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Weeping Crack-willow - Salix pendulina
Family - Salicaceae
Also known as - Wisconsin weeping willow

A hybrid of S. babylonica and S. fragilis the Weeping Crack Willow is a deciduous tree introduced to the UK in 1867.  A member of a family of around 400 trees and shrubs, it grows to a height of about 10M (33ft) preferring damp places.  It can be a popular ornamental tree often grown by water and in damp places, parks and gardens with long thin trailing branches of yellow twigs and lanceolate leaves, bright green on top, green-blue below.  Male ♂ catkins (flowers) are found on differing trees to the female ♀ when the leaves appear in April to May, the catkins grow to 8cm (3.2in).  Willow bark has been used for tanning and is also rich in the alkaloid Salicine, which has tonic and astringent properties, often used instead of Quinine, although not as powerful.  Willow has an historical association with sadness.  

Willows can suffer from quite spectacular rust infections caused by several species of Tree Rust - Melampsora spp. where dusty orange spots or pustules appear on the undersides of the leaves.  Severe attacks can leave the leaf virtually covered in pustules, and can be ocassionally intermingled with black ones.  Rust fungi are biotrophs and as they cannot survive on dead plant material, they must either alternate with a different perennial host including Euonymus (Spindle Tree), Larix (Larch), Ribes (Gooseberry), Saxifraga, or produce resting spores.  Tree rusts can also affect Poplar, Willow, Birch and Plum species.

Weeping Crack-willow - Salix pendulina, click for a larger image Weeping Crack-willow - Salix pendulina, click for a larger image Weeping Crack-willow - Salix pendulina, click for a larger image Willow Rust - Melampsora spp., click for a larger image
Willow Rust
Melampsora spp.
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