Cryptantha is a genus of roughly 104–110 species of flowering plants in the borage family (Boraginaceae), placed in the subfamily Boraginoideae. Plants are annual or perennial herbs, typically coated in rough, bristly hairs that give a sandpapery texture to the stems and leaves. The flowers are small with rounded corollas, almost always white, though a handful of species produce yellow flowers. The genus is commonly called cat's eyes or popcorn flowers — names shared with closely related genera such as Plagiobothrys.
The genus ranges across western North America and western South America, with a conspicuous gap in Central America and the tropics in between. Its North American range extends from Alaska and western Canada south through the western United States; in South America it reaches from Peru and Bolivia south to Argentina and Chile, with an introduced presence in New York State.
Cryptantha was formally published by Lehmann, attributed to G. Don, in General History 4: 373 (1837). Two heterotypic synonyms are recognized: Krynitzkia Fisch. & C.A.Mey. (1841) and Hemisphaerocarya Brand (1927). The type species is Cryptantha glomerata. The genus has undergone significant taxonomic revision: numerous species have been transferred to segregate genera including Oreocarya, Johnstonella, and Greeneocharis. Species identification within the genus depends heavily on nutlet characters — the shape, size, surface texture, color, and pattern of attachment of the small hard fruits vary considerably among species.
Etymology
The genus name Cryptantha derives from the Greek kryptos ("hidden") and anthos ("flower"), meaning "hidden flower." The name likely refers to the inconspicuous, often concealed nature of the small flowers, which are partly enclosed by surrounding bracts and calyx lobes. It was published in 1837.
Distribution
Cryptantha has a strongly disjunct distribution, occurring in western North America and western South America, with the genus absent from Central America and the intervening tropical regions. In North America, species range from Alaska and western Canada south through the western United States into Mexico. In South America, the genus is native to Peru, Bolivia, Argentina, and Chile. POWO also records an introduced presence in New York State.
Taxonomy
Cryptantha was formally described by Lehmann and published under the authority of G. Don in General History 4: 373 (1837). The authorship is sometimes listed as "Lehm. ex Fisch. & C.A.Mey." in some GBIF treatments, reflecting differences in how the original description is attributed across databases. The genus belongs to family Boraginaceae, subfamily Boraginoideae, order Boraginales.
Two heterotypic synonyms are recognized by POWO: Krynitzkia Fisch. & C.A.Mey. (1841) and Hemisphaerocarya Brand (1927). The type species is Cryptantha glomerata. Species counts vary by source — POWO lists 104 accepted species, while Wikipedia cites approximately 110 as of early 2024, reflecting ongoing taxonomic work.
The genus has undergone considerable reorganization: numerous former Cryptantha species have been transferred to segregate genera including Oreocarya, Johnstonella, and Greeneocharis. Within the genus, species delimitation relies heavily on nutlet morphology — the shape, size, surface ornamentation, color, and attachment pattern of the nutlets are the primary diagnostic characters.
