Osmorhiza berteroi is a species of flowering plant in the carrot family known by the common name mountain sweet cicely.
O. berteroi forms a species complex together with O. depauperata and O. purpurea. Until recently these were all treated as O. chilensis, but a revision resulted in the 3 species being split, and also revealed that O.chilensis, published in December 1830 by Hooker and Arnott was a junior synonym of O.berteroi, published in September of the same year by De Candolle.<ref name="swCOplants">Template:Cite web</ref>
It has an amphitropical distribution being native to both temperate parts of North and South America. In the Northern Hemisphere it is found boreal zones from Alaska to Newfoundland, extending south to South Dakota, and in mountain ranges adjacent to the Pacific coast from the Alaska panhandle to California and Arizona.<ref name="Klinkenberg2014" /> In South America it occurs in Magellanic forests in Argentina and Chile.<ref name="Moore1983">Template:Cite book</ref><ref name="Reiche19xx">Template:Cite book</ref><ref name="FdeC">Template:Cite web</ref>
The amphitropical distribution is believed to have arisen recently (in the past 1 million years), probably by seeds attached to the feathers of migratory birds.<ref name=wen2009evolution>Template:Cite journal</ref> In contrast the east-west disjunct distribution are most likely relict populations of a once continuous range.Template:Citation needed
It grows in wooded and forested areas.<ref name="Klinkenberg2014">Template:Cite web</ref><ref name="Sullivan2015">Template:Cite web</ref> In the Great Lakes area O. berteroi is found in hardwood forests dominated by Sugar Maple<ref name="MNrarePlants">Template:Cite web</ref>
O. berteroi is a short-lived perennial. It usually flowers in late Spring (June in Minnesota,<ref name="MNrarePlants" /> October to December in Chile<ref name=Reiche19xx />). It is insect-pollinated, with seed being distributed by animals, typically by attaching to the fur of mammals (epizoochory).<ref name="MNrarePlants" />
It is an aromatic perennial herb producing a branching stem which may exceed a meter tall. The plentiful green leaves have blades up to 20 centimeters long which are divided into three leaflets (trifoliate), which are toothed or lobed. The blade is borne on a long petiole. The inflorescence is a compound umbel of many tiny white flowers at the tip of a stemlike peduncle. There are 4–10 florets on each umbellule with the central florets only possessing anthers.<ref name="Reiche19xx" /> The narrow, elongated fruit is ribbed and bristly, measuring up to 2.5 centimeters long.<ref name="WTU Herbarium2015">Template:Cite web</ref><ref name="PLANTS">Template:Cite web</ref>
O. berteroi occurs alongside several other species of Osmorhiza throughout its range, but is most likely to be confused with O. depaurerata. The two species are very similar and most easily separated by examining the seeds<ref name="Reiche19xx" /><ref name="MNrarePlants" />
Relationship with humans
Use for food and medicine
O. berteroi was used as a source of food by several groups of Native Americans in all parts of its native range. These included the Selknam people in what is now ChileTemplate:Citation needed, and tribes of the Great Plains, such as the Cheyenne and Blackfoot.<ref name="Ethno12">Template:Cite journal</ref><ref name="Hungrywolf2006">Template:Cite book</ref> The root was eaten, and also used as a medicinal treatment for coughs and colds.<ref name="Hungrywolf2006" /><ref name="Johnson1998">Template:Cite book</ref>
It is not threatened in most parts of its range. However some disjunct populations in eastern North America are isolated, and the typical habitat is fragmented and prone to destruction.<ref name="MNrarePlants" />
- Jepson Manual Treatment
- USDA Plants Profile
- Photo gallery
- Osmorhiza berteroi at the North American Plant Atlas. County distribution in Continental USA.