44 



Pine-barrens extend as far west as Texas, and there ought to 

 be some species of pine-barren plants confined to Louisiana and 

 Texas, but too little is known of the flora of those parts as yet. 



Plants of muddy swamps seem from all accounts to be most 

 numerous in the Mississippi embayment of the coastal plain, 

 from about the mouth of the Ohio River southward. Charac- 

 teristic species of this region, most of them woody plants, are : 



Taxodium distichum, Echinodorus radicans, Anindinaria macro- 

 spernia, Hymenocallis occidcntalis, Lcitncria floridana, Hicoria 

 Pecan, H. aqiiatica, Querciis MicJiauxii, Q. lyrata, Planera 

 aquatic a, Celtis occidcntalis, Bnitniichia cirrhosa, Platanus 

 occideiitalis , Cratacgiis viridis, C. apiifolia, Amorpha friiti- 

 cosa, Ilex decidiia, Acer saccJiarimun {dasycarpuvi), Berchcviia 

 scandeiis, Nyssa iiniflora, Bimielia lycioides, Adelia acuminata, 

 Trachelospennuvi diffornie, Asclcpias percnnis, Gonolobus laevis, 

 VincetoxicJivi gonocarpos, Bignonia crucigera, Tccoma radicans, 

 Conocliniuvi coelestinnm, Mikania scandcns, Enpatoriuvi seroti)niin. 



Most of these are not wholly confined to the coastal plain, but 

 they are more common there than elsewhere, and few if any of 

 them ever ascend more than i,ooo feet above sea-level. Going 

 eastward in the coastal plain they become perceptibly scarcer. 

 There are fewer of them in Georgia than in Alabama, still fewer 

 in the Carolinas, and only about half of them reach Virginia, 

 though there is nothing in the climate to hinder them, as far as 

 known. 



In contrast to these five or six evident centers a few of the re- 

 gions with poorer flora may be mentioned. 



The coastal plain of Delaware, Maryland and Virginia seems 

 to lack many of the species common to New Jersey and the 

 southern pine-barrens, though some of them will probably be 

 reported when those parts are better explored. South Carolina, 

 too, seems to be a rather uninteresting state floristically, and 

 there are perhaps no good species confined to it. The upper 

 fourth of the coastal plain of Georgia {i. e., the part outside of 

 the pine-barrens) has quite a diversified topography and vegeta- 

 tion, but practically all the plants growing there range either 

 northward to the mountains or coastward to the pine-barrens. 



