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Descriptions

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

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

Danthonia chiapasensis

HABIT Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms erect; 40–60 cm long. Leaves basal and cauline. Leaf-sheaths without keel; glabrous on surface. Leaf-sheath oral hairs ciliate; 0.7–1.1 mm long. Ligule a fringe of hairs; 0.5–1.5 mm long. Leaf-blades involute; 20–45 cm long; 2–5 mm wide. Leaf-blade surface ribbed; grooved adaxially; glabrous, or pilose; sparsely hairy.

INFLORESCENCE Inflorescence a panicle.

Panicle open; linear; 8–13 cm long; 1.5 cm wide. Primary panicle branches ascending; 3–7 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 5–6 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 17–21 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; pilose. Floret callus hairs 0.5–1 mm long.

GLUMES Glumes persistent; similar; reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate; 17–21 mm long; 1 length of upper glume; membranous; without keels; 3–5 -veined. Lower glume apex acuminate. Upper glume lanceolate; 17–21 mm long; 1.4–1.5 length of adjacent fertile lemma; membranous; without keels; 3–5 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma elliptic; 12–14 mm long; chartaceous; without keel; 9 -veined. Lemma surface pilose; hairy below. Lemma margins ciliate; hairy below. Lemma apex lobed; 2 -fid; with lobes 8–9.5 mm long; incised 0.66 of lemma length; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; flat below; 20–25 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; shorter than principal. Palea 6 mm long; 2 -veined. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; obovate; fleshy; ciliate. Anthers 3; 1.7–3.4 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION North America: Mexico.

NOTES Arundineae. Davidse 1994.

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