158 
IOWA ACADEMY OF SCIENCE 
approximately as follows : figure 1, 35 • figure 2, 105 ; figures 3, .4, 7, 8,. 
9, 10, 11 and 12, 210. 
The abbreviations employed in describing figures are as follows : 
i, involucral bract; f, floral bract; p, pistillate flower; s, staminate flower; 
c, coralla; 1, carpels; y, style; m, stamens-; r, abortive stamens; e, epi- 
Diagram of capitulum. 
Longitudinal section of one-half of capitulum. 
Young staminate flower in longitudinal section. 
Nearly mature staminate flower in longitudinal section. 
Floral diagram of staminate flower at maturity. 
Fused walls of two adjacent stamens in cross section. 
Young pistillate flower showing appearance of corolla. 
Young pistillate flower showing appearance of carpels. 
Immature pistillate flower showing beginnings of rudimen- 
tary stamens. 
Nearly mature pistillate flower in longitudinal section. 
Abnormal flower in longitudinal section. 
Floral diagram of abnormal flower. 
dermis. 
Fig. 
1. 
Fig. 
2. 
Fig. 
3. 
Fig. 
4. 
Fig. 
5. 
Fig. 
6. 
Fig. 
7. 
Fig. 
8. 
Fig. 
9. 
Fig. 
10. 
Fig. 
11. 
Fig. 
12. 
Since 
this 
actions and Proceedings of the Botanical Society of Edinburgh for 1913, a paper 
by Dr. K. von Goebel on “The Inflorescences of the Ambrosiaeeae.” In this no men- 
tion is made of Iva, but there is reference to an article on the same subject by 
S. Rostowzew in Bibliotheca botanica Heft 20. The latter paper is primarily a study 
of the systematic position of the members of this group, and presents certain of the 
facts noted above. The author attempts however no interpretation of the rudiments*, 
etc., nor does he discuss the origin of the inflorescence of this form. 
