Pachycereeae
Pachycereus pringlei
The Pachycereeae are a tribe in the subfamily Cactoideae from the cactus family ( Cactaceae ).
Description
The large, tree -like or shrubby species growing the Pachycereeae not form segmented columnar and ribbed trunks.
The flowers forming portions are not differentiated. The flowers appear laterally, often below the shoot tip or from the cephalium and open at night and rarely a day. The small to medium sized radial symmetry or zygomorphic, varying in the shape of flowers are hermaphrodite. The flower cups is scaled or rarely occupied bald and with thorny or bristly areoles.
The aufreißenden or not aufreißenden fruits are fleshy. They contain medium to large seeds. Hilum and micropyle of the seed are connected or united, missing appendages.
Systematics and distribution
The Tribe Pachycereeae is mainly in Mexico and the southwestern United States, but also in the Caribbean, Central America and South America ( to Venezuela) spread.
Today's classification as a tribe of Cactaceae was made in 1958 by Franz Buxbaum. He distinguished the four subtribe Myrtillocactinae, Pachycereinae, Pterocereinae and Stenocereinae. Arthur C. Gibson and Kevin C. Spencer introduced in 1978 after their investigations, the subtribe Myrtillocactinae and Pterocereinae in the subtribe Stenocereinae.
After Edward Frederick Anderson ( 2005) the following genera belong to the tribe:
- Acanthocereus ( Engelm. ex A.Berger ) Britton & Rose
- Bergerocactus Britton & Rose Bergerocactus emoryi
- Carnegiea gigantea
- Escontria chiotilla
- Isolatocereus dumortieri