Whorl (botany)

As a whorl arrangement of leaves is referred to in botany, start with two or more leaves at a node. When three or more blades is also spoken by whorl. The side branches, which arise from the leaf axils, are also whorled. Wear these branches flowers, they are called Blütenquirl. From lively standing branches ( " Astquirl " ) the kitchen appliances of the same name were made earlier.

If several sheets at a node, it is called by many luxurious ( polymeric ) whorls. One example is the mare's tail ( Hippuris vulgaris). Most are a few pages at a node, the loosestrife ( Lysimachia vulgaris) there are three. In twofold ( dimeric ) whorls is usually spoken of against permanent Beblätterung.

For the arrangement of the leaves in whorls two rules of Wirtelstellung apply:

In the older literature as well as in French and English of the whorl with three or more members is defined. Wilhelm Troll 1937 against constant leaf position integrated into the whorl definition.

Flowers

In most species the petals in whorls are arranged, they are then referred to as cyclic flowers. They are also sometimes referred to as circles. The whorl is usually 2 -, 3 -, 4 - or 5- trifoliate. Most hermaphrodite flowers consist of four ( tetracyclic with two Blütenhüllblätterwirteln, a Staubblattwirtel and a Fruchtblattwirtel ) or five whorls ( penta cyclic, with two Blütenhüllblattwirteln, two Staubblattwirteln and a Fruchtblattwirtel ).