50 Rhodora [Mancn 
CAROLINA: Asheville, *June", W. W. Ashe. INDIANA: flat woods 
along Muscatatuck River near Weston, Jennings Co., July 14, 1919, 
Deam, no. 28,085 (two sheets); flat woods of the Hennesley bottoms 
near Huntingsburg, Dubois Co., July 18, 1919, Deam, no. 28,321 
(two sheets). 
As already noted in the key, one of the distinguishing points of 
var. texanum is its tendency to obtuse leaf-segments. In the other 
three varieties also there is discernible, in addition to the characters 
above stated, a somewhat vague and far from constant tendency to 
develop distinctive types of foliage. In var. camporum the leaves 
are not only of heavier texture than in the typical form, but their 
segments tend to be broader. In var. Grimesii this tendency is carried 
so far that, in the majority of specimens seen, the upper stem-leaves 
are neither three-parted nor, as often in the other varieties, reduced 
to merely dentate ovate-lanceolate or ovate-rhombic blades distinct- 
ly longer than broad; they are nearly or quite as broad as long and 
shallowly three- to several-lobed, in the most extreme form closely 
simulating leaves of Crataegus rotundifolia. And the segments of all 
the leaves tend to be broader even than in var. camporum. Forma 
glandulosum and f. adenophorum differ from the typical form and from 
var. camporum respectively only in the presence of gland-tipped tri- 
chomes. Plants with the lower leaves pinnate (G. Meyerianum) occur 
in the typical form and in vars. camporum and Grimesii. The original 
G. agrimonioides C. A. Meyer, on which G. Meyerianum Rydb. is 
based, appears from the description to belong with typical G. cana- 
dense. , 
GRAY HERBARIUM. 
ECOLOGICAL POLYMORPHISM IN ENTEROMORPHA 
CRINITA!. 
By A. Brooker KLUGH. 
THE term polymorphism has been used in various senses by differ- 
ent writers. By some it is evidently regarded as synonymous with 
mutation, while others use it merely as an equivalent for great vari- 
ability. The concept of polymorphism, as held by the majority of 
! Read before the Ecological Society of America., at the Toronto Meeting of the 
A. A. A. S., December 29th, 1921, 
