EXOGENOUS OR DICOTYLEDONOUS PLANTS. 



453 



880. Ord. Polemoniacea) (Pokmonium Family). Herbs, with alter- 

 nate or opposite leaves, and panicled, corymbose, or clustered flow- 



ers. Calyx five-cleft. Corolla regular, with a five-lobed limb, con- 

 volute in aestivation. Stamens five, inserted on the corolla alternate 



with its lobes, often unequal. Ovary free, three-celled, with a thick 



FIG. 1017. Flowers of Folemonium. 1018. Flowers of Phlox. 1019. Corolla of the same, 

 laid open, showing the stamens unequally inserted on its tube. 1020. Pistil of the same. 

 1021. Cross-section of the capsule of Polemonium. 1022. Cross-section of a magnified seed. 

 1023. Perpendicular section of the same. 1024. Magnified embryo. 1025. Cross-section of the 

 dehiscent capsule of CoUomia. 1026,1027. Capsule of Leptodacty Ion. 



FIG. 1028. Pyxidanthera barbulata, of the Pine-barrens of New Jersey, natural size. 1029. 

 Pistil, in fruit, and calyx, enlarged. 1030. Corolla and stamens. 1031. Same, laid open. 

 1032. A separate stamen, magnified. 1033. Section of the dehiscent capsule. 1034. A seed. 



