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present day gymnosperms are divided into the four following phyla:

1-Cycadophyta: palm-like trees of tropics/subtropics

2-Ginkgophyta: only a single species: Ginkgo biloba

3-Coniferophyta: cone bearing trees, evergreens: pines, firs, spruce

4-Gnetophyta: consists of 3 genera:

a. welwitschia: in African deserts with only 2 long strap-like leaves

b. Ephedra: desert shrub, souce of alkaloid ephedrine - used to treat congestion of hay fever, Asthma

c. Gnetum: trees or vines with large leathery leaves

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โˆ™ 2010-10-18 05:03:58
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Q: What are the four phyla of gymnosperms?
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