Cryptantha, Botany–West (U.S.)
This study is a taxonomic revision of Cryptantha subgenus Oreocarya (Boraginaceae), together with descriptions of species, synonyms, distribution maps, and discussions. The present treatment recognizes fifty-seven species and fourteen varieties, all separated by means of a comprehensive key, A history of the group, along with a discussion of distribution, ecology, and phylogeny is presented. As a basis for the comparison of taxa much of the research has been concentrated on morphological variation in herbarium specimens. Particular attention has been directed to a study of pubescence types, branching patterns, flowers, calyces, and fruit. The herbarium research has been correlated with extensive field observations and collections made throughout most of western North America.
Higgins, Larry C.
"A revision of Cryptantha subgenus Oreocarya,"
Brigham Young University Science Bulletin, Biological Series: Vol. 13
, Article 1.
Available at: http://scholarsarchive.byu.edu/byuscib/vol13/iss4/1