Flora of North America species comparison

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Heuchera micrantha var. hartwegii

Heuchera micrantha var. micrantha
Photo is of parent taxon

Hartweg's alumroot, Hartweg's small-flower alumroot
Photo is of parent taxon

crevice alumroot, small-flower alumroot
Leaves

petiole short stipitate-glandular mixed with long stipitate-glandular;

blade pentagonal or heptagonal, deeply lobed.

petiole glabrous or long stipitate-glandular;

blade orbiculate to pentagonal, shallowly lobed.
Inflorescences

long stipitate-glandular.

glabrous or sparsely short to medium stipitate-glandular.
Flowers

hypanthium broadly turbinate, 1.5–4.7 × 1.5–3.8 mm, long stipitate-glandular;

sepals 0.5–1.3 mm, apex rounded to acute;

petals 0.3–0.7 mm wide;

styles 1.8–4.2 mm.

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.
2n

= 14, 28.

= 28.

Heuchera micrantha var. hartwegii

Heuchera micrantha var. micrantha
Phenology Flowering Apr–Jul. Flowering May–Jun.
Habitat Redwood or pine forest over sandstone, granite, or serpentine soils Evergreen coniferous forests on basalt, schistose shale, metavolcanic, ultra basic, or serpentine-derived soils
Elevation 0-1600 m (0-5200 ft) 10-1900 m (0-6200 ft)
Distribution
from FNA
CA; OR; WA
[BONAP county map]
from FNA
CA; ID; OR; WA
[BONAP county map]
Discussion

Variety hartwegii occurs in the Coast Ranges.

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

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.)
Source FNA vol. 8, p. 92. 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. macropetala, H. micrantha var. micrantha
H. micrantha var. diversifolia, H. micrantha var. erubescens, H. micrantha var. hartwegii, H. micrantha var. macropetala
Synonyms H. pilosissima var. hartwegii, H. hartwegii
Name authority (S. Watson ex Wheelock) Rosendahl: Bot. Jahrb. Syst. 37(2, Beibl. 83): 77. (1905) unknown
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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