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Penthoraceae Rydberg ex Britton. Penthorum Family.

A family of one genus and 2 species, herbs, of e. North America and e. Asia. Penthorum has been variously placed in the Crassulaceae, Saxifragaceae, or in the Penthoraceae. Haskins & Hayden (1987) concluded that Penthorum was best treated in a monogeneric Penthoraceae, a conclusion based on extensive anatomical evidence. Among those who do not favor a monotypic family, there is nearly evenly divided opinion between the Crassulaceae and Saxifragaceae; this in itself perhaps supports segregation in the Penthoraceae. Molecular evidence supports the recognition of the Penthoraceae, and suggests closer affinities with the Haloragaceae than with either the Crassulaceae or the Saxifragaceae (Morgan & Soltis 1993).

Ref: Freeman (2009a) In Flora of North America Editorial Committee (2009); Haskins & Hayden (1987); Morgan & Soltis (1993); Thiede In Kubitzki, Bayer, & Stevens (2007). Show full citations.

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image of plant© Scott Ward | Penthorum | Original Image ⭷
image of plant© Scott Ward | Penthorum | Original Image ⭷

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