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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 intermedia

HABIT Perennial; caespitose. Culms erect; 10–50 cm long; disarticulating at the nodes. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs bearded. Ligule a fringe of hairs. Leaf-blades involute; 5–20 cm long; 1–2 mm wide. Leaf-blade surface glabrous, or pilose; sparsely hairy.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; lanceolate; 2–5 cm long; bearing few spikelets. Primary panicle branches appressed; bearing 1 fertile spikelets on each lower branch.

Spikelets appressed; solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets with diminished florets at the apex. Spikelets elliptic; laterally compressed; 15 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; pilose.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 15 mm long; 1 length of upper glume; membranous; without keels; 3 -veined. Lower glume apex acute. Upper glume lanceolate; 15 mm long; 2 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 7–8 mm long; chartaceous; without keel; 5 -veined. Lemma margins ciliate; hairy below. Lemma apex lobed; 2 -fid; incised 0.5 of lemma length; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; 7–9 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; 1–2 mm long; shorter than principal. Palea 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 Asia-temperate: Soviet far east. North America: Subarctic, western Canada, eastern Canada, northwest USA, north-central USA, southwest USA, and south-central USA.

NOTES Arundineae. Man US Gr 1993.

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