COULTER AND ROSE—NORTH AMERICAN UMBELLIFERAE. 27 
Umbels 3 to 9-flowered, generally proliferous; pedicels very short. 
but distinct; fruit slightly notched, 2 mm. long and about 4 mm. broad, 
much more flattened than in the preceding forms; dorsal and lateral 
ribs much more prominent, the former acutish. 
Type locality, ‘‘ Maryland ;” type in Herb. Gray. 
New Jersey to Maryland. 
Specimens examined : 
DeLawareE: Collins Beach, Commons, July 6, 1874. 
MARYLAND: Ocean City, Canby, August, 1874. 
4. Hydrocotyle bonariensis Lam. Encycl. 3: 153, 1789, 
HT, bonariensis terana C. & R. Bot. Gaz. 15: 259. 1890. 
Umbels profusely branching and proliferous; pedicels slender, more 
or less elongated, sometimes 2 cm. long; fruit slightly notched, 2 mm. 
long, 8 mm. broad. 
Type locality, ‘* pres de Buenos-Ayres.” 
From North Carolina to Florida and Texas; a South American and 
Mexican species, and often a ballast plant. 
Specimens examined: 
Nortu Carouina: Ballast dumps at Wilmington, Biltmore Herb. 5708, July 2, 
1897, 
FLorma: Dry grassy ground, Pensacola, Curtiss 5922, July 3, 1897. 
MississipPt: Biloxi, Harrison County, Pollard 1153, August 1, 1896. 
Texas: Lindheimer, October, 1847 (under H. umbellata); Devils River, Havard 
139, July, 1883; Nealley, in 1888; Industry, Wurzlow, in 1895. 
Most of the so-called proliferous forms of H. umbellata throughout the South and 
Southwest and on ballast heaps seem to belong to H. bonariensis. 
5. Hydrocotyle verticillata Thunberg, Diss. 2: 415. pl. 3. 1800. 
fT, interrupta Muhil. Cat. 29. 1813. 
Umbels few-flowered, proliferous, forming an interrupted spike; 
pedicels very short or none; fruit 2 mm. long, 3 mm. broad, truncate 
or rounded at base, with dorsal and lateral ribs very prominent, the 
former acute. 
Type locality unknown. 
From Massachusetts to Florida, west to central Texas and Arkansas, 
Specimens examined: 
New Jersey: Cape May, Canby, July, 1866. 
ViraintA: Hampton, Steele, August, 1895. 
Nortu Carouina: Near Clarkton, Biltmore Herb, 2542a, June 25, 1897. 
Soutn Carouina: Near Aiken, Ravenel. 
Fiorma: Hibernia, Canby, March, 1869; St. Johns River above Palatka, Cur- 
tiss 992; Otto Vesterlund, in 1889; near Jacksonville, Curtiss 4333, 4963, May 
30, 1893, and June 29, 1894; Palm Beach, Canby, March 29, 1895; Lake 
City, Columbia County, Nash 2485, August 29-31, 1895, 
Mississippi: Biloxi, Tracy 4471, May 26, 1898. 
Texas: Hempstead, Hall 239, May 28, 1872; Houston, L. F. Ward, September 
12, 1877; Gillespie County, Jermy; Dove Creek, Tom Green County, Tweedy 
190, May, 1880; Concho, Havard, June, 1881. 
ARKANSAS: Spirit Lake, Lafayette County, A. A.& FE. Gertrude Heller 4113, August 
18, 1898. 
