Pereskia
Sign in to savePereskia is a small genus of about four species of cacti that do not look much like other types of cacti, having substantial leaves and non-succulent stems. The genus is named after Nicolas-Claude Fabri de Peiresc, a 16th-century French botanist. The genus was more widely circumscribed until molecular phylogenetic studies showed that it was paraphyletic. The majority of species have since been transferred to Leuenbergeria and Rhodocactus. Although Pereskia does not resemble other cacti in its overall morphology, close examination shows spines developing from areoles, and the distinctive floral
Species
GENUS
- KingdomPlantae
- PhylumTracheophyta
- ClassMagnoliopsida
- OrderCaryophyllales
- FamilyCactaceae
Native toArgentina Northeast, Argentina Northwest, Bolivia, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Colombia, French Guiana, Guyana, Panamá, Paraguay
Pereskia est un genre de cactus. Ce genre est composé d'une dizaine d'espèces arbustives ou buissonnantes, croissant dans les zones tropicales d'Amérique. La floraison se produit durant la saison humide. Ce genre a la particularité rare chez les cactacées de porter des feuilles apparentes. Ce genre a été nommé par le Père Charles Plumier, religieux de l'ordre des Minimes, en hommage à l’astronome français Nicolas-Claude Fabri de Peiresc, lors de la première description de Pereskia aculeata en 1703 dans son ouvrage "Nova Plantarum Americanarum Genera", page 35 . Les règles internationales de la taxonomie fixant comme point de départ de la reconnaissance des descriptions botaniques l’invention de la taxonomie binomiale par Linné le nom de Plumier ne figure pas comme auteur initial. De ce fait, l'auteur officiel du genre en est Philip Miller qui en fera une description de reprise dans la 4e édition de "The Gardeners Dictionary" en 1754. Les noms de 11 espèces sont acceptés officiellement selon "The Plant List", fruit du travail de rationalisation effectué conjointement par les Jardins botaniques royaux de Kew et le Jardin botanique du Missouri.
via GBIF · Kew POWO
Article
10 sectionsContents
- Description
- Taxonomy
- Phylogeny and evolution
- Species
- Synonyms
- Distribution
- Uses
- References
- Bibliography
- External links
Pereskia is a small genus of about four species of cacti that do not look much like other types of cacti, having substantial leaves and non-succulent stems. The genus is named after Nicolas-Claude Fabri de Peiresc, a 16th-century French botanist. The genus was more widely circumscribed until molecular phylogenetic studies showed that it was paraphyletic. The majority of species have since been transferred to Leuenbergeria and Rhodocactus. Although Pereskia does not resemble other cacti in its overall morphology, close examination shows spines developing from areoles, and the distinctive floral cup of the cactus family.
==Description== The four species of Pereskia as the genus is now circumscribed share many features in common with Leuenbergeria and Rhodocactus, which were formerly included in a broadly defined Pereskia. They are shrubs, trees or climbing vines, with maximum heights varying between 3 and 10 m. Unlike the great majority of species of cacti, they have persistent leaves. Like all cacti, they have spines borne on areoles. Their succulent leaves are longer than wide, reaching 11 cm by 5 cm in the case of P. aculeata. Their flowers are borne in small clusters or are solitary, except for P. aculeata which can have inflorescences of 70 or more individual flowers. P. aculeata has edible fruits, 1.5–2.5 cm in diameter; the other species have smaller fruits, only up to 6 mm in diameter in the case of P. horrida. Unlike Leuenbergeria, the stems of Pereskia delay forming bark and have stomata. Unlike Rhodocactus, there are no leaves on the areoles. thumb|Habit of Pereskia aculeata thumb|Areoles and spines of Pereskia aculeata