‘COULTER AND ROSE—NORTH AMERICAN UMBELLIFERAE. 29 
Ruope Isuanp: Providence, W. W. Bailey, in 1874. 
New Jersey: Fort Lee, Van Sickle, July 12, 1894. 
District of CoLtumpta: Near Washington, Vasey, September 20, 1885; near 
Takoma, Pollard 471, July 10, 1895. 
Norra Carouina: Buncombe County, Biltmore Herb. 4003a, June 27, 1898. 
New York: Oswego County, Sheldon, August 13, 1883; near Ithaca, Coville, in 
1885 and 1886; near Ithaca, Wiegand, July 5, 1893. 
Wisconsin: Rock Creek, Vasey, in 1872; St. Croix Falls, Sheldon, September, 1893. 
9. Hydrocotyle ranunculoides L. f. Suppl. 177. 1781. 
H. natans Cyrilli, Pl. Rar. Neap. 1: 20. pl. 605, 1892. 
Floating or creeping in mud; leaves thicker, round reniform, 3 to 
7 cleft, with crenate lobes; peduncles, 2.5 to 7.5 cm. long, reflexed in 
fruit; capitate umbel 5 to 10-flowered; fruit, 2 to 3 mm. broad, with 
rather obscure ribs, and no layer of strengthening cells about the seed 
cavity; seed section oblong. 
Type locality, ‘* Mexico.” 
Eastern Pennsylvania to Florida, thence westward to Texas, Cali- 
fornia, and Washington. 
Specimens examined: 
PENNSYLVANIA: Near Wrightsville, York County, Reed, July 7, 1890. 
District or CotumBia: Near Bennings Bridge, Vasey, in 1874; between George- 
town and Chain Bridge, Vasey & Coville, July 15, 1888. 
Mary Lanp: Great Falls of the Potomac, Pollard, July 4, 1896. 
VirGinia: near Alexandria, Rose & Coville, May 24, 1890; Four Mile Run, Steele, 
July 31, 1896. 
Fiormpa: Near Apalachicola, Curtiss 5888, June 12, 1897; Chapman. 
New Mexico: Wright 1102, in 1851. 
Cauirornia: Near San Francisco, Wilkes Exped. 1460; same station, Vasey 220, July, 
1880; Lemmon 63, in 1889; Los Angeles County, Hasse, August 26, 1890; San 
Bernardino County, Par- 
ish, June 20, 1891; near 
San Jose, Jepson, May 28, 
1896; near San Francisco, 
Alice Eastwood, July, 1896. 
OreGon: Near Portland, [en- 
derson 368, in 1886. 
Wasnineton: Near Seattle, 
Piper 639, September 8, 
1889. 
2. CENTELLA L. Pl. Rar. 
Afr. 28. 1760; Amoen. 
Acad. 6: 112. 1764. 
Calyx teeth obsolete. 
Fruit orbicular to reniform, strongly flattened laterally. Carpel with 
5 primary ribs and prominent secondary ribs and reticulations, the 
dorsal marginal and filiform; an oil-bearing layer beneath the epider- 
mis, occasionally containing small oil tubes, and a thick laver of 
strengthening cells surrounding the seed cavity. 
Perennial herbs, growing in or near the water, with slender creep- 
Fic. 2.—Centella asiatica: a, x 8; b, x 10. 
