Micranthes howellii

(Greene) Small in N. L. Britton et al.

in N. L. Britton et al., N. Amer. Fl. 22: 140. 1905,.

Basionym: Saxifraga howellii Greene Pittonia 2: 163. 1891
Treatment appears in FNA Volume 8. Treatment on page 63. Mentioned on page 54.

Plants solitary or in groups, with bulbils on caudices. Leaves basal; petiole flattened, 1–4 cm; blade oblong to narrowly ovate, 1–2 (–3) cm, ± fleshy, base attenuate, margins sharply serrate, eciliate, surfaces sparsely tangled, reddish brown-hairy abaxially, glabrous adaxially. Inflorescences 5–10 (–20) -flowered, very open, lax, ± flat-topped cymes or thyrses, 5–10 (–20) cm, glabrate to sparsely purple-tipped stipitate-glandular; (bracts glabrous). Flowers: sepals strongly reflexed, elliptic, (surfaces glabrous); petals white, not spotted, obovate to elliptic, clawed, 2.5–4.5 mm, longer than sepals; filaments linear, flattened; pistils distinct almost to base; ovary ± superior. Capsules purple, valvate.


Phenology: Flowering early spring–early summer.
Habitat: Wet, rocky ledges and crevices
Elevation: 0-900 m

Discussion

Selected References

None.

Lower Taxa

None.

"full" is not a number.

... more about "Micranthes howellii"
epigynous +, perigynous +  and hypogynous +
palmate +  and pinnate +
acute +  and obtuse or rounded +
Luc Brouillet +  and Patrick E. Elvander† +
(Greene) Small in N. L. Britton et al. +
attenuate +
Saxifraga howellii +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
dentate +, serrate +  and entire +
glandular-ciliate +  and ciliate +
oblong +  and narrowly ovate +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
2(-3)-beaked +  and folliclelike +
3-carpellate +  and 2-carpellate +
connate +  and distinct +
ebracteate +, bracteate +  and 2-300(-1000+)-flowered +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
flat-topped +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Calif. +  and Oreg. +
0-900 m +
flattened +
bracteate +  and 2-70+[-1000]-flowered +
unisexual +  and bisexual +
2 cm20 mm <br />0.02 m <br /> (125 cm1,250 mm <br />1.25 m <br />) +
2-3(-4)-beaked +  and folliclelike +
Wet, rocky ledges and crevices +
multicellular +
glabrous +, stipitate-glandular +  and hairy +
purplish +  and green +
free +  and adnate +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
open +  and 5-10(-20)-flowered +
opposite +  and alternate +
crassinucellate +, unitegmic +  and bitegmic +
epigynous +, perigynous +  and hypogynous +
purple-margined +
not spotted +  and white +
reddish purple +  and purple +
distinct +
clawed +, obovate +  and elliptic +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
peltate +  and jointed +
flattened +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Flowering early spring–early summer. +
2(-3)-carpellate +
unequal +
in N. L. Britton et al., N. Amer. Fl. +
straight +
muricate +, cellular-rugulose +, tuberculate +, pitted +, papillate +  and wrinkled +
ovoid +, ellipsoid +  and oblong +
reddish +  and green +
distinct +
unbranched +  and branched +
persistent +
horizontal +  and erect +
2 +  and 3 +
connate +  and distinct +
reddish brown-hairy +
Micranthes howellii +
Micranthes +
species +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
glabrate +  and sparsely purple-tipped stipitate-glandular +
flat-topped +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
dentate +, serrate +  and entire +
stoloniferous +  and rhizomatous +
annual +, biennial +  and perennial +