Danthonia decumbens

(L.) DC.
Common names: Mountain heath-grass
Introduced
Synonyms: Sieglingia decumbens
Treatment appears in FNA Volume 25. Treatment on page 302.

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.

Distribution

B.C., Nfld. and Labr. (Labr.), N.S., Calif., Oreg., Wash.

Discussion

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 heathlands, sandy or rocky meadows, clearings, and sometimes along roadsides. The species is sometimes placed in the monotypic genus Sieglingia, as Sieglingia decumbens (L.) Bernh.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number."pubescent" is not a number. "glabrous" is not a number.

... more about "Danthonia decumbens"
124 +, 36 +  and 24 +
obtuse +, awned +  and mucronate +
Stephen J. Darbyshire +
(L.) DC. +
1 (?) +  and 3 (?) +
geniculate +
pilose +  and glabrous +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
not pseudopetiolate +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
pilose +  and glabrous +
involute +, flat +  and rolled +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
hirsute +  and scabrous +
spikelike +
than from as-long-as to a little longer wide +
0.21 cm2.1 mm <br />0.0021 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
flattened +, ovate +  and obovate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
not disarticulating +
Mountain heath-grass +
not disarticulating +
perennial +  and annual +
8 cm80 mm <br />0.08 m <br /> (60 cm600 mm <br />0.6 m <br />) +
woody +  and herbaceous +
B.C. +, Nfld. and Labr. (Labr.) +, N.S. +, Calif. +, Oreg. +  and Wash. +
small +  and large +
capillary +
2 cm20 mm <br />0.02 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
sometimes longer +
1 +, 3 +  and 12 +
chasmogamous +  and cleistogamous +
compressed +
cleistogamous +  and chasmogamous +
(1)3-7-veined +
subtending +
subequal +
non-uncinate +
1/3 +  and 3/4 +
spicate +  and ebracteate +
racemose +  and paniculate +
solid +  and hollow +
scabrous +  and glabrous +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
scabrous +  and glabrous +
rounded +
coriaceous +
acute +  and aristate +
inconspicuous +
with a few hairs +  and glabrous +
extended +
concealed +  and prominent +
2 +  and 1 +
well-developed +
sometimes slightly longer +
hirsute +  and scabrous +
dry +  and fleshy +
0 cm0 mm <br />0 m <br /> (12 cm120 mm <br />0.12 m <br />) +
hirsute +  and scabrous +
pilose +  and glabrous +
Introduced +
sterile +, bisexual +  and unisexual +
compressed +  and terete +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
1 +  and 3 +
2 (?) +  and 3 (?) +
Sieglingia decumbens +
Danthonia decumbens +
Danthonia +
species +
membranous +
scabridulous +
mucronate +  and acute +
plant +  and cespitose +
aquatic +  and terrestrial +