40 
■ 
ical paper appeared from his pen until 1842, when he published in 
the American Journal of Science his monograph of North-American 
Cuscutineae. 
The appearance of this monograph, which was soon republished 
in the Botanische Zeitung and the London Journal of Botany^ estab- 
lished Engelmann*s reputation as a systematic botanist and procured 
for him the correspondence of Hooker and other foreign botanists. 
Several new species were described in this paper, and the genus 
Lepidanche was proposed for a Cuscuta-XxVt plant of the western prairies. 
Cuscuta always interested Dr. Engelmann, and in 1859 he published 
in the Transactions of the St. Louis Academy an elaborate revision 
t of the whole genus, for which he had long been collecting material. 
In 1844 he published in the American Journal of Science a list of 
plants collected by Charles A. Geyer in Illinois and Missouri, in 
which several species were first describe^; and in 1845, 1^ ^'"^^ Jour- 
nal of -the Boston Society of Natural History, in collaboration with 
Asa Gray, an enumeration of plants collected in Western Texas by 
his countryman, Ferdinand Lindheimer, a naturalist attached to the 
German colony of New Braunfels. 
In 1848 was published his account of the plants collected on Dr. 
A. Wislizenus's expedition. The study of this collection exerted a 
. powerful influence upon his subsequent botanical studies. It first 
drew his attention to Cactacece ^xv^Pinus^ which continued to occupy 
his thoughts for the remainder of his life, and of which his knowledge 
was unequalled. As early as 1856, Dr. Engelmann published in the 
Proceedings of the American Academy a synopsis of the Cactacese 
of the territory of the United States. Two years later appeared his 
**Cactaceae of the Boundary/' in the second volume of the United 
States and Mexican Boundary Survey report. This paper, superbly 
illustrated with drawings made (under Dr. Engelmann's direction) by 
^Roethe, is, perhaps, his best-known botanical work. 'Dr. Engelmann 
'studied and described all the collections of Cactacene which, from 
time to time, were made in the Mexican boundary region, and, had 
he lived, would have elaborated the whole order in accordance with 
his latest views of the subject. He even proposed so late as last 
year to pass a considerable time in Northern Mexico for the purpose 
of studying these plants in their native country before finally givmg 
to the world the final results of his long investigations. 
Other difificult genera were studied by Dr. Engelmann. His pre- 
dilections, indeed, were always for the most difificult and perplexmg 
plants, and he willingly devoted himself to such genera only as less 
patient investigators hesitated to take up. Thus he mastered the 
North- American Euphorbiace^, elaborating all recent collections ot 
the family, without, however, undertaking a complete revision of the 
order as represented in this country. He published an elaborate 
and exhaustive paper upon the North-American species of P^'^^' 
and, later, one on the North-American Tso^tes. His pubhshed notes 
upon the •North-American species of Quercus, and upon North- Amer- 
ican Abies, Junipertis of the section Sabina, and upon the genu 
Pinus, contain the most valuable and trustworthy mformation tna 
has appeared upon these plants. In 1873 l^e pubhshed, under tne 
