378 ILLUSTRATIONS OF THE NATURAL ORDERS. 



Group 12. Orary compound, 1 - 5-celled, with one or two ovules erect from 

 the base of the cells. Calyx free or partly adherent. Stamens as many as 

 the petals or sepals and opposite the former. Seeds anatropous, albumi- 

 nous. Woody plants, with a colorless juice. Flowers regular. Leaves 

 alternate. 



Calyx obscure. Petals valvate, caducous. Embryo minute. ViTACEiB. 



Calyx more conspicuous than the petals, valvate. RhamnacejE. 



Group 13. Ovary compound, 2-5-cellcd, with only one or two ovules in each 

 cell. Stamens as many as the petals and alternate with them, perigynous. 

 Seeds furnished with an arillus, albuminous, with a large straight embryo. 

 Woody plants, with regular flowers and simple leaves. — Represented 

 mainly by CELASTKACEiE. 



Group 14. Ovary compound and 2-3-celled, with one or two (rarely 3 or 4) 

 ovules in eacli cell, free from the calyx, which is imbricated in sestivation. 

 Flowers often irregular, and sometimes unsymmetrical. Stamens definite, 

 hypogynous or perigynous. Shrubs, trees, or herbs. Leaves opposite or 

 alternate, not punctate. 



Stamens distinct, inserted on a hypogynous or perigynous disk. 

 Embryo (except in Staphylea) variously curved or coiled, and 



destitute of albumen. SapindacEjE. 



Stamens hypogynous, without a disk. 

 Stamens mostly raonadelphous, 10. 



Flowers regular. Embryo curved ; albumen none. MaLpighiace^e. 



Stamens monadelphous or diadelphous, 6 or 8. Flower irregu- 

 lar and unsymmetrical. Embryo straight in albumen. PoLYGALACE.ffi. 



Group 15. Ovary simple and solitary, free from the calyx; the fruit a pod. 

 Flower 5-merous, the odd sepal anterior. Corolla papilionaceous, irregu- 

 lar, or sometimes regular. Stamens monadelphous, diadelphous, or dis- 

 tinct, mostly perigynous. Seeds destitute of albumen 



Stamens hypogynous, the anterior wanting. Stipules none. ItKAMEKiACE.s;. 

 Stamens mostly perigynous. Fruit a legume. Leguminos.s;. 



Group 16. Ovaries one or several, cither simple' and distinct, or combined 

 into a, compound ovary with two or more cells and the placentae in 

 the axis. Petals and the distinct stamens perigynous. Seeds destitute of 

 albumen. 



* Calyx free, although often enclosing the ovaries in its tube, except when the 



latter are united, wlien it is adnate to the compound ovary, and the sta- 

 mens are indefinite. 



Leaves alternate, stipulate. Cotyledons plane. Rosaceje. 



Leaves opposite, not stipulate, nor pellucid-punctate. Calycakthace*). 



Leaves opposite, not stipulate, pcUucid-punctate. MYRTACEyE. 



* * Calyx free from the compound ovary. Stamens definite. Lyihracejo. 



