Oreocarya, commonly called perennial cat's-eye, is a genus of roughly 63 species of perennial and biennial flowering plants in the family Boraginaceae (order Boraginales). The genus is native to western North America, ranging from Alberta, British Columbia, and Saskatchewan in Canada southward through the western United States — most abundantly across the Colorado Plateau and Great Basin — into northern Mexico.
Plants are characterised by a stout taproot and a simple or branching caudex that bears a basal rosette of leaves. From the rosette rises one or more herbaceous flowering stems clothed in linear, spatulate, or oblanceolate leaves with entire margins and long-tapered bases. The inflorescence is an open, leafy bracteate thyrsus or a helicoid cyme. Flowers are notably larger than those of the closely related genus Cryptantha — more than 5 mm across, often distinctly long-tubular, and bearing a conspicuous yellow fornix (eye) at the throat.
Oreocarya was first described by Edward Lee Greene in 1887, when he segregated it from Eritrichium. The genus was subsequently absorbed into Cryptantha by Ivan M. Johnston (1924) and E. B. Payson (1927). This broad circumscription stood for nearly a century until phylogenetic analysis based on DNA sequencing, published in 2012 by Weber and Wittmann, demonstrated that the perennial species form a lineage distinct from annual Cryptantha. All perennial Cryptantha were accordingly returned to Oreocarya, a reclassification endorsed by the Biota of North America Program (BONAP) in 2015.
Most species favour open, xerophytic habitats at middle elevations — arid shrublands, rocky slopes, and sandy deserts. A few extend to alpine terrain, and several can tolerate heavy clay soils, but no species is found in waterlogged or moist, undrained ground.
Etymology
The name Oreocarya is derived from the Greek words oreos (mountain) and caryum (nut), reflecting the rocky, montane habitats where many species occur. The genus was first formally published by botanist Edward Lee Greene in Pittonia volume 1, page 57, in 1887.
Distribution
Oreocarya is native to western and central Canada (Alberta, British Columbia, Saskatchewan), the western United States (including Alaska, Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming, among others), and northern Mexico. The greatest diversity of species is concentrated in the Colorado Plateau and Great Basin regions of the United States.
Ecology
Most Oreocarya species inhabit open, xerophytic environments at middle elevations, including arid shrublands, stony slopes, and sandy desert margins. Some species extend into alpine habitats (notably O. weberi, O. crymophile, and O. thompsonii), while others (O. virginensis, O. rugulosa, O. semiglabra) can grow in heavy clay soils. No species tolerates moist, poorly drained ground. Only a small number of species can persist in the partial shade cast by overhanging trees or shrubs.
Taxonomy Notes
Oreocarya was established by Edward Lee Greene in 1887 from species previously placed in Eritrichium. After a series of expansions by Greene, Eastwood, and Rydberg through 1916, Macbride revised the genus in the same year. Ivan M. Johnston (1924) and E. B. Payson (1927) subsequently merged Oreocarya entirely into Cryptantha. The genus remained in synonymy for nearly 90 years until 2012, when phylogenetic analyses confirmed that perennial members of Cryptantha constitute a distinct clade; Weber and Wittmann resurrected Oreocarya, and BONAP formally adopted the reclassification in 2015. Oreocarya is placed within subtribe Amsinckiinae of Boraginaceae.
