450 BOTANICAL SURVEY OF DISMAL SWAMP REGION. 



2. PALUSTRINE SPECIES. 



Dryopteris(Aspidi><m)spiuulosadilatata. *Carex canescens, 

 Panicularia (Glycerin) brachyphylla. GauUheria procumbent. 



*Paniculai*ia obtusa. *Utricularia clandestine 



Panicularia pallida. 



'■A. NUN PALUSTRINE SPECIES. 



Carer costellata. Potentilla pumila. 



Juncoides (Luzula) pilosum. Agrimonia striata. 



Cypripedium acaule. Valerianella chenopodi folia. 

 Salix fluviatilis (tongifolia). 



NORTHERN LIMITS OF AUSTRORIPARIAN PLANTS PEACHING THE 

 DISMAL SWAMP REGION. 



The following tables give the northern limit of most of the charac- 

 teristic species belonging to the Coastal plain or Anstroriparian area, 

 which extend northward along or near the coast as far as the south- 

 ern border of North Carolina or farther. In some cases there is room 

 for doubt as to whether the species is really of Austroriparian rather 

 than of Carolinian origin. But the great majority of the species tabu- 

 lated unquestionably reach their greatest development and widest 

 distribution in the former zone. 



A number of signs are used in order to denote the further distribu- 

 tion of the given species. Thus an asterisk (*) indicates that the 

 species so designated also extends into the Tropical Zone, or at least 

 into subtropical parts of Mexico or the West Indies. A dagger (f) is 

 appended to the names of species which range northward in the 

 Mississippi Valley to latitude 36° or farther. A double dagger (J) 

 denotes a strand plant. Species of that formation usually have a wider 

 range than is embraced within the limits of a single life zone. Species 

 indicated in the columns of the table by a cross (x) are definitely 

 known to extend northward to the latitude given. In almost every 

 case such record of northward range is based upon the examination 

 of reasonably authentic specimens. A query (?) in one of the columns, 

 opposite the name, indicates that the species is reported to range thus 

 far northward, but is not certainly known to do so. A number of 

 these Austroriparian plants also occur in more or less limited areas 

 in the midst of the Carolinian, or even of the Alleghanian (Transition) 

 zones, chiefly in the Appalachian area, or farther west. Such stations 

 are to be regarded as outposts of the main Austroriparian flora, for 

 which local conditions of climate or soil exposure (or of both) are 

 responsible. 1 



1 See Kearney, The Lower Austral element in the flora of the southern Appa- 

 lachian region, Science, n. ser., vol. 12, p. 830 (1900). 



