Zamia

Taxobox
name = "Zamia"

---

image_width = 250px
image_caption = "Zamia furfuracea"
regnum = Plantae
divisio = Cycadophyta
classis = Cycadopsida
ordo = Cycadales
familia = Zamiaceae
genus = "Zamia"
genus_authority = Miq.
subdivision_ranks = Species
subdivision = See text

"Zamia" is a genus of cycad of the family Zamiaceae, containing around 50 species, native to North, Central and South America. Species occur as far north as Georgia in the United States ("Z. integrifola"; the only cycad native to the United States) to as far south as Bolivia ("Z. boliviana").

The genus comprises deciduous shrubs with aerial or subterranean circular stems, often superficially resembling palms. They produce spirally arranged, pinnate leaves which are pubescent, at least when young, having branched and simple, transparent and coloured hairs. The articulated leaflets lack a midrib, and are broad with subparallel dichotomous venation. Lower leaflets are not reduced to spines, though the petioles often have prickles. The emerging leaves of many "Zamia" species are striking, some emerging with a reddish or bronze cast ("Z. roesli" is an example). "Zamia picta" is even more distinctive, being the only truly variegated cycad (having whitish/yellow speckles on the leaves).

"Zamia" sporophylls are born in vertical rows in cones, and the megasporophyll apices are faceted or flattened, not spinose. The fleshy seeds are subglobular to oblong or ellipsoidal, and are red, orange, yellow or rarely white. The endosperm is haploid, derived from the female gametophyte. The embryo is straight, with two cotyledons that are usually united at the tips and a very long, spirally twisted suspensor.

The sperm of the genus are large, as is typical of cycads, and "Zamia roezlii" is an example; its sperm are approximately 0.4 mm long and can be seen by the unaided eye [http://waynesword.palomar.edu/ww0601.htm] .

All the species of "Zamia" produce leafy crowns of foliage that make them choice garden specimens and most varieties branch heavily in age to produce handsome clumps. With a few exceptions, most "Zamia" species are found in warm, humid, tropical rainforest habitats, growing in the forest understory. However, many species are still fairly adaptable, performing quite well in cultivation, especially in subtropical areas. All species need good drainage and protection from the cold.

At least one species, "Z. pseudoparasitica", grows as an epiphyte in the branches of trees.

The name "Zamia" comes from the Greek "azaniae", meaning "a pine cone".

Species (incomplete list)

* "Zamia acuminata"
* "Zamia boliviana"
* "Zamia encephalartoides"
* "Zamia fairchildiana"
* "Zamia fischeri"
* "Zamia furfuracea", Cardboard Zamia
* "Zamia gateley scrabulous"
* "Zamia hymenophyllidia"
* "Zamia integrifolia", Florida Coontie, Florida Arrowroot (also "Z. floridana")
* "Zamia ipetiensis"
* "Zamia loddigesii"
* "Zamia montana"
* "Zamia polymorpha"
* "Zamia portoricensis"
* "Zamia pumila", Dominican Zamia
* "Zamia roezlii"
* "Zamia skinneri"
* "Zamia vazquezii", Dwarf Mexican Zamia
* "Zamia verschaffeltii"
* "Zamia wallisii"

References

* [http://plantnet.rbgsyd.gov.au/PlantNet/cycad/zamkey.html The Cycad Pages: Genus "Zamia"]
* [http://lsvl.la.asu.edu/plb306/Zamia_Ada.html "Zamia", by Ada Welsch]