A Revision of the Lennoaceae

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Abstract
The Lennoaceae are a small family of New World holorhizoparasites distantly related to the Boraginaceae and Verbenaceae. The three genera and total of seven species that have traditionally been accepted for the family are here reduced to two genera and four species. Lennoa is a genus of annual plants with 8-merous flowers, biseriate nodding stamens with basally spreading thecae, 7-12 vascular bundles per stem, pollen exine with a granular infrastructural layer, and diploid with n = 9. Lennoa is monotypic, with two formae of L. madreporoides recognized. Pholisma is a genus of perennial plants with 4-10-merous flowers, uniseriate erect stamens with parallel thecae, 15-25 vascular bundles per stem, tectate-columellate exine infrastructure, and tetraploid with n = 18. Pholisma (including Ammobroma) contains three very well-marked species: P. arenarium, P. culiacanum, and P. sonorae.