176 Miscellantes. 
Flora pan. . . Flora of North America. 
Diervilla, several species, Diervilla Tournefortii. 
Viburnum tomentosum, Viburnum lantanoides. 
Wisteria (or as it should be Seed 
Japonica, and two other species, 
Paulownia imperialis, Catalpa cordifolia. 
While about half the species thus far published are nearly related 
to (chiefly characteristic) North American plants, only eight, besides 
those given above, belong to genera which have no representatives in 
this country. The list might be greatly extended by comparisons 
from other sources. ‘Thus Hoteia Japonica of Morren and De 
Caisne, (which belongs to the earlier established Astilbe, Don,) which 
was by Thunberg mistaken for Spirwa Aruncus, closely resembles our 
own Astilbe decandra, which has been more than once confounded 
with Spirea Aruncus. On some future occasion we hope to make a 
somewhat extended comparison between the Flora of temperate 
North America, and that of Japan and Middle Asia. 
Wistaria frutescens. 
8. Grisebach, Genera et Species Gentiancarum, adjectis obser- 
vationibus quibusdam phyto-geographicis. (Stuttgart and Tubingen; 
1839, pp. 364, 8vo.)—The most useful works in natural history at 
the present day are monographs of separate orders, when prepared 
from sufficiently extensive materials; and this account of the known 
species of Gentianaceous plants, by Dr. Grisebach, now of Gottin- 
gen, is one of the latest and best works of the kind. The typograph- 
ical arrangement, however, is not what it ought to be, and this is 
an important matter in books of the kind. -In this respect, as in 
every other, the most perfect model for a monograph is Mr. Ben- 
tham’s Genera et Species Labiatarum. Dr. Grisebach first gives 
the natural character of the order, in detail; then follow some intet- 
of the theory of floral structure, and is then verified by actual exam- 
er and thus the theory is confirmed. The stamens in their early 
distinct from the petals, although at length the filaments ad- 
