Jamesia

Jamesia americana

Jamesia is a plant genus of the family of hydrangea plants ( Hydrangeaceae ). It comprises two native species in southern North America.

Description

Jamesia are deciduous shrubs. The leaves are stalked, and serrated on the edge.

The inflorescences are panicles zymöse, the cymes are like Asia, barren flowers are missing.

The four to five sepals are superimposed klappig. The four to five imbricate or klappig arranged petals are spatulate and white to pink.

The stamens of 8 to 10 stamens are commended shaped, the connective of the anther protrudes at their ends. The pens are short with long branches stylus pen or the branches are straight up. The medium-sized ovary is three to fünffächrig. The fruit is a capsule that scheidewandspaltig opens to maturity to release the approximately twenty ( per subject but less than six ) 0.5 to 1 mm long, winged seeds.

The chromosome number is n = 16

Dissemination

The distribution of the genus ranges from the Great American Basin to the north and south of Mexico, particularly common they are in the southern Rocky Mountains. Jamesia are found exclusively in mountain ranges.

System

The genus was first described in 1840 by John Torrey and Samuel Frederick Gray, the type species is Jamesia americana. Within the family, it is placed in the subfamily Jamesioideae whose type genus it is. It includes only two types:

• Jamesia americana Torr. & A. Gray
• Jamesia tetrapetala N.H.Holmgren & P.K.Holmgren.

Evidence

• L. Hufford: Hydrangeaceae. In: Klaus Kubitzki (ed.): The Families and Genera of Vascular Plants - Volume VI - Flowering Plants - Dicotyledons - Celastrales, Oxalidales, Rosales, Cornales, Ericales, 2004, pp. 209-210, ISBN 978-3-540 - 06512-8

• Hydrangea plants
• Hydrangeaceae