Krascheninnikovia is a small genus of flowering plants in the subfamily Chenopodioideae of the family Amaranthaceae (order Caryophyllales), commonly known as winterfat — a name that reflects its value as a nutritious winter forage for livestock. The genus is distributed primarily across Eurasia, with two species also occurring in western North America.
Plants in the genus are erect subshrubs or shrubs, densely covered with distinctive dendroid (branching, tree-like) stellate hairs as well as simple unbranched hairs, giving them a woolly or felty appearance. The alternate leaves range from linear to narrowly lanceolate to ovate, with entire margins, and can be petiolate or nearly sessile. Flowers are unisexual; the plants may be monoecious or dioecious. Male flowers form interrupted spike or subcapitate inflorescences, each consisting of four basally fused perianth segments and four stamens. Female flowers are borne singly or in pairs in leaf axils, enclosed by two hairy bracteoles fused at the base and tipped with four hornlike projections; a perianth is absent. The hairy fruit is ovate and compressed, with the membranous pericarp free from the seed. The base chromosome number is x=9.
The genus contains two well-known species: Krascheninnikovia ceratoides (Eurasian winterfat), the only species native to Europe, and Krascheninnikovia lanata (common winterfat), widespread across arid regions of western North America. Both thrive on well-drained, calcareous soils with low to moderate salinity, and are notably drought-tolerant and intolerant of waterlogging or acidic conditions.
Etymology
The genus name Krascheninnikovia commemorates Stepan Petrovich Krasheninnikov (1711–1755), a Russian botanist and explorer best known for his scientific survey of Kamchatka.
Distribution
Krascheninnikovia species are distributed primarily across Eurasia; in Europe, only K. ceratoides occurs, native to eastern and southern regions. Two species are also found in western North America, where winterfat grows on dry valley bottoms, flat mesas, and hillsides at elevations between approximately 730 and 2,830 metres (2,400–9,300 ft) on well-drained, calcareous soils with low to moderate salt concentrations.
Ecology
Winterfat is drought-resistant and intolerant of flooding, excess water, or acidic soils. In desert regions, seed production is closely tied to precipitation: good seed years occur when there is appreciable summer rainfall and limited browsing pressure from herbivores.
