188 MISSOURI BOTANICAL GARDEN 



tween apically and longitudinally dehiscent forms in the 

 Liliaceae that there is in some other families. 

 We may now pass to the Dicotyledons. 



Pittosporaceae. 



We find in Solly a (2 Australian species) of the Pitto- 

 sporaceae a form similar in structure to the section Lyco- 

 persicum of Solatium, but not showing dehiscence by pores, 

 and Cheiranthera (4 Australian species) which is an excel- 

 lent, slightly zygomorphic representative of this type. 



In the Pittosporaceae the five petals, frequently more or 

 less unguiculate, are erect and connivent or coherent in a 



tube at the base and spreading above. In only a few 

 species besides those of the genera Sollya and Cheiran- 

 thera are the petals more or less patent from near the base. 

 Another most important difference between these two 

 genera and the others of the family is the relative size and 

 proportion of the parts of the stamen. The anthers are 

 longer than the filaments in Sollya and Cheiranthera, 

 while in the other genera they are shorter than the fila- 

 ments, and, in relation to other parts of the flower, smaller 

 than in the genera considered here. These two genera are 

 aberrant forms in the family. 



Leguminosae. 



In the Leguminosae the apically dehiscent genera are, 

 with one exception, confined to the Caesalpinioideae, and 

 in this sub-family, with one exception, to the Cassieae. 



Cassia, serving as one of the types of this group, is too 

 well known to require description. (About 412 species of 

 tropical and subtropical distribution are known, extending 

 in America from Patagonia into the United States and 



n 



reaching their highest differentiation in the tropics of the 

 New World — 290 species. Australia has about 33 species, 

 tropical Africa 27, the Indian, Malayan and Oceanic Island 

 region about 34, and the Cape region 5 or 6). 



In Koompassia (represented by 2 or 3 species, gigantic 



