. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. AMMIACEAE. Vol. II. I. Oxypolis filiformis (Walt.) Britton. Oxypolis. Fig. 3130. Oenanthe filiformis Walt. Fl. Cai. 113. 1788. Oenanthe teretifolia Muhl. Cat. 31. 1813. Tiedemannia teretifolia DC Mem. Omb. 51. pi. 12. 1829. Oxypolis filiformis Britton, Mem. Torr. Club 5 : 239. 1894. Stem hollow, 2°-6° high. Leaves reduced to linear hollow usually jointed acute
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. AMMIACEAE. Vol. II. I. Oxypolis filiformis (Walt.) Britton. Oxypolis. Fig. 3130. Oenanthe filiformis Walt. Fl. Cai. 113. 1788. Oenanthe teretifolia Muhl. Cat. 31. 1813. Tiedemannia teretifolia DC Mem. Omb. 51. pi. 12. 1829. Oxypolis filiformis Britton, Mem. Torr. Club 5 : 239. 1894. Stem hollow, 2°-6° high. Leaves reduced to linear hollow usually jointed acute phyllodia i'-i8' long; involucre of several linear-subulate bracts; umbels 2-4' broad, 6-iS-rayed'; rays slender, i'-2' long; pedicels 2"-4" long; fruit oval, 01 slightly obovate, 2"-3" long; oil-tubes large. In ponds and swamps, southern Virginia to Florida, west to Louisiana. Plants collected in Dela^ ware, referred to this species, differ in having broadly oval corky-winged fruit, an inconspicuous disk, slender conic stylopodium and smaller oil-tubes. Water-dropwort. 2. Oxypolis rigidius (L.) Raf. Cow- bane Hemlock or Water Dropwort. Fig. 3131. Sium rigidius L. Sp. PI. 251. 1753. O. rigida Raf.; Ser. Bull. Bot. 218. 1830. O. longifolius Britton, Mem. Torr. Club 5 : 239 1894. Sium longifoUum Pursh, Fl. Am. Sept. 194. 1814. Rather slender, 2°-6° high. Leaves simply pinnate, the lower often 1° long or rnore; leaflets thick, ovate-lanceolate, lanceolate-linear or oblong, entire, or remotely dentate, iV-Z long, 3"-i2" wide; umbels 2'-4' broad, 7-25- rayed; rays slender, i'-4' long; pedicels 2"-9" long; fruit oval, 2V'-z" long, li"-2" broad; oil-tubes small. In swamps, New York to Florida, Minnesota, Missouri and Louisiana. Pig-potato. 21. ' IMPERATORIA [Tourn.] L. Sp. PL 259. 1753. Tall perennial herbs, with large ternately divided or 2-pinnate leaves, sheathing petioles, and compound umbels of whit
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