CLASSIFICATION OF ANGIOSPERMS. 299 



A yellow coloring principle is found in the dyer's broom 

 (Genista tinctoria) of Europe and Asia and naturalized in the 

 New England States. G. ovata of Europe yields a similar dye. 



Copal Resins are derived from a number of the Leguminosae : 

 American copal from Hymciicca Coubaril of the West Indies and 

 South America ; Brazilian copal from H. Martiana of Rio Negro ; 

 Zanzibar or Chakazzi-copal from Trachylobmm mozamhicensis of 

 Western Africa; Sierra Leone copal (yellow gum, red gum) from 

 Copaiba Guibourtia of Sierra Leone; Inhambane copal from Co- 

 paiba conjngata and C. Gorskiana of Singapore, Jamaica and 

 Australia. 



Probably the majority of the loco- weeds or plants containing 

 principles poisonous to cattle belong to the Leguminosse, and of 

 these the following may be mentioned : California -loco-weed 

 (Astragalus crotalarico) , Texas or woolly loco-weed (A. molUs- 

 simiis), rattle-box (Crotalaria sagittalis) found in the Eastern 

 United States and Canada. The poisonous action of these plants 

 is apparently due in some cases to the presence of barium salts. 

 Clitoria glycinoidcs of Brazil, Phaca ochrolcucaca of Chile and 

 Oxytropis Lambertii of Mexico are poisonous to horses and 

 should probably be included with the loco-weeds. 



A large number of the plants belonging to the Leguminosae 

 contain toxic principles and those which have not already been 

 considered might be grouped according to the principles which 

 they contain. 



1. Arrow-poison group, including the genera JLrythro- 

 phloeum, Afzelia and Pithecolobium. 



2. FiSH-POisoN group, including the genera Albizzia. Afzelia, 

 Bauhinia, Barbiera, Enterolobium, Leucaena, Millettia. Tephrosia, 

 Acacia, Abrus, Clitoria, Mundulea, Derris, Lonchocarpus, Pisci- 

 dia (P. Erythrina or Jamaica dogwood, which contains a curare- 

 like alkaloid). 



3. SAPONiN-containing plants, as the genera Acacia, Albizzia, 

 Entada (E. scandens or the sea bean of the East and West Indies), 

 Enterolobium, Gleditschia and Gymnocladus (G. dioica or Ken- 

 tucky cofifee-tree growing in the United States and Canada). 



4. CvTisiNE-containing plants ; the alkaloid cytisine is found in 

 Laburnum vulgare and L. alpinum growing wild in Southern 



