664 



BOTANY 



POISONOUS. The seeds of many Rosaceae contain amygdalin, but usually not 

 in such amount as to be poisonous, owing to the resulting hydrocyanic acid, when 

 eaten fresh in small quantity ; this is, however, often the case with the residuum 

 left after the seeds, e.g. of bitter almonds, have been crushed. The leaves of the 

 Cherry Laurel (Prunus laurocerasus] may also give rise to toxic effects. 



OFFICIAL. ROSAE GALLICAE PETALA from cultivated plants of Rosa gallica ; 

 OLEUM ROSAE and AQUA ROSAE from Rosa damascena. AMYGDALA DULCIS and 

 AMYGDALA AMARA from Prunus amygdalus. PRUNUM from Prunus domestieus. 



PRUNI VIRGINIANAE CORTEX from Prunus sero- 



A J? 



tina. LAUROCERASI FOLIA from Prunus lauro- 

 cerasus. Cusso from Hagenia abyssinica. 

 QUILLAIAE CORTEX from Quillaja Saponaria. 



Order 19. Leguminosae 



The common characteristic of all 

 Leguminosae is afforded by the pistil. 

 This is always formed of a single carpel, 



FIG. 698. Floral diagrams of Mimo- * 



saceae. A , Mimosa pudica. B, Acacia the ventral suture of which is directed 

 iophantha. (After BICHLER.) to the dorsal side of the flower (Figs. 



698, 701, 706). It is unilocular, and 



bears the ovules in one or two rows on the ventral suture. The fruit 

 is usually a pod (legume), which dehisces by splitting along both the 

 ventral and dorsal sutures (Fig. 711). Nearly all Leguminosae have 



FIG. 699. Acacia nicoyensis. From Costa Rica. /, Leaf and part of stem ; S, hollow thorns in 

 which the ants live ; F, food bodies at the apices of the lower pinnules ; N, nectary on the 

 petiole. (Reduced.) II, Single pinnule with food-body, F. (After F. NOLL. Somewhat 

 enlarged.) 



alternate, compound, stipulate leaves. Many are provided with 

 pulvini (Figs. 132, 290, 291), which effect variation movements of the 

 leaves and leaflets. 



Family 1. Mimosaeeae. Trees, and erect, or climbing, shrubby 

 plants with bipinnate leaves. Flowers actinomorphic, pentamerous or 



