''Tolmiea'' is a genus of flowering plants in the saxifrage family containing two species native to northwestern North America. The genus was formerly considered to be

monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unisp ...

until diploid populations were split off as ''T. diplomenziesii'' from the tetraploid populations of ''T. menziesii''. The genus was named after the Scottish-Canadian botanist

William Fraser Tolmie William Fraser Tolmie ( "Dr. Tolmie") (February 3, 1812 – December 8, 1886) was a surgeon, fur trader, scientist, and politician. He was born in Inverness, Scotland, in 1812, and by 1833 moved to the Pacific Northwest in the service of ...

Species

Two species are accepted. *'' Tolmiea diplomenziesii'' – California and Oregon *''

Tolmiea menziesii ''Tolmiea menziesii'' () is a species of flowering plant in the family Saxifragaceae. It is known by the common names youth on age, pick-a-back-plant, piggyback plant, and thousand mothers. It is a perennial plant native to the West Coast of Nort ...

'' – Alaska, British Columbia, Oregon, and Washington

References

Saxifragaceae Saxifragaceae genera Flora of the West Coast of the United States Flora of California Flora of Oregon Flora of Washington (state) Flora of Alaska Garden plants of North America House plants Groundcovers Taxa named by Asa Gray Taxa named by John Torrey {{Saxifragaceae-stub