Rhododendron orbiculare - Round-leaved rhododendron

Rhododendron orbiculare, also known as a round-leaved rhododendron, is an evergreen shrub from the family of Ericaceae. This species is a botanical peculiarity primarily because of its unusually rounded leaves and its striking, bell -shaped flowers and is often cultivated in botanical gardens and collections.

Morphology

Rhododendron orbiculare grows as a wide -out shrub and reaches growth heights of 1 to 3 meters. The plant is characterized by its round to wide elliptical leaves, which can reach a length of 5 to 10 cm and a width of 4 to 8 cm. The top of the leaf is smooth and dark green, while the underside is shaped by a slightly gray -green color.

The flowers are bell -shaped, about 2 to 3 cm long and arranged in dense, terminal umbels. Their color varies from light pink to deep pink, rarely also into whitish. The flowering period is between April and May. After the pollination, cylindrical capsule fruits form, which contain numerous fine seeds.

Distribution and habitat

Rhododendron orbiculare is endemic in China, especially in the provinces of Sichuan and Yunnan. There the plant grows in subalpins and assembly forests as well as on damp mountain slopes at altitudes of 1,800 to 3,500 meters. She prefers cool, moist climate conditions and thrives on acidic, humus -rich soils.

The locations on which Rhododendron orbiculare occurs, are often shaped by high rainfall and foggy conditions, which has adapted the plant to shady to partially shaded layers with good humidity.

Ecological meaning

This species is an important part of its natural habitat, since it grows in dense forests as a undergrowth plant and thus offers living space and protection for numerous smaller organisms. The flowers attract pollers such as bumblebees and other insects that ensure the reproduction and genetic variety of the plant.

Use and culture

Rhododendron orbiculare is often used as an ornamental plant in gardens and parks, especially in regions with moderate climate. Her unusually shaped leaves and the spectacular bloom make them a coveted type of collector in botanical gardens. Because of its origin from mountain regions, the plant is Frosthart and tolerates temperatures up to -15 ° C, as long as the soil is well permeable and waterlogging is avoided.

However, the plant requires acidic ground conditions (pH 4.5–6) and is sensitive to lime. Regular mulching with bark compost or peat can help optimize the soil conditions.

Hanging and protection

In their natural homeland applies Rhododendron orbiculare not endangered, but certain populations are threatened by habitat loss and the spread of agricultural areas. International botanical collections and maintenance programs help to secure the genetic variety of this kind and to ensure its long -term survival.