HARPER: VEGETATION OF THE HEMPSTEAD PLAINS 281 
Other marked similarities to our area, floristic or vegetational, 
are found in the serpentine barrens of Pennsylvania and Maryland, 
discussed by Harshberger,* Pennell,} and Shreve,t and the sand 
areas of Illinois, described by Gleason and others. (The typical 
Illinois prairies, however, have much richer soil and more luxuriant 
vegetation, with more broad-leaved herbs and almost no shrubs.) 
Still farther west we can find a number of resemblances in the 
sand-hills of western Nebraska, described by Rydberg|| and Pool. 4 
The less typical sand-hills of northeastern Colorado, visited by 
the writer under the guidance of Dr. Shantz in August, 1915, are 
probably more like the Hempstead Plains than are those of 
Nebraska, for the vegetative covering is more continuous. The 
dominant grass on the Colorado sand-hills is the same as on the 
Hempstead Plains (or at least taxonomists have not yet separated 
them). The regular short-grass prairie in the same neighbor- 
hood also has some features in common with that under discussion. 
Instead of our Baptisia tinctoria there is another leguminous plant 
of much the same aspect, namely, Psoralea tenuiflora.** The simi- 
larity of roadside conditions there and on Long Island has already 
been mentioned under the head of weeds. 
The gravelly prairies south of Puget Sound, described by 
Piper,tf resemble ours in being level and grassy, with scattered 
oaks, and even have a species of Sericocarpus, the only member of 
the genus that grows outside of the eastern United States. 
Considering briefly the southeastern states, the dry fields of 
Middle Georgia have several of the same plants as the Hempstead 
Plains uplands, and the prairie meadow plants are pretty well 
* Science II. 18: 339—343. Sept. II, 1903. 
+ Proc. Acad. Nat. Sci. Phila. 62: 541—584. 1911; 64: 520-539. 1913. 
t Plant Life of Md. 213-215. pl. 20. 1910. The writer had opportunity to 
Baltimore is by Dr. Н. Н. Hayden in Am. Jour. Sci. 24: 349-360. 1833. 
$ Bull. Ill. State Lab. Nat. Hist. 7: 149-194. Jan. 1907; 9: 23-174. pl. 1-20. 
1 Contr. U. S. Nat. Herb. 3: 133-200. pl. 1, 2. 18095. 
4 Minn. Bot. Stud. 4: 189-312. pl. 26-40. 1914. Reviewed in Bull. Am. Geog. 
Soc. 47: 873-874. Nov. 1915. 
** For descriptions of prairie vegetation in Colorado, see Shantz, U. S. Bur. Pl. 
Ind. Bull. 201, 1911; particularly, plate 3. fig. І, and plate 4, Mer. 
+t Contr. U. S. Nat. Herb. тт: 42-44. pl. 9, 10. 1906. 
