Flora of North America species comparison

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Heuchera micrantha var. micrantha

Heuchera micrantha var. macropetala
Photo is of parent taxon

crevice alumroot, small-flower alumroot
Photo is of parent taxon

crevice alumroot
Leaves

petiole glabrous or long stipitate-glandular;

blade orbiculate to pentagonal, shallowly lobed.

petiole short stipitate-glandular or sparsely long stipitate-glandular;

blade pentagonal, deeply lobed.
Inflorescences

glabrous or sparsely short to medium stipitate-glandular.

short stipitate-glandular.
Flowers

hypanthium obconic, 1.4–4.5 × 1–3.7 mm, short to long stipitate-glandular;

sepals 0.6–1.2 mm, apex rounded to acute;

petals 0.2–0.7 mm wide;

styles 1.6–3.1 mm.

hypanthium hemispheric, 1–3.5 × 1–3.5 mm (1 times long as wide), short stipitate-glandular;

sepals 0.5–1.5 mm, apex broadly rounded;

petals 0.4–1.4 mm wide;

styles 1.2–3.9 mm.
2n

= 28.

Heuchera micrantha var. micrantha

Heuchera micrantha var. macropetala
Phenology Flowering May–Jun. Flowering Apr–Jun.
Habitat Evergreen coniferous forests on basalt, schistose shale, metavolcanic, ultra basic, or serpentine-derived soils Mixed evergreen forest on limestone or serpentine-derived soils
Elevation 10-1900 m (0-6200 ft) 100-1800 m (300-5900 ft)
Distribution
from FNA
CA; ID; OR; WA
[BONAP county map]
from FNA
CA; OR
[BONAP county map]
Discussion

Variety micrantha occurs in the Coast Range, Cascade Range, Blue and Klamath mountains, northern Sierra Nevada, and the Columbia River gorge, and on wooded banks of the Columbia and its tributaries.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Variety macropetala is known from the Klamath and Siskiyou mountains.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 91. FNA vol. 8, p. 91.
Parent taxa Saxifragaceae > Heuchera > Heuchera micrantha Saxifragaceae > Heuchera > Heuchera micrantha
Sibling taxa
H. micrantha var. diversifolia, H. micrantha var. erubescens, H. micrantha var. hartwegii, H. micrantha var. macropetala
H. micrantha var. diversifolia, H. micrantha var. erubescens, H. micrantha var. hartwegii, H. micrantha var. micrantha
Name authority unknown Shipes & E. F. Wells: Rhodora 98: 366. (1997)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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