Flora of North America species comparison

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Heuchera micrantha var. hartwegii

Heuchera micrantha var. macropetala
Photo is of parent taxon

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

crevice alumroot
Leaves

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

blade pentagonal or heptagonal, deeply lobed.

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

blade pentagonal, deeply lobed.
Inflorescences

long stipitate-glandular.

short 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 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

= 14, 28.

Heuchera micrantha var. hartwegii

Heuchera micrantha var. macropetala
Phenology Flowering Apr–Jul. Flowering Apr–Jun.
Habitat Redwood or pine forest over sandstone, granite, or serpentine soils Mixed evergreen forest on limestone or serpentine-derived soils
Elevation 0-1600 m (0-5200 ft) 100-1800 m (300-5900 ft)
Distribution
from FNA
CA; OR; WA
[BONAP county map]
from FNA
CA; OR
[BONAP county map]
Discussion

Variety hartwegii occurs in the Coast Ranges.

(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. 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. micrantha
Synonyms H. pilosissima var. hartwegii, H. hartwegii
Name authority (S. Watson ex Wheelock) Rosendahl: Bot. Jahrb. Syst. 37(2, Beibl. 83): 77. (1905) 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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