THE CROWFOOT SERIES 377 



family from which it derives its name. It is distinguished 

 from the other orders with monoecious inflorescences, staminate 

 amcnts and pistillate heads, by having the -perianth leaves or 

 the epigynous torus adherent to the bractlets and bract of each, 

 and the ovary with but one cavity and one ovule. 



The formula of Juglandales is given on pages 414, 415. 



127. The willow family (Salicaceae). Examples: willow 

 (Figs. 228 I, II, pages 243. 244) and poplar (Fig. 253, 

 page 264). 



Formulas of Populus, Salix, and Salicacese are given on pages 

 414, 415. 



Much simpler flowers are here show^n than any previously 

 mentioned, although scarcely any new features are pre- 

 sented. The torus while cup-like in the poplars, is represented 

 in the willows by one or two glandular projections which 

 secrete nectar. It is plain that a cup divided, or failing to 

 develope, at one or two places would be reduced to such flat 

 projections. 



A peculiarity of the fruit of both genera is that its two 

 carpels dehisce along their dorsal sutures exposing the small 

 hairy seeds to the wind. 



This family which contains only the two genera mentioned, 

 is composed of icoody plants without oil reservoirs, but some- 

 times with aromatic resinous secretions; the leaves simple and 

 stipidate; the inflorescences amentaceous and dioecious; the 

 pistil of two carpels with parietal placentce; and the fruit a 

 capsule ivith numerous tufted seeds. 



128. The willow order (Salicales) contains only the above 

 family. Dioecious aments of flowers withoid perianth but with 

 numerous ovules, perigynous (?) torus, and free bracts, distin- 

 guish this from the other orders. 



The formula of Salicales is given on pages 416, 417. 



129. The crowfoot series (Archichlamydeae). A general 

 view of all the orders which we have thus far studied shows 

 them to agree (with but rare exceptions) in having no coales- 

 cence among the petals. All the leaf-parts of any flower are 

 at first similarly distinct as they arise in the bud. Some- 



