Flora of North America species comparison

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Heuchera micrantha var. micrantha

Heuchera micrantha var. erubescens
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 or heptagonal, 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 obconic, 1.7–3.1 × 1–2.3 mm (1.4 times longer than wide), short stipitate-glandular;

sepals 0.5–1.8 mm, apex acute;

petals 0.2–0.6 mm wide;

styles 0.2–0.6 mm.
2n

= 28.

= 14.

Heuchera micrantha var. micrantha

Heuchera micrantha var. erubescens
Phenology Flowering May–Jun. Flowering Jun–Jul.
Habitat Evergreen coniferous forests on basalt, schistose shale, metavolcanic, ultra basic, or serpentine-derived soils Mixed evergreen forest on limestone, mica schist, granite, or serpentine soils
Elevation 10-1900 m (0-6200 ft) 100-2200 m (300-7200 ft)
Distribution
from FNA
CA; ID; OR; WA
[BONAP county map]
from FNA
CA
[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 erubescens occurs in the Klamath Mountains, middle Sierra Nevada, and Diablo and Santa Lucia mountains.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 91. FNA vol. 8, p. 92.
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. hartwegii, H. micrantha var. macropetala, H. micrantha var. micrantha
Synonyms H. erubescens
Name authority unknown (A. Braun & C. D. Bouché) Rosendahl: Bot. Jahrb. Syst. 37(2, Beibl. 83): 77. (1905)
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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