Daylilies: The Wild Species and Garden Clones, Both Old and New, of the Genus Hemerocallis
Lithops - Treasures of the Veld: Observations on the genus Lithops N.E.Br.
Crocuses: A Complete Guide to the Genus
Clematis, The Genus: A Comprehensive Guide for Gardeners, Horticulturists and Botanists
The Genus Cyclamen (Kew magazine monographs) by Christopher Grey-Wilson (1988-11-05)
The Genus Galanthus: A "Botanical Magazine" Monograph
