750 THE AMERICAN NATURALIST. [Vou XXXIII. 
As a surgeon in the French army during its occupation of Mexico 
he traveled in nearly every part of that country, and was always busy 
making observations and notes on the cacti. On his subsequent 
return to France he gathered together, in the gardens of Mr. Robert 
Roland Gosselin, a large collection of these plants, not only from 
Mexico, but from other countries as well; and with these he con- 
tinued his study of the order, until now he is justly considered one 
of the best, if not the first authority on this family of plants. He 
was a constant correspondent of the late Dr. George Engelmann, 
the acknowledged American authority on the order, and their free 
exchange of opinions and of specimens was of invaluable aid to 
each. i 
Since a botanist would hardly expect to find original descriptions 
in a horticultural dictionary, it seems wise that these published by Dr. 
Weber be brought more conspicuously before the botanical public, 
and to that end they are here appended. The dictionary, not as yet 
completed, has thus far been issued in /vrazsons of thirty-two pages 
each. The date of issue of each “vraison, as far as published, has 
been kindly furnished in a letter from the author, and the date given 
in the citation of the species is made to correspond. 
Anhalonium trigonum Weber in Bois’s Dictionnaire a’ Horticulture, 
90, June, 1893. ‘This, in compliance with the rules of nomencla- 
ture, becomes Ariocarpus trigonus K. Sch. Cereus Pasacana Web. 
l.c. 281, published some time between Feb. 1894 and Feb. 1895 ; the 
exact date is not known. ‘This enormous Cereus is the giant of the 
Argentine Cordilleras, as Cer. giganteus is that of the Mojave desert. 
Echinocactus heterochromus Web. l.c. 466, Sept. 1896. Echino. 
Peninsula Web. l.c. 467, Sept. 1896. chino. Saussieri Web. l.c. 468, 
Sept. 1896. chino. microspermus Web. l.c. 469, Sept. 1896. Echino. 
Schickendantzti Web. l.c. 470, Sept. 1896. Mamillaria plumosa Web. 
l.c. 804, Jan. 1898. Mam. valida Web. l.c. 806, Jan. 1898. Opuntia 
hyptiacantha Web. l.c. 894, April, 1898. Op. myriacantha Web. l.c. 
894, April, 1898. Of. pilifera Web. l.c. 894, April, 1898. Op. Quipa 
Web. l.c. 894, April, 1898. Of. guitensis Web. l.c. 894, April, 1898. 
Op. ursina Web. l.c. 896, April, 1898. In this the specific name is 
suggested by the dense covering of long, coarse hair-like spines, which 
also give it the universally accepted common name of “Grizzly Bear 
Cactus.” Op. australis Web. l.c. 896, April, 1898. Op. Schickendantsii 
Web. l.c. 898, May, 1898. Op. Spegazsinii Web. l.c. 898, May, 1898. 
Pereskia Argentina Web. l.c. 938, July, 1898. Per. Guamacho Web. 
l.c. 938, July, 1898. Per, panamensis Web. l.c. 939, July, 1898. Per. 
