Lee Kong Chian Natural History Museum

Rosales

Photo credit: Wang Luan Keng
Kingdom:Plantae
Phylum/Division:Magnoliophyta
Class:Eudicots
Order:Rosales

Description

An order of flowering herbs, shrubs and trees, with about 7,700 species from nine families. The most primitive of the Rosales are the rose family (Rosaceae). Other families include the hemp family (Cannabaceae), fig family (Moraceae), buckthorn family (Rhamnaceae), elm family (Ulmaceae) and nettle family (Urticaceae).

All Rosales have alternate leaves with stipules. Flowers usually have five sepals  (fused at their base) and petals, with many stamens and an inferior ovary. Thorns or hairs are often present on the plant..

Some genera of Rosales have developed symbiotic relationships with nitrogen-fixing bacteria (Frankia spp.) that live in root nodules.

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