Kalopanax septemlobus

Kalopanax septemlobus, common name Kalopanax or Prickly Castor-oil Tree, is a deciduous tree in the family Araliaceae, the sole species in the genus Kalopanax. It is native to northeastern Asia, from Sakhalin and Japan west to southwestern China.

It grows to 30 m tall, with a trunk up to 1-1.5 m diameter. The stems are often spiny, with stout spines up to 1 cm long. The leaves are alternate, in appearance similar to a large Fatsia or sweetgum leaf, 15-35 cm across, palmately lobed with five or seven lobes, each lobe with a finely toothed margin.

The leaf lobes vary greatly in shape, from shallow lobes to cut nearly to the leaf base.

The flowers are produced in late summer in large umbels 20-50 cm across at the apex of a stem, each flower with 4-5 small white petals. The fruit is a small black drupe containing 2 seeds.


Cultivation
It is cultivated as an ornamental tree for the 'tropical' appearance of its large palmate leaves in Europe and North America; despite its tropical looks, it is very hardy, tolerating temperatures down to at least -40°C. The plant grows very quickly at first, however slowing in growth rate when reaching around 40 years old.

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