(«9) 



formation of the bulbil. The bulbil becomes the main axis 

 of the new plant, and does not perish, except gradually, after 

 the manner of a rhizome, into which it becomes converted. 

 In this it forms a new type of vegetative reproductive body 

 among the seed plants.* 



The Mimosaceae of the southeastern United States. 



By John K. Smaix. 



A study of the published treatments of the Family Mimo- 

 saceae, especially in connection with work on the represen- 

 tatives of that family in the southeastern United States, has 

 convinced me that they are all far too artificial and, to say the 

 least, impracticable. An examination of the genera and 

 species occurring in this region has led me to the conclusions 

 expressed in the following synopsis, f 



Family MIMOSACEAE Reichenb. Fl. Exc. 437. 1832. 



The Mimosaceae differ from the Caesalpinaceae and the 

 Papilionaceae, the other main divisions of the group Legu- 

 minosae in which the family formerly was included, chiefly 

 by their regular flowers. 



Key to the Genera. 



Stamens numerous, more than 10. 



Filaments partially united into a tube. 



Valves of the pod not separating from the continuous margin. 

 Pods with woody or thick-leathery valves. 



Leaves with 4 leaflets, or if more, few and relatively large : 

 spikes head-like: ovary stipitate ; pods contorted, with 

 thick-leathery valves. I. PiTHECOi,OBiUM. 



* See Vochting, H., Zur Physiologie der Knollengewachse. Jahrh. f. 

 Wiss. Bot. 34 : 1899. 



See Beal, W. J., Seed dispersal, p. 21, 189S, for notes on bulbils of other 

 species of Lysimachia. 



f Genera and species hitherto undescribed and new transferals of species 

 from one genus to another, are indicated by heavy face type. Professor 

 Bray, of the University of Texas, has furnished me with notes on the habitat 

 of some of the species. 



