5120 x 3427 px | 43,3 x 29 cm | 17,1 x 11,4 inches | 300dpi
Date de la prise de vue:
2009
Lieu:
Botanical Garden, California, USA
Informations supplémentaires:
The genus Mammillaria is one of the largest in the cactus family (Cactaceae), with currently 171 known species and varieties recognized. Most of the mammillarias are native to Mexico. Mammillarias have extremely variable spination from species to species, and attractive flowers. The distinctive feature of the genus is the specific development of an areole, that is split into two clearly separated parts, one occurring at the tubercle's apex, the other at its base. The apex part is spine bearing, and the base part is always spineless, but usually bearing some bristles or wool. The base part of the areole bears the flowers and fruits, and is a branching point. The name cactus derived from the Greek word kaktos, which means prickly plant. Cacti come in unusual shapes, sizes, textures and flower colours. Most have abandoned leaves and unusual body shapes to prevent loss of water. Some are ribbed or segmented and they may be covered with decorative spines, bristles or hairs. Cacti are distinctive and unusual plants, which are adapted to extremely arid and hot environments, showing a wide range of anatomical and physiological features which conserve water. Their stems have expanded into green succulent structures containing the chlorophyll necessary for life and growth, while the leaves have become the spines for which cacti are known.
