The rose-like plants (Rosidae) form a subclass of the flowering plants (Magnoliophyta) in some systematics . They essentially correspond to the Rosids . The individual groups have produced a great variety of flower and growth forms and many are important as useful plants.
The flowers are predominantly radial symmetry , less often dorsiventral. They have a cyclical structure, five or four numbers. They have a double flower envelope : the calyx corresponds to the perigone of the Magnoliopsida and the simple Rosopsida . The petals have developed from an outer circle of stamens . The petals are mostly free, ie not grown together, so they were previously placed in a development stage "Dialypetalae". The androeceum usually consists of two circles (diplostemony). However, secondary, centripetal or centrifugal polyandry has occurred in some kin groups . In wind-flowered groups, the petals and stamens can also be reduced again (secondary apetaly and haplostemony).
In the basal systems are the fruit leaves still available ( choricarpy ), but it outweigh overgrown carpels (coenocarpy). The ovules have two integuments and are crassinucellate. The secondary endosperm usually develops in a nuclear way.
The plastids of the sieve tubes are predominantly of the S type. Phytochemically, the Rosidae are characterized by the occurrence of trihydroxylated flavonoids (such as myricetin and leucodelphinidin), ellagic acid and ellagic and gallo tannins . Benzylisoquinoline alkaloids , betalaine , iridoids and indole alkaloids are largely or completely absent .
The orders are of great economic importance: Rosales , with numerous types of fruit such as apple , pear , cherry and wine ; furthermore the fabales with the legumes beans , peas , lentils , further soybeans and peanuts ; the sapindales include the citrus fruits ; to the Malpighiales the common flax or flax, the rubber tree and the cassava plant . Many timber from the temperate latitudes belong to the Fagales .
- Subclass rose-like (Rosidae)
- basal groups
- No inclusion in any order
- Eurosiden I
- no integration into an order
- Eurosiden II
- basal groups
- P. Sitte, H. Ziegler, F. Ehrendorfer, A. Bresinsky: Textbook of botany for universities. 34th edition. Founded by E. Strasburger ... Gustav Fischer, Stuttgart 1998.