COULTER AND ROSE—NORTH AMERICAN UMBELLIFERAE. 193 
Smooth erect swamp herbs, with fascicled tubers, leaves simply pin- 
nate or ternate or reduced to petioles, involucre of few bracts or none, 
involucels of numerous small bractlets or none, and white flowers. 
First species cited by Rafinesque, Siw rigidius L, Sp. Pl. 1: 251, 
1753. 
A genus of 5 species, belonging to North America. 
Leaves reduced to cylindrical jointed petioles. ..-....-------------- 1. O27 filiformis. 
Leaves either ternate or pinnate. 
Leaves ternate; leaflets entire. ........--------------------------- 2. O, ternata, 
Leaves pinnate; leaflets mostly toothed. 
Leaflets entire or sharply-toothed; lateral wings broad; eastern.. 3. Q. rigidior, 
Leaflets from serrate to crenate-toothed; lateral wings narrow; western. 
Leaflets 5 to 9; rays unequal; Rocky Mountains -.-.--.------- 4. OJ fendleri. 
Leaflets 9 to 13; rays equal or nearly so; Oregon..--.------ 5. O. occidentalis. 
1. Oxypolis filiformis (Walt.) Britton, Mem. Torr. Club 5: 239, 1894. 
Ocenanthe filiformis Walt. Fl. Car, 118. 1788, 
Oenanthe teretifolia Muhl. Cat. 31. 1815. 
Tiedemannia teretifolia DC, Coll. Mém. 5: 81, pl. 12. 1829. 
Peucedanum teretifolium Wood, Bot. & Flor, 136. 1870. 
Stem 6 to 18 dm. high, fistulous; leaves reduced to cylindrical 
hollow pointed petioles (jointed by transverse partitions); umbel 6 to 
12-rayed, with involucre and involucels of few or many subulate 
bracts; rays 1 to 4 cm. long; pedicels 4 to 6 mm. long; fruit some- 
what obovate, + to 5 mm. long, truncate or rounded at base and rounded 
at apex, and with wings thinner than the body; disk prominent, with 
a short conical stylopodium; oil tubes large, filling the intervals, 2 to 
4 on the commissural side. 
Type locality not given, but presumably in the Carolinas. 
Ponds and swamps, from southern Virginia to Florida and west to 
Louisiana. 
Specimens examined: ° 
Fiormpa: Apalachicola, Chapman; Biscayne Bay, Palmer, in 1874; Jacksonville, 
Curtiss, in 1875, 1893, and 1894; southern Florida, Garber, April, 1877; Simp- 
son, in 1889; Baldwin, Duval County, Nash 2596, September 6, 1895. 
Mississippi: Ocean Springs, Jackson County, Skehan, June 24, 1895; same station, 
Pollard 1015, July 25, 1896. 
Oxypolis filiformis canbyi C. & R., var. nov. 
Fruit orbicular or short oblong, retuse at base and apex, with thick 
corky lateral wings (leaving the body depressed), an inconspicuous 
disk with a slender conical stylopodium, and smaller oil tubes not fill- 
ing the intervals. 
Type locality, moist upland meadows, Ellendale, Del. ; collected by 
Canby, August, 1867; type in U.S. Nat. Herb. 
Only known from the type locality, our specimens being from col- 
lections made by Candy in L867, 1874,and 1891; and by Commons in 
1877. 
