u 



ARTIFICIAL KEY* TO THE NATURAL ORDERS. 

 (Extracted from Lindley's Vegetable Kingdom.) 



A. DICOTYLEDONS OR EXOGENS. 

 I. Angiosperms. 

 Polppfifalous, , e. mth several or man;/ free petals. 

 t Polyandrous. Stamens wore than 20. 

 Ovary inferior or partially so. 



Learea furnished with stipules. 



X Carpels more or less distinct (at least as to the stylos), or soli- 

 tary, Rosaceae (Pomaceae). 

 y. X Carpels wholly combined into a solid pistil, with more placentas 



than one. 



Placentas central. Leaves opposite,, . . . Ehizophoraceae. 



Placentas parietal, Samydaceae. 



00 Leaves without stipules. 



X Carpels more or less distinct (at least as to the styles), usually 



numerous on a torus, quite inferior Anonaceue. 



X X Carpels wholly combined into a solid pistil. 



Placentas spread over the surface of tlie dissepiments, Nymphneaceae. 



Placentas parietal. Petals indefinite in number, confused with the calyx, Cactaceae. 



Placentas in the axis. 



Leaves marked with little transparent dots. Ovary with more than one cell ; cotyledons 



distinct Myrtaceae. 



Leaves dotless. Petals definite in number, imbricate in bud, round and concave, 



style 1 Myrtaceae. (Barriugtonieae) . 



As former, but petals narrow and strap-shaped, valvate iu bud, Cornaceae (Alangieae). 



I Ovary wholly superior. 



Leaves furnished with stipules. 



X Carpels more or less distinct (at least as to the styles), or solitary. 

 II Stamens hypogynous. 



Carpel solitary, , , Legitminosae. 



Carpels several, , Magnoliaceae. 



II II Stamens perigynous. 



Styles from the apex of the solitary or several carpels, Rosaeeae. 



Styles from the base of the carpels, Chrysobalaneae. 



X X Carpels wholly combined into a solid pistil, with more placentas 

 than one. 

 II Placentas parietal. 



Leaves marked with round transparent dots, Bixaceae( Flacourtieae) . 



Leaves marked with round and linear dots intermixed, Samydaceae. 



II II Placentas in the axis. 



t Calyx imbricated in the bud. 



* Flowers unisexual, Etiphorhiaceae. 



* * Flowers hermaphrodite. 



Ovary 1-celled, sepals 2, Porlulacaceae. 



t t Calyx valvate in bud. 



* Stamens monadelphous. 



Anthers 2-celled, . Sterculiaceae. 



Anthers 1-celled Malvaceae. 



* * Stamens free, anthers 2-celled. 



Corolla twisted in bud ; calyx usually enlarged in fruit Dipterocarpeae. 



Corolla valvate in bud, < Tiliaceae. 



Leaves without stipules. 



X Carpels more or less distinct (at least as to the styles), or solitary. 



II Carpels immersed in a fleshy table-shaped disk ; waterplants Nelumbiaceae. 



II II Carpels not immersed in a disk, 

 t Stamens perigynous. 



Carpel solitary or more than one Rosaeeae. 



t t Stamens hypogynous. 



* Embryo miuute. 



* The characters of the principal dirisions are the same as in the preceding conspectus of natural orders 

 according to natural arrangement. 



1 



