86 BERBERI DACEjE. 



spring, a tuft of two-parted peltately-veined radical leaves, 

 on long petioles, and naked scapes terminated by a single 

 white flower. 



Etymology. Dedicated by Professor Barton to Thomas Jefferson. 



Properties. The plant has a popular reputation in Ohio, under the 

 name of Rheumatism-root, as a stimulant, diaphoretic, &e. (Riddell, Synop- 

 sis.) The seeds have an acrid taste, which is very persistent. 



Geographical Distribution. The single species inhabits rich and cool 

 woods, from Northern New York southward through the Alleghany Moun- 

 tains, and in the Western States. 



PLATE 34. Jeffersonia diphylla, Pers. ; — natural size in flower. 

 (Botanic Garden, Cambridge.) 



1. Diagram of the flower. 



2. A stamen, magnified. 



3. A stamen, more enlarged ; the valves of the anther opening. 



4. Same ; the anther divided transversely before dehiscence ; then 4-celled. 



5. Pistil, magnified ; dorsal view. 



6. Same, seen from the inner or placental side. 



7. Same, transversely divided, showing the 4-ranked ovules. 



8. An ovule, more magnified. 



9. A growing seed, with the arillus just appearing ; enlarged. 



10. The mature, dehiscent pod ; natural size. 



11. Same, with the seeds removed, and the back cut away to show the 



placenta. 



12. A seed, with its arillus, magnified. 



ID. Vertical section of the same, showing the minute embryo at the base 

 of the albumen. 



