Flora of North America species comparison

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Heuchera micrantha var. micrantha

Heuchera micrantha var. diversifolia
Photo is of parent taxon

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

crevice alumroot, small-flower alumroot
Leaves

petiole glabrous or long stipitate-glandular;

blade orbiculate to pentagonal, shallowly lobed.

petiole short to long stipitate-glandular;

blade pentagonal or heptagonal, deeply lobed.
Inflorescences

glabrous or sparsely short to medium stipitate-glandular.

sparsely long 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 turbinate to campanulate, 1.5–4.9 × 1.2–3.4 mm, sparsely long stipitate-glandular;

sepals 0.6–1.2 mm, apex acute to mucronate;

petals 0.2–0.7 mm wide;

styles 0.4–3.6 mm.
2n

= 28.

= 14, 28.

Heuchera micrantha var. micrantha

Heuchera micrantha var. diversifolia
Phenology Flowering May–Jun. Flowering May–Jul.
Habitat Evergreen coniferous forests on basalt, schistose shale, metavolcanic, ultra basic, or serpentine-derived soils Mixed coniferous forest on talus, slate, serpentine, basalt, or granite base
Elevation 10-1900 m (0-6200 ft) 100-1900 m (300-6200 ft)
Distribution
from FNA
CA; ID; OR; WA
[BONAP county map]
from FNA
CA; OR; WA; BC
[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 diversifolia occurs in the Coast Ranges, Cascade Range, and Klamath and Santa Lucia mountains.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 91. FNA vol. 8, p. 93.
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. erubescens, H. micrantha var. hartwegii, H. micrantha var. macropetala, H. micrantha var. micrantha
Synonyms H. diversifolia, H. micrantha var. pacifica
Name authority unknown (Rydberg) Rosendahl: Minnesota Stud. Pl. Sci. 2: 42. (1936)
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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