390 BOTANICAL GAZETTE [NOVEMBER 
the conclusion that the leaf of D. rotundifolia is the original type of 
leaf from which those of other species have arisen. AMES (1) 
showed the possibility of propagating Drosera species from old 
leaves cut from mature plants. He worked with D. filiformis, 
D. intermedia americana, D. rotundifolia, and D. binata. He 
notiged that when mature leaves fell.on the sand in which these 
plants were growing, adventitious buds appeared. The condition 
most favorable to the development of these buds in his opinion is a 
low temperature. 
Drxon (2), like Ames and Leavirt, was able to obtain adventi- 
tious buds on leaves of D. rotundifolia. We differs with Grout in 
that he asserts that adventitious buds appear only when the parent 
plant is allowed to dry out. He found that under these conditions 
the leaves of D. rotundifolia produce adventitious buds on the 
dorsal surfaces after 2 months. He also found that new plants 
may arise in the axils of leaves and between the petiole and main 
axis of the inflorescence as axillary buds. GoEBEL (4) showed 
further that a portion of a leaf of D. binata could produce adventi- 
tious buds. He cut an arm of a leaf of D. binata and placed it on a 
moist substratum. After a time he observed the appearance of 
adventitious buds whose leaves were rounded and similar to those 
of D. rotundifolia, and he states that these leaves agree in shape 
with those of the young plants of D. binata. 
Miss Rosinson (17) repeated the work of Leavitt, AMES, and 
GOEBEL, with similar results. She describes the appearance of 
roots on the young adventitious buds which appeared on leaves of 
D. rotundifolia placed in sphagnum. She also found that leaves 
placed with the dorsal surface down developed buds on the upper 
or ventral surface. Miss Roprinson holds that these adventitious 
buds are in no way connected with the vascular system of the 
parent plant. 
SALIsBuRY (18) found the appearance of adventitious buds in 
D. rotundifolia and D. intermedia Hayne. Signs of these buds 
appear on the leaves of these 2 plants in the late spring of the yeaT 
following their removal to the greenhouse. The age of the leaf 
which bears these buds may vary. The first leaf rudiment appears 
as a small protuberance on the dorsal surface of the leaf. This is 
