26 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
mm. long; fruit strongly notched, 2 mm. long, about 38 mm. broad, 
with dorsal ribs prominent but obtuse. 
Type locality, ‘*in America.” 
In the Atlantic States from Massachusetts to Florida, and westward 
to Minnesota and Texas; also in southern California and extend: © 
into Mexico. 
Specimens examined: 
Massacuusetts: No Man’s Land, L. F. Ward, August 10, 1889. 
New York: Wading River, Long Island, 2. S. Miller, August 12, 1873; 
river banks near Oswego, C. S. Sheldon, August 6, 1880. 
MaryLanp: Ocean City, Canby, August, 1874. 
Inprana: Long Lake, near Lake Michigan, Umbach, September 18, 1897. 
Virainta: Near Ocean View Hotel, Coville 30, June 22, 1890. 
NortnH Caro.ina:. Ponds and ditches near Wrightsville, Biltmore Herb. 4005, 
July 1, 1897. 
Fiorrpa: Near Jacksonville, Curtiss 991, 4834, 4692, 5676; near Apalachicola, 
Biltmore Herb. 4005b, May, 1887; near Eustis, Lake County, Nash 351, April 
1-15, 1894; Tampa, C. L. Pollard, March 7, 1898. 
MississipPi: Petit Bois Island, Biloxi, and Ship Island, Tracy, May, 1898. 
Cairornia: Near San Bernardino, Parish Bros, 920, May, 1882; near Colton, 
Jones 3192, April 28, 1882; same station, Dunn, July, 1888; Big Morongo, 
eastern base of San Bernardino Mountains, S. B. Parish 3192, June 15, 
1894; near San Jacinto, Leiberg 3103, March 8, 1898. 
We have excluded numerous forms, including many proliferous ones, which have 
been included under this species. 
2. Hydrocotyle prolifera Kellogg, Bot. Calif. 1: 254. 1876. 
Tuberous as in //. umbellata; umbels proliferous, with 3 to 5 whorls, 
each containing 5 to 20 flowers; pedicels 2 to 6 mm. long; fruit 
slightly notched, 2 mm. long, somewhat broader, with dorsal ribs 
prominent and more obtuse than in //. wimbellata. 
Type locality, marshes ‘‘about San Francisco;” collected by Aellogg 
in 1854; type in Herb. Calif. Acad. 
In the region about San Francisco, Cal., and said to occur in Texas 
and Mexico; possibly also represented in Arizona by the form referred 
to below. 
Specimens examined: 
CALIFORNIA: Mission Bridge, San Francisco, Kellogg; San Francisco, G. R. Vasey 
221, July, 1880; Elk Grove, Lower Sacramento, Drew, in 1888; San Fran- 
cisco, Brandegee, July, 1891; Bouldin Island, San Joaquin River, Brandegee, 
September 7, 1892. 
Numerous Californian specimens have been referred to this species, which seem to 
belong more properly either to H. wmbellata or H. cuneata. Specimens from wet land 
on the shore of Silver Lake, near Tucson, Ariz. (Pringle in 1881 and Dewey in 1891), 
seem to represent a form of this species, in which the axis of inflorescence is elon- 
gated, the whorls being distant and few-flowered, and the pedicels are longer than 
we have seen in Californian specimens. We have not been able to confirm the state- 
ment that the species occurs in Texas and Mexico. 
3. Hydrocotyle canbyi C. & R. Bot. Gaz. 12: 103. 1887. 
H, umbellata ambigua Gray, Man. ed. 5. 190. 1867, not H. ambigua Pursh. 
HM. ambigua B.S. P. Prel. Cat. N.Y. 21, 1888, 
