311 
indicated by Prof: Millardet of Bordeaux, and is fully confirmed by 
‘my observations made on specimens from all parts of their geo- 
graphical area. 
The dissepiments or diaphragms, as they are called, which at each 
node interrupt the medullary tissue, and which are best studied in 
vines of the previous year, are in riparia very thin, only 4 to $ of a 
line in thickness, while in cordifolia they are }-1 line thick, and in. 
. aestivalis a little thicker yet. 
Pursuing these investigations through all the species of Vitis 
attainable, I find that the Rocky Mountain V7#’s and that from Lake 
Superior have been correctly referred to riparia, while V. Arizonica, 
about the relationship of which I had some doubts, is certainly dis- 
tinct from riparia. 
All true Vitis have such diaphragms at each node, while all the 
species of Ampelopsis and of Cissus are destitute of them. But the 
startling fact appears that V. vudprna of the South in this character 
is different from all other Vi#’s species and affiliates with Cyssus, its 
pith being continuous and not interrupted. 
V. cordifolia, thus completely separated from riparia, approaches, 
strange as it may seem, close to aestivalis in the character of the 
diaphragm, in its period of flowering, and even in its seeds, and the 
connection seems to be made by that western entire-leaved and 
‘small and black-fruited form of aestivalis, which I have distinguished 
as cinerea, to which downy-leaved forms of cordifolia approach 
almost too closely. 
All the species of V7#’s contain in their foliage more or less of a 
fragrant principle, most probably Cumarin, which the dried leaves 
retain with such tenacity, that even after fifty years in the herbarium 
they exhale this very distinct odor. In cordifolia I find it much 
more strongly developed than in any other species. 
St. Louis, Mo. G. ENGELMANN, 
§ 310. Dr. Rugel——We have very lately received intelligence of 
the death of Dr. Rugel in Upper East Tennessee. He was a Ger- 
man sent to this country in about 1842, by Mr. R. J. Shuttleworth, 
to collect shells and plants for him, which Dr. R. did in Cuba, 
Florida, Texas, Georgia and Tennessee. Dr. Rugel was a good col- 
lector. Several of our North American Helices were discovered by — 
him, as noted by Mr. Shuttleworth with the published descriptions— 
one species named Ae/ix Rugeli. He seems to have been the only 
‘one who has detected the singular Lechea divaricata of Shuttleworth, 
one of the rarest of American plants, if indeed it is not a very pecu- 
liar form of Z. major, as is barely possible. The only specimen we 
believe in this country is in Dr. Gray’s Herbarium, unless there be 
‘one in Rugel’s own collection, It was found near the Manatee 
River in Florida. u 
Dr. Rugel left a large collection of both shells and plants. Of 
the former many are not named, and the locality of some not given. 
The plants are in better order; they are labelled and catalogued. 
There are 3,000 or more European plants, and a large collection of 
American, 
. 
