. Heredity and evolution in plants . teris acquilina); and discon-tinuous, as in the case of the Osmunda family, where agiven species is found in widely separated localities, butnot in the intervening regions. Osmunda regalis (theRoyal Fern), for example, is known from eastern NorthAmerica, central and northern Asia, and Europe; Os-munda Japonica from central and northern Asia and Japanand the cinnamon fern (Osmunda cinnamomea) only fromeastern North America and Japan. The genus Dicrvilla, GEOGRAPHICAL DISTRIBUTION 155 of the Honeysuckle family, is represented in the easternUnited States and C
. Heredity and evolution in plants . teris acquilina); and discon-tinuous, as in the case of the Osmunda family, where agiven species is found in widely separated localities, butnot in the intervening regions. Osmunda regalis (theRoyal Fern), for example, is known from eastern NorthAmerica, central and northern Asia, and Europe; Os-munda Japonica from central and northern Asia and Japanand the cinnamon fern (Osmunda cinnamomea) only fromeastern North America and Japan. The genus Dicrvilla, GEOGRAPHICAL DISTRIBUTION 155 of the Honeysuckle family, is represented in the easternUnited States and Canada by the bush-honeysuckle(Diervilla Lonicera), and in the mountains of the southernStates by D. sessilifolia and D. rivularis; it is not foundelsewhere except in eastern Asia, where it is representedby the shrubs commonly cultivated in temperate Americaunder the name Weigela. In the herbarium of the Brooklyn Botanic Garden aretwo specimens of the cloud-berry, or mountain bramble(Rubus chamamorus), collected in a bog near Montauk. FIG. 72.—Map showing the geographical distribution of the skunk-cabbage, Symplocarpus f&lidus. (After M. L. Fernald.) Point, Long Island, by Dr. William C. Braislin, in is an arctic and sub-arctic bog plant, ranging fromLabrador and Newfoundland to New Hampshire, BritishColumbia, and Alaska; also in Europe and Asia. It wasfound on the Peary arctic expedition as far north as ° 15 north. Its discovery as noted above was unex-pected, and affords an interesting example of discontinuityof distribution. Another striking illustration is the curlygrass fern (Schizcea pusilla), of the Polypodiaceae, found inNova Scotia and Newfoundland, and in the pine barrens ofsouthern New Jersey, but not known to occur between 156 HEREDITY AND EVOLUTION IN PLANTS these two regions. The skunk-cabbage (SymplocarpitsJcetidiis, Fig. 72), species of Magnolia, Hydrangea,Hamamelis (witch-hazel), Liquidambar (sweet-gum), Ara-lia (ginseng), Eupatorium, Onoclea
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