''Prenanthes'' is a genus of plant in the family

Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae ...

, often referred to as rattlesnake root. Molecular analysis in 2009 revealed that the genus as traditionally envisioned is

polyphyletic A polyphyletic group is an assemblage of organisms or other evolving elements that is of mixed evolutionary origin. The term is often applied to groups that share similar features known as homoplasies, which are explained as a result of conver ...

, meaning that it is a conglomeration of species not closely related to one another. All but one species will be moved to other genera, leaving only ''Prenanthes purpurea''. The species, sometimes called purple lettuce, is widespread across much of

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a subcontinent of Eurasia and it is located enti ...

and the

Middle East The Middle East ( ar, الشرق الأوسط, ISO 233: ) is a geopolitical region commonly encompassing Arabia (including the Arabian Peninsula and Bahrain), Asia Minor (Asian part of Turkey except Hatay Province), East Thrace (Europ ...

.Altervista Flora Italiana, Lattuga montana purpurea, Purple Lettuce, ''Prenanthes purpurea'' L.
includes photos, drawings, and distribution maps The genus formerly included; ''

Aetheorhiza ''Aetheorhiza'' is a genus of flowering plants in the daisy family described as a genus in 1827. There is only one known species, ''Aetheorhiza bulbosa'', the tuberous hawk's-beard, native to Europe and the Mediterranean The Mediterranean S ...

Askellia ''Askellia'' is a genus of Asian and North American plants in the tribe Cichorieae within the family Asteraceae. ; Species Brickellia ''Brickellia'' is a North American genus of about 100 to 110 species of plants in the family Asteraceae, known commonly as brickellbushes. They are found in Canada, the United States, Mexico, and Central America. Many species are native to the ...

, Chondrilla,

Crepidiastrum ''Crepidiastrum'' is an Asian genus of flowering plants in the family Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Co ...

Crepis ''Crepis'', commonly known in some parts of the world as hawksbeard or hawk's-beard (but not to be confused with the related genus ''Hieracium'' with a similar common name), is a genus of annual and perennial flowering plants of the family Aster ...

Emilia Emilia may refer to: People * Emilia (given name), list of people with this name Places * Emilia (region), a historical region of Italy. Reggio, Emilia * Emilia-Romagna, an administrative region in Italy, including the historical regions of Emi ...

Erythroseris ''Erythroseris'' is a genus of African plants in the tribe Cichorieae within the family Asteraceae. ; Species * '' Erythroseris amabilis'' (Balf.f.) N.Kilian & Gemeinholzer - Socotra (part of Yemen) * '' Erythroseris somalensis'' (R.E.Fr.) N.Ki ...

, Faberia,

Hololeion ''Hololeion'' is a genus of East Asian flowering plants in the family Asteraceae. It is native to Japan, Korea, China, and the Russian Far East. ; Species * '' Hololeion fauriei'' (H.Lév. & Vaniot) Kitam. - South Korea * '' Hololeion krameri'' ...

Hypochaeris ''Hypochaeris'' is a genus of plants in the family Asteraceae. Many species are known as cat's ear. These are annual and perennial herbs generally bearing flower heads with yellow ray florets. These plants may resemble or be confused with dandel ...

Ixeris ''Ixeris'' is a genus of Asian flowering plants in the family Asteraceae. Concepts of which species should be included in the genus have changed in recent years because of the use of molecular investigations. Numerous species formerly regarded a ...

Kovalevskiella ''Kovalevskiella '' is a genus of Asian plants in the dandelion tribe within the sunflower family. ; Species * '' Kovalevskiella aitchisoniana'' (Beauverd) Kamelin - Afghanistan * '' Kovalevskiella kovalevskiana'' (Kirp.) Kamelin - Kazakhsta ...

Lactuca ''Lactuca'', commonly known as lettuce, is a genus of flowering plants in the family Asteraceae. The genus includes at least 50 species, distributed worldwide, but mainly in temperate Eurasia. Its best-known representative is the garden lettuce ...

Lapsanastrum ''Lapsanastrum'' is a genus of flowering plants in the family Asteraceae, native to East Asia ( China, Korea Korea ( ko, 한국, or , ) is a peninsular region in East Asia. Since 1945, it has been divided at or near the 38th parallel, ...

Launaea ''Launaea'' is a genus of flowering plants in the family Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly refe ...

Lygodesmia ''Lygodesmia'', called skeletonplant, is a genus of North American flowering plants in the tribe Cichorieae within the family Asteraceae.

Nabalus ''Nabalus'' is a genus of Asian and North American flowering plants in the tribe Cichorieae within the family Asteraceae. ''Nabalus'' is now considered the correct name for a group of plants in North America that were formerly considered to be m ...

Notoseris ''Notoseris'' is a genus of Asian flowering plants in the tribe Cichorieae within the family Asteraceae. The plants are native to Asia Asia (, ) is one of the world's most notable geographical regions, which is either considered a conti ...

Paraprenanthes ''Paraprenanthes'' is a genus of East Asian plants in the tribe Cichorieae within the family Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within ...

Parasenecio ''Parasenecio'' is a genus of flowering plants in the groundsel tribe within the sunflower family. Most of the species are Asian, but one ''(P. auriculatus)'' occurs in the Aleutian Islands in Alaska Alaska ( ; russian: Аляска, A ...

Picrosia ''Picrosia'' is a genus of South American plants in the tribe Cichorieae within the family Asteraceae. ; Species * '' Picrosia cabreriana'' A.G.Schulz - Brazil ( Paraná, Rio Grande do Sul, Santa Catarina), Paraguay (Amambay), Argentina ( Cha ...

Sonchella ''Sonchella'' is a genus of Asian flowering plants in the family Asteraceae. ; Species * '' Sonchella dentata'' (Ledeb.) Sennikov - Russia ( Altai, Tuva), China (Qinghai), Mongolia * '' Sonchella stenoma'' (Turcz. ex DC.) Sennikov - Russia (Burya ...

Sonchus ''Sonchus'' is a genus of flowering plants in the tribe Cichorieae within the family Asteraceae and are commonly known as sow thistles (less commonly hare thistles or hare lettuces). Sowthistles are annual, biennial or perennial herbs, with or ...

, Soroseris,

Stephanomeria ''Stephanomeria'' is a genus of North American plants also known as wirelettuce, belonging to the tribe Cichorieae within the family Asteraceae.Lee, J., Baldwin, B., and Gottlieb, L.D.; ''Phylogeny of ''Stephanomeria'' and related genera (composi ...

Trixis ''Trixis'' is a genus of shrubs in the family Asteraceae, native to North and South America including the West Indies. Members of the genus are commonly known as threefolds due to the outer lip of the corolla. The generic name is derived from ( ...

, and Youngia''

References

Cichorieae Monotypic Asteraceae genera {{Cichorieae-stub