244 
Eastern Asia and North America, especially Atlantic North 
America. The following genera or species of Berberidaceae are 
common to these two areas :— 
Podophyllum (P. peltatum in Canada and E. Un. States; five 
species in China and Himalaya). 
Diphylleia (D. cymosa, high altitudes, Virginia to Georgia and 
Tennessee, and in Central and Western China; D. Grayi in 
apan). 
Achyls (Pacific N. Amer, and Japan; 2 very closely allied 
species, A. triphylla, DC., and A. japonica, Maxim., respec- 
tively). 
Caulophyllum (C. thalictroides, Atlantic N. Amer. and N.E. 
Asia and Central China). 
I give below a revised description of the genus and single species 
of Plagiorhegma. 
Plagiorhegma, Mazim. Prim. F|. Amur, 34, t. 2 (1859) ; descr. 
emend. 
Herba polycephala, rhizomate perenni tenui suberecto foliorum 
basibus vaginantibus membranaceis costatis persistentibus induto. 
coriacea, ab apice fere usque ad basin oblique dehiscens. Semina 
breviter arillata, arillo carnoso demum lacerato. 
rm. | 
J effersonia dubia, Benth. et Hook. f. ex Baker et Moore in 
Journ. Linn. Soc. xvii. 377 (1879); Gard. Chron. Lxiii. 149, fig. 
68 (1918). J. manchuriensis, Hance jin Journ. Bot. ix. 258 
2S eles iin 
Oe arg a »& distinct family included by Bentham and 
