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Hawaii, introduced in other tropical and temperate regions of the world. Species 32 (15 in the flora). None of the North American species occurs in South

extension of the areole reaching only part way to the axil of the tubercle, with the flower produced at the adaxial end of the extension. In some genera

Islands, mostly in arctic, boreal, and temperate regions, introduced in Australasia, Oceania. Species ca. 450 (113 in the flora). Species of Salix have been

climates. One of these species, Colocasia esculenta, is widespread enough to warrant full inclusion in the flora, but other introduced species of Araceae are

America. The taxonomy of woody bamboos has developed slowly because of the scarcity of flowering material, and the distribution of the species in predominantly

species cultivated and introduced in temperate and tropical regions worldwide. Genera 130, species ca. 2500 (12 genera, 18 species in the flora). Some California

misidentifications in herbaria and the literature, obscure the distribution patterns of some Amaranthus species in North America. Weedy and introduced species of Amaranthus

Distribution of the Pines of the World. Washington. [U.S.D.A., Misc. Publ. 991.] Duffield, J.W. 1952. Relationships and species hybridization in the genus Pinus

on experience in other parts of the world. The former is a serious agricultural pest in southern Australia, where it was introduced in the 1830s. Emex spinosa

growing in the temperate regions of the Northern Hemisphere and on tropical mountains are mostly perennials, with the annual species predominantly in warmer

from the wild. The true lilies are distributed circumboreally, particularly in mountainous regions, and reach their southern limit in the tropical mountains

F. Thorne BECAUSE of the basically temperate nature of the flora of the United States of America and Canada, the floristic richness of this huge area is

begins with the floras of the Maastrichtian stage of the Upper Cretaceous, 70--65 Ma, and progresses forward in time through the Tertiary to 2 Ma, the end of

damage, and of its effects on the quality of life. A vivid general review of the multifaceted nature of the human assault on the natural world is presented

are most common in upland areas between the mountains and wet coastal plain in Alaska and the Yukon. The presence of prominent tussocks of Eriophorum vaginatum (tussock

wealth, could find the means to study the natural and physical world. The philosophy of science that greeted the discovery of the New World was one hardened

measurements of the ratio of 18O to 16O in the fossil shells of marine plankton reflect long-term oscillations in the volume of glacial ice and indicate that