lobed; 2 -fid; with lobes 1.2–2.8 mm long; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; 3.5–5.3 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; 0.3–1.5 mm long; shorter than principal. Palea lanceolate; 3–4 mm long; 2 -veined. Palea surface pilose; hairy on back. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; cuneate; 0.4–0.6 mm long; fleshy; glabrous. Anthers 3; 1.7–2.1 mm long.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 1.5–2 mm long; dark brown. Embryo 0.5 length of caryopsis. Hilum linear; 0.3 length of caryopsis.

DISTRIBUTION South America: Brazil.

NOTES Arundineae. Baezu 1997.

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