Flora of North America species comparison

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Micranthes nelsoniana var. porsildiana

Micranthes nelsoniana var. nelsoniana
Photo is of parent taxon

dotted saxifrage
Photo is of parent taxon
Leaf

blades thin, not fleshy, margins 12–18-toothed.

blades slightly fleshy, margins 15–21-toothed.
Inflorescences

congested, tangled-ascending hairy.

Pistils

connate to 3/4 their lengths.

connate most of their lengths.
Capsules

3–8 mm.

3–8 mm.
In

-florescences usually congested, purple- or brown-tipped, erect stipitate-glandular.
2n

= 28.

= ca. 80, ca. 84.

Micranthes nelsoniana var. porsildiana

Micranthes nelsoniana var. nelsoniana
Phenology Flowering summer. Flowering summer.
Habitat Stream banks, wet areas Arctic tundra, mountain stream banks
Elevation 0-2500 m (0-8200 ft) 0-1200 m (0-3900 ft)
Distribution
from FNA
AK; AB; BC; NT; NU; YT
from FNA
AK; NT; YT; e Asia (Russian Far East)
[BONAP county map]
Discussion

The characters used by J. A. Calder and D. B. O. Savile (1960) to separate var. porsildiana from var. pacifica overlap more significantly than do the characters that separate their subspecies, although inland populations of what has been called var. porsildiana gradually tend away from the morphology typical of coastal populations. Elven and Murray treated this taxon as a species distinct from Micranthes nelsoniana, because it apparently grows in stands mixed with other subspecies of M. nelsoniana without forming intermediates. The entire complex needs a thorough re-examination.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 56. FNA vol. 8, p. 55.
Parent taxa Saxifragaceae > Micranthes > Micranthes nelsoniana Saxifragaceae > Micranthes > Micranthes nelsoniana
Sibling taxa
M. nelsoniana var. carlottae, M. nelsoniana var. cascadensis, M. nelsoniana var. insularis, M. nelsoniana var. nelsoniana
M. nelsoniana var. carlottae, M. nelsoniana var. cascadensis, M. nelsoniana var. insularis, M. nelsoniana var. porsildiana
Synonyms Saxifraga punctata subsp. porsildiana, M. porsildiana, Saxifraga nelsoniana subsp. pacifica, Saxifraga nelsoniana var. pacifica, Saxifraga nelsoniana subsp. porsildiana, Saxifraga nelsoniana var. porsildiana, Saxifraga punctata subsp. pacifica, Saxifraga punctata var. pacifica, Saxifraga punctata var. porsildiana
Name authority (Calder & Savile) Gornall & H. Ohba: J. Bot. Res. Inst. Texas 2: 395. (2008) 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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