eae ia mg 
NOTES AND OBSERVATIONS. 147 
8. THE MISSOURI DOGBANES. 
BY WILLIAM TRELEASE. 
The discovery of Apocynum androsaemifolium by Mr. 
Geo. W. Letterman, in one locality at Allenton, Mo., 
where A. cannabinum is abundant, gave the opportunity in 
May, 1895, to make photographs from which the accom- 
panying plates have been made, and to confirm Mr. Letter- 
man’s observations on their different manner of growth. 
At Allenton, both species grow on the rocky hills, in or 
about thickets of various shrubs and small trees. In A. 
cannabinum the main stem is percurrent, and the branches 
relatively short from the axils of large leaves, which, on 
both stem and branches, are ascending, and the greenish- 
white flowers with short suberect corolla lobes are densely 
clustered in the upper axils. In A. androsaemifolium the 
stem is more or less spirally dichotomous above, and even 
the lower branches are elongated and divergently ascend- 
ing, the leaves of the main stem are relatively short, and, 
like the larger ones of the branches, drooping or quite 
pendent, while the larger bell-shaped white or pinkish flow- 
ers with recurved segments are much more loosely clustered, 
forming more showy terminal cymes. 
Since the preparation of the foregoing note and the 
accompanying illustrations, Professor Greene* has well 
indicated the differences between A. androsaemifolium and 
A. cannabinum, in his diagnosis of A. medium and A. 
album, two species of the habit of the latter but differing 
in details,— neither of which has yet been recognized in 
Missouri material. 
* Pittonia 8: 229. 1897. é 
