xxiv Introduction. 



t Leaves alternate, stipulate. 



* Carpels more or less united, often forming a fleshy fruit. 



Trees and shrubs having white, pink, or scarlet flowers, 



Rosacece, tribe Pome, page 171 

 ft Leaves exstipulate. 



Placentas spread over the dissepiments. 



Water-plants with showy flowers and orbicular floating 



leaves Nympheeacece, p. 34 



Placentas parietal. 



Petals definite in number, distinct from the calyx. Climb- 

 ing or trailing herbs with hispid, often pungent hairs, 



Loasea, p. 203 

 Sepals and petals numerous, passing gradually from one 



into the other. Fleshy, often prickly plants. Cactece, p. 208 

 Placentas axile. 



Shrubs having opposite leaves furnished with translucent 



dots . . . . , . Myrtacece, p. 193 



Petals very numerous. Trailing herbs with fleshy leaves, 



Ficoideee, p. 208 



Petals few, strap- shaped. Trees with simple alternate 

 deciduous leaves and small capitate polygamous 



flowers Nyssa, p. 217 



Petals few, oval or oblong. Shrubs with deciduous, oppo- 

 site leaves, and white, fragrant flowers PJiiladelpJius, p. 185 

 Ovary wholly superior. 

 f Leaves stipulate. 



* Carpels more or less distinct (at least when young), or 



solitary. 

 Stamens hypogynous. 



Carpels numerous. Trees or shrubs having alternate 

 stipulate leaves and usually showy fragrant flowers, 



Magnoliacea, p 23 

 Stamens perigynous. 



Carpel one .... Rosacea tribe Prunece, p. 140 

 Carpel more than one .... Rosacece, p. 142-170 

 ** Carpels wholly combined into a solid pistil, with more pla- 

 centas than one. 



Calyx with an imbricated aestivation. 

 Placentas parietal. 



Shrubs with alternate or opposite leaves and showy 



fugacious flowers having crumpled petals Cistinea, p. 55 

 Placentas axile. 



Trailing herbs with succulent leaves and showy flowers 

 having a calyx of two sepals united at the base, 



Portulacecs, p. 74 

 Calyx with a valvate aestivation. 

 Stamens monadelphous. 

 Anthers 2-celled. Deciduous shrub with petaloid yellow 



sepals Fremontia, p. 84 



Anthers 1 -celled. Herbs OP shrubs having showy 

 flowers. Petals usually oblique and twisted in 

 aestivation . , . . . . Malvacea-, p. 79 



