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FNA | Family List | FNA Vol. 8 | Saxifragaceae | Micranthes

2e. Micranthes nelsoniana (D. Don) Small var. porsildiana (Calder & Savile) Gornall & H. Ohba, J. Bot. Res. Inst. Texas. 2: 395. 2008.

Saxifraga punctata Linnaeus subsp. porsildiana Calder & Savile, Canad. J. Bot. 38: 429. 1960; Micranthes porsildiana (Calder & Savile) Elven & D. F. Murray; S. nelsoniana D. Don subsp. pacifica (Hultén) Hultén; S. nelsoniana var. pacifica (Hultén) H. Ohba; S. nelsoniana subsp. porsildiana (Calder & Savile) Hultén; S. nelsoniana var. porsildiana (Calder & Savile) H. Ohba; S. punctata subsp. pacifica Hultén; S. punctata var. pacifica (Hultén) S. L. Welsh; S. punctata var. porsildiana (Calder & Savile) B. Boivin

Leaf blades thin, not fleshy, margins 12-18-toothed. Inflorescences congested, tangled-ascending hairy. Pistils connate to 3/4 their lengths. Capsules 3-8 mm. 2n = 28.

Flowering summer. Stream banks, wet areas; 0-2500 m; Alta., B.C., N.W.T., Nunavut , Yukon; Alaska.

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.


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