458 



BOTANICAL SWUVKY OK DISMAL SWAMP REGION. 



RELATIONSHIP TO OTHER FLORAS. 



Let us now luni to the broader relationships of the flora. The total 

 number of indigenous genera of Pteridophta and Embryophyta of 

 which representatives were collected or observed in the Dismal Swamp 

 region is 330. Of these there are — 



Endemic 



Endemic in North America (including Mexico and the Antilles) 17 



Endemic 

 Endemic 



n eastern North America (east of the Rocky Mountains) . . , 



26 



n America (North and South) ... .. 27 



n eastern North America and eastern (chiefly extratropical) Asia 26 



Endemic in the Northern Hemisphere 44 



136 

 Of wider distribution 194 



The distribution of the less widely dispersed genera is shown in the 

 following table, the names of monotypic genera being preceded by 

 an * and those of genera almost but not quite confined to the partic- 

 ular category being followed by a ± : 



Distribution of genera of limited range. 



Eastern North 

 America. 



Nor tli America, 



Mexico, and the 



Antilles. 



Taxodium. 



America, North 

 and South. 



Eastern North 

 America and east- 

 ern Asia. 



Northern Hemi- 

 sphere. 



Trlplasis. 



Philotria(Elodea). 



* Zizania. 



Osmunda. ± 



Katotiia. 



Yucca. 



Uniola. 



Tipularia. 



Wooiiwardia. t 



* Dulichium. 



Prosorpinaea. 



Distichlis. ± 



Saururus. 



.1 uniperus. 



Peltandra. 



Xolisma(Lyonia). 



Tillandsia. 



Nelumbo. 



Ammophilu. 



Uvtilaria. 



Monarda. 



Pontederia. 



Magnolia. 



AcoruB. 



Limodorum (Ca- 



Eoellia ( Pycnan- 



Atamo^co (Zeph- 



Liriodendron. 



Lilium. 



lopogOIl ). 



themum). 



yranthes). 



Decumaria. 



Culygouatuin. 



Hicoria. 



Pentstemon. ± 



Sisyrinchium. 



Itea. 



Iris. 



Asiiiiiiia. 



Conopholis. 



Phorad udroti. 



Hamamelis. 



Jnglans. 



'Sassafras. 



Houstonia. 



Brad bury a (Cen- 



I ji rin id am bar. 

 Fafcata (Amphi 



Populus. 



^Sunguinuria. 



Sit iliiis i I'yrrliii 



trosema). 



Ostrya. 



Aronia. 



pappus*. 



Kosteletzkya. 



carpaea). 



( 'urpinus. 



Baptisia. 



Chrysopsis. 



Ascyrum. 



Apios. 



Alnus. t 



Cyrilla, 



Eutliamia. 



Opuntia. 



Parthenocissus. 



KiC'iis. 



* Sa rot lira. 



Sericocarpus. 



( lenothera. 



Triadenum (Elo- 



Castanea. 



Hudson! a> 



Ionactis. 



Gaylussacia. 



des). 



(Juercus. 



1 'llllllS. 



Leehea. t 



Iva. 



* Polypremum. 



Ptilimnium (Dis- 



* Deeodon. 



liudbeekia. 



Gonolobus. 



copleura). 



Morns, 



Rhexia. 





Verbena. ± 



Nyssa. 



Comandra. 



Kalmia. ± 





Mimulus. ± 



Azalea. + 



Asaruin. 



♦Oxydendrum, 





Gerardia. 



Pieris. 



Sagina. 



Sabbatla. 





Bignonia. 



Epigaea. 



Ammodcnia (Hon- 



Bartonia. 





Wdlngbaeya (Mi- 



Chionanthus. 



kenya). 



Dasystoma. 





fcania). 



Gelsemium. 



Nyniphaea (Nu- 



Adopogon (Kri- 





Baccharis. 



Tr a c h o 1 o s p e r- 



phar). 



gia). 





Parthenium. 



mum. 



Oakile. 



Lacinaria (Lia- 





Borrichia. 



* Phryma. 



Spiraea. 



tris). 





Heliauthus. 



Mitchella. 



Fragaria. i 



Boltonia. 







Nabalus. 



Potontilla. »- 



Silphium. 









Geum. + 



Agrimonia. I 



Rosa. 



Mains. 



Anielanchier. 



Crataegus. ± 



('en-is. 



Euonymus. 



Circaea. 



Cicuta. 



Cornus. t 



Chimaphila. 



Ox y coccus. 



Praxinus. 



