506 



MANUAL OF POISONOUS PLANTS 



poisonously by dissolving the blood corpuscles. Clwlesterin contained in the 

 body acts as a natural antidote against them. 



Several plants of the order produce members of the terpene group ; rose oil, 

 contains rhodinol C^^H^gO, supposed to be identical vi^ith geranium oil; and a 

 second terpene, roseol, Cj^H^qO,. Many fruits of the order, especially Pomeae, 

 contain inannite and sorbite. The arbutin, Cj2H^gO^ obtained in many plants 

 also occurs in some plants of this order; the glucoside hydrochinon, C.Hj^O,^ 

 occurs in the buds of pears. Quercetrin Cjj.H^pO^, derived from a glucoside, 

 is found in the flowers of haw (Crataegus), the bark of apple trees and of 

 Prunus instiiitia. Amygdalin C^^Hg-NOj^, occurs in the seeds of many plants 

 of the family, especially in Pomeae and Pruneae; also in the bark of Prunus 

 Padus, P. serotina, etc., and in the seeds of Pyrus Ancuparia. 



Fig. 266. Kooso (Brayera anthelmintica). Flowering branch. Contains a muscle poison. 

 (After Faguet). Fig. 266a. Common Wild Plum {Prunus amcricana). (C. M. King). 



Genera of Rosaccae 



Ovary inferior or enclosed in the calyx tul)c. 



Carpels numerous ; fruit an achenc 3. Rosa. 



Carpels few, fruit not an achcne. 



Carpels cartilaginous ; fruit a pome 4. Pyrus. 



Carpels bony, drupe-like 6. Crataegus. 



Ovary superior not enclosed in calyx tube. 



Calyx deciduous ; fruit a drupe 5. Prunus. 



