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Ceratozamia Robusta

DescriptionCycads World

trunk to 2 m long and 30 cm diameter, with the leaf bases spreading away from the trunk.

Mature Leaves

8 - 30, often in a dense crown, 1.5 - 3 m long, dark green, smooth, glabrous, flat in cross-section, straight to arching in profile.

Male Cones

30 - 50 x 10 - 14 cm, cylindrical, erect, recurved or nearly pendent, grey-brown.

Female Cones

30 - 50 x 10 - 14 cm, cylindrical, erect, grey.

Seeds

About 2.5 x 2 cm, ovoid, the sarcotesta white, smooth.

Distribution and Habitat

Occurs in Belize, Guatemala and Mexico (Oaxaca, Veracruz and perhaps Chiapas). This species grows in the understorey of wet, humid, tropical rainforests.

This species was described in 1847 from plants cultivated in Europe and originating from somewhere in Mexico.

Ceratozamia robusta is the largest and most vigorous species in the genus. It has been included with C. mexicana by some authorities, but is much more robust, with a larger trunk, longer leaves, larger cones and acute tips on the leaflets. It has the widest distribution of any species of Ceratozamia and is also somewhat variable.

Plants from the forests of Belize and Guatemala are the largest of all and often have crowns of relatively lax leaves. Those from Veracruz are smaller and less vigorous than other variants and those from Chiapas fall somewhere in between.

Cultivation

Suited to tropical and warm subtropical regions. A vigorous species which forms impressive clumps when grown in amenable conditions. Young plants make attractive specimens for large containers but must be planted in the ground if they are to achieve their full potential. They require protections from excessive hot sun, with a position receiving morning sun or filtered sun being most suitable. Plants respond vigorously to an abundance of water, regular light application of fertiliser and mulching.

Propagation

From fresh seed and by division of clumps.

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Cycad International | 61 Morris Road, Katherine, Northern Territory, 0850, Australia
Managing Directors : Josef & Karen Perner
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