1921] JURICA—DIPSACUS 145 
Summary 
1. The mode of branching is uniform for each individual plant. 
2. New branches arise from the axils of clasping leaves. 
3. The capitulum, or floral head, which terminates each branch 
is the first to make its appearance in the development of a branch. 
. The primordia of the bracts forming the involucre of the 
capitulum appear early, followed quickly by the initials of clasping 
eaves. 
5. A twofold region of elongation sets in immediately above 
and below the initials of the clasping leaves of the new branch. 
6. Secondary branches appear very early in the axils of the 
leaves clasping new branches. 
7- The initials of the floral bracts appear before the papillae 
of the individual flowers, which they subtend. 
8. The flowers are arranged in the form of a spiral. 
g. The order of succession of floral members is corolla, stamens, 
calyx, and carpels, the calyx appearing almost simultaneously with 
the stamens. 
10. The initials of a calyx-like involucel investing the ovary 
appear shortly after the initials of the calyx. 
St. Procorrus CoLLEGE 
Liste, Int, 
LITERATURE CITED 
- CouLTER, J. M., and CHamBerzatn, C. J., Morphology of angiosperms. 
1903 (p. 17, fig. 3). 
2. Comstock, A. B., Handbook of nature study, pp. 586-588. rorr. 
GeorotA, Apa, A manual of weeds, p. 403. 1910. 
4 HANNAH, MARGARET, Comparative study of epigyny in certain Mono- 
cotyledons. and Dicotyledons. Trans. Amer. Micr. Soc. 35:207~-220. 
Ig16. 
Kirkwoop, J. E., The comparative embryology of the Cucurbitaceae. 
Bull. N.Y. Bot. Gard. 3:313~-402. pls. 58, 69. 1904. 
6. Martin, G. W., Development of the flower embryo sac in Aster and 
Solidago. Bor. GAz. 17:353-358, 406-411. 1 
MERRELL, W. D., A contribution to the te aa of Silphium. Bor. 
GAZ. 29:99-133.- pls. 3-10. 
8. VELENOvsSKY, Jos., Srovnavaci Morfologie. 2: p. 504. 1907. 
lal 
ow 
. 
ss 
ry 
