AN ANALYTICAL KEY TO THE NATURAL 

 FAMILIES. 



A. FLOWERING OB PILENOGAMOUS. Plants producing true flowers and 



seeds. (B, page 25.) 

 I. ANGIOSPEBMS, those plants bearing the ovules in a closed ovary ; coty- 



ledons normally 2 or I (includes all but the Pine and Cycad families). 



(II, page 24.) 

 4- DICOTYLEDONS OR EXOGENS, with wood in a circle or in concentric 



annual circles or layers around a central pith ; netted-veined leaves ; 



and parts of the flower mostly inflves or fours. Cotyledons typically 2. 



(++ page 23.) 

 O. Polypetalous Division, typically with both calyx and corolla, the latter of 



wholly separate petals. (OO, page 17. OOO, page 21.) 

 * More than 10 stamens, more than twice the number of the 



sions of the calyx. (* * page 15.) 



sepals or divi- 

 PAGE 



Stamens monadelphous, united with the base of the corolla: anthers kid- 



ney-shaped, one-celled .... MALLOW FAMILY, 85 



Stamens monadelphous at base : anthers two-celled : leaves twice 



pinnate ......... MIMOSA SUBF. 122 



Stamens monadelphous at base: anthers two-celled: leaves not pinnate 

 Leaves with joint between petiole and blade, which is translucent- 



dotted ........ (Citrus) RUE F. 98 



Leaves without a joint and not translucent-dotted CAMELLIA F. 84 

 Stamens not monadelphous 



Pistils numerous, but imbricated over each other and cohering in a 



mass on a long receptacle .... MAGNOLIA F. 45 



Pistils several, immersed in hollows in a top-shaped receptacle, 



(Nelumbo) WATER LILY F. 51 

 Pistils numerous and separate, at least their ovaries, but concealed 



in a hollow fleshy receptacle 

 Which bears sepals or bracts over its surface: leaves simple, 



opposite ...... CALYCANTHUS F. 163 



Which is naked and imitates an inferior ovary : leaves alternate, 



compound ...... (Rosa) ROSE F. 141 



Pistils numerous or more than one, separate, on the receptacle 



Stamens borne on the calyx ...... ROSE F. 141 



Stamens borne on the receptacle 



Leaves centrally peltate : aquatic herb (Brasenia), 



WATER LILY F. 51 

 Leaves peltate near the margin : woody climber, 



MOONSEED F. 48 

 Leaves not peltate, quite entire : trees or shrubs 



Spicy anise-scented: petals numerous: seed solitary, 



(Illicium) MAGNOLIA F. 45 

 Unpleasantly scented when bruised : petals 6 in 2 ranks : 



seeds several . . . CUSTARD APPLE F. 48 

 Leaves not peltate : herbs, or if woody-stemmed the leaves 



are compound . . . . . CROWFOOT F. 34 



13 



