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embryo peripheral, surrounding mealy perisperm. Nearly worldwide, most abundant in tropics, subtropics, and warm-temperate regions, evidently absent from

medium-sized trees. Most species occur in open habitats, ranging from dry to wet, with a few species of Ludwigia aquatic, from the tropics to the deserts of

fragilis) and 50º latitude in the Southern Hemisphere (E. F. Anderson 2000). Whereas most cacti are terrestrial, in the tropics several genera are epiphytic

except in desert areas. In the tropics, especially in South America, the family is diverse in upland and montane areas, and notably diverse in such genera

Worldwide except lowland tropics. Species about 300 (76 in the flora). Most Ranunculus species are poisonous to stock; when abundant, they may be troublesome

obscure in mature sori. Spores brownish, cristate, rarely rugose. x = 38, 39, 41. Mostly north temperate regions and higher elevations in the tropics. Woodsia

Ultimately, however, the fate of most species in nature is tied to the health of the habitats in which they live. Most conservationists feel strongly that

Texas. In terms of total biomass, it may actually constitute our most abundant pteridophyte. In general, in desert regions pteridophytes grow in the protection

America and Asia (most only in eastern and southeastern Asia). Another 68 genera are found in eastern North America and Eurasia and also in western North America

 Glyptostrobus and Metasequoia became abundant, the latter the most frequent and widespread member of the Taxodiaceae (Cupressaceae in the flora) in North America from Cretaceous