Culms 8-60 cm, usually erect, sometimes decumbent, not disarticulating.
Sheaths glabrous or pilose; blades 5-15 cm long, 0.5-4 mm wide,
usually flat, glabrous or sparsely pilose. Inflorescences with up to 15
spikelets; branches erect; lower branches with 1-3 spikelets. Spikelets
6-15 mm; florets usually cleistogamous, rarely chasmogamous. Calluses
of middle florets from as long as to a little longer than wide, convex abaxially;
lemma bodies 5-6 mm, margins glabrous or pubescent for most of their length,
scabrous apically, apices with acute teeth, teeth often scabrous, sometimes scabridulous,
mucronate, not awned, from between the teeth; palea veins swollen at the
base, forming pulvini; anthers of the cleistogamous florets 0.2-0.4 mm,
those of the chasmogamous florets about 2 mm. Caryopses 2.1-2.5 mm long,
1.1-1.8 mm wide. 2n = 24, 36, 124.
Danthonia decumbens grows throughout most of Europe, the Caucasus, and
northern Turkey, and is now established on the west and east coasts of North America.
It grows in heath lands, sandy or rocky meadows, clearings, and sometimes along
roadsides. The species is sometimes placed in the monotypic genus Sieglingia,
as Sieglingia decumbens (L.) Bernh.
Culms 2-5 dm; lvs 1-3 mm wide; raceme 2-4 cm, with 3-8 pediceled spikelets; glumes rounded below, keeled distally, 7-11 mm, the first slightly the longer; lemmas 4-6 mm, minutely 3-toothed; 2n=18, 24, 36, 124. Boggy or peaty soil; Europe; also in Nf. and N.S., where possibly native. (Sieglingia d.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.