Exochorda

Exochorda racemosa

The Exochorda are a genus of flowering plants of the rose family ( Rosaceae ).

Description

Exochorda are unbestachelte, deciduous shrubs. Its leaves are alternate, are simple, entire or toothed at the margin, stipules are present.

The inflorescence is a terminal raceme, the large flowers are five-, rarely cruciform. The flower cup is bell - up reversed cone- shaped, an outer cup is missing. The sepals are above each other like roof tiles, the petals are white.

The fifteen to thirty stamens are in groups of three to five before the petals and are separated by large gaps. The Diskus is clearly trained in a ring. The five carpels are straight up with the flower cups, but together laterally. The scars are broadened. There are two parallel to each other, hanging from the top of ovules.

The fruit is a Sammelbalgfrucht of five Einzelbälgen with a woody pericarp and one or two seeds per bellows. The chromosome number is 2n = 16

Dissemination

Exochorda found in Asia from Siberia to China and Korea to Japan.

System

The genus was first described in 1858 by John Lindley. It is classified in the tribe Osmaronieae, Supertribus Kerriodae the subfamily Spiraeoideae. There are four types:

• Exochorda giraldii
• Exochorda korolkowii
• Exochorda racemosa
• Exochorda serratifolia

Evidence

• C. Kalkman: Rosaceae. In: Klaus Kubitzki (ed.): The Families and Genera of Vascular Plants - Volume VI - Flowering Plants - Dicotyledons - Celastrales, Oxalidales, Rosales, Cornales, Ericales. Springer -Verlag, Berlin 2004, pp. 354-355, ISBN 978-3-540-06512-8