PAPILIONACEOUS FLOWERS 



139 



223. 



Cassia flower, 



showing the 



separate 



keel petals. 



pea shape are said to be papil- 

 ionaceous (Latin papilio, a but- 

 terfly). 



277. Flowers of the pea and 

 its kind have a pecu- 

 liar arrangement of 

 stamens. The sta- 

 mens are 10, of which 

 9 are united into a 

 tube which incloses 

 the pistil. The tenth 

 stamen lies on the upper edge 

 of the pistil. The remains of 

 these stamens are seen in Fig. 

 190. The stamens are said to 

 be diadelphous ( " in two brother- 

 hoods") when united into two 

 groups. Stamens in one group 

 w o u 1 d 

 be called 



monadelphous, and this arrange- 



nient occurs in some members of 



the Leguminosa^ or pea family. 



278. MALLOW FLOWERS. — The 



flowers of the mallow family are 



well represented in single holly- 

 hocks (Figs. 20G, 207) and in the 



little plant (Fig. 224) known as 



" cheeses." The peculiar structure 



is the column formed by the united 



filaments, the inclosed styles, and 



the ring of ovaries at the bottom 



of the style -tube. The flower is 224. comraon maiiow, a tr 



5-merous. Count the ovaries. ?ruul'rii:es'u,:'na:nes' 



They sit on the torus, but are ;eheeses"an.l" shirt button 



222. Papilionaceous flowers 

 Sweet pea. 



