442 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Piper, C. V. Bull. Torr. Club 29: 223, 224. 1902. Two varieties. 
Piper, C. V. Contr. Nat. Herb. 11: 423. 1906. One species. 
Ross, J. N. Proc. U. S. Nat. Mus. 29: 441, 442. 1905. One species. 
Rosg, J. N. Proce. Biol. Soc. Wash. 19: 96. 1906. One species. 
Ryppera, P. A. Mem. N. Y. Bot. Gard. 1: 284-293. 1900. Two species. 
RypperG, P. A. Bull. Torr. Club 31: 573-575. 1904. Four species. 
RypperG, P. A. Bull. Torr. Club 33: 147. 1906. Three species. 
Smai, J. K. Fl Southeast. U. S. 856-876. 1903. Three species. 
Suxsporr, W. N. Allg. Bot. Zeitsch. 12: 5, 6. 1906. Two species. 
GENERA AND SPECIES. 
HYDROCOTYLE L. Sp. Pl. 234. 1753. 
Hydrocotyle rotundifolia Roxb. Hort. Beng. 21. 1814. 
This species is native of Tropical Asia and Africa. It is grown in many places as 
a carpet plant under the name of Sibthorpia europea and is now an escape in a few 
places in this country. It was observed a number of years ago by J. N. Rose in 
Washington, where it now appears every year in the grounds about the National 
Museum; again in lawns in West Chester, Pennsylvania, by F. Wendle; and more 
recently at Louisville, Kentucky, by H. Garman, who states that it is a pest ina 
cemetery there. For further comment see Bailey’s Cyclopedia of American Horti- 
culture. 
ERYNGIUM L. Sp. Pl. 232. 1753. 
Dr. J. K. Small has described the following species, which is closely 
related to AL diffusum: 
Eryngium compactum Small, Fi. Southeast, U. 8. 865, 1903. 
SANICULA L. Sp. Pl. 235. 1753. 
Sanicula serpentina I ]mer, Bot. Gaz, 41: 312. 1906, 
We have not seen this species, which comes from California. 
Sanicula tripartita Suksdorft, Allg. Bot. Zeit. 12:5. 1906. 
We have not seen this species, which comes from Washington. 
CHAEROPHYLLUM L. Sp. Pl. 258. 1753. 
Mr. B. F. Bush has prepared a most excellent monograph of this 
genus, which was published in the Transactions of the Academy of 
Science of St. Louis. 
His key to the species is as follows: 
ee Na * 
Leaves coarsely divided. Northern species. 
Fruit beaked, smooth; ribs narrow ......-.------------------ 1. CL procumbens. 
Fruit beakless, pubescent; ribs narrow ...--.---------------- 2. C. shortti. 
Leaves finely divided. Southern species. 
Fruit beakless, smooth; ribs broad .............-.----------- 3. C. teranum. 
Fruit beaked, pubescent; ribs broad..............----------- 4. C. dasycarpum. 
Fruit beaked, smooth. 
Ribs thicker than the intervals..........2.....-----+---- 5. C. tuinturieri. 
Ribs narrower than the intervals. 
Base of fruit broad, obtuse........-. Lee eee eee 6. C. floridanum. 
Base of fruit narrow, acute.............------------- 7. C. reflecum. 
