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They are fairly salt- and drought-tolerant but should be protected from extreme cold. They should occasionally be fed with palm food. After Cycas revoluta, this is probably the most popular cycad species in cultivation. In temperate regions, it is commonly grown as a houseplant and, in subtropical areas, as a container or bedding plant outdoors.
Dioon spinulosum, giant dioon, or gum palm, is a cycad endemic to limestone cliffs and rocky hillsides in the tropical rainforests of Veracruz and Oaxaca, Mexico. [1] [2] It is one of the tallest cycads in the world, growing to 12m in height. The tree is found at low elevations to 300 m above sea level. [1]
Dioon edule, the chestnut dioon, is a cycad native to Mexico, also known as palma de la virgen. Cycads are among the oldest seed plants and even pre-date the dinosaurs. [3] It belongs to the Zamiaceae plant family within the order Cycadales. The genus name "Dioon" means "two-egged", referring to the two ovules (see photo below).
While there are more than 200 species of cycads, only one is native to Florida, and only a couple are popular landscaping plants in our area.
The sperm of members from the genus are large, as is typical of cycads, and Z. roezlii is an example; its sperm are approximately 0.4 mm long and can be seen by the unaided eye. [11] It was long believed that Zamia plants, like all cycads, relied completely on wind pollination.
Macrozamia riedlei grows as a tree or trunkless low growing cycad (but is usually trunkless) [2] [4] attaining a height between 0.5–3.0 metres (1 ft 8 in – 9 ft 10 in). [2] Between 12 and 30 glossy mid- to dark-green leaves emerge from its crown, each reaching 1.2 to 2.2 metres (3 ft 11 in to 7 ft 3 in) long and bearing 92–150 pinnae. [ 4 ]