. 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 102nd meridian. Botany. AMMIACEAE. Vol. IL I. Oxypolis filiformis (Walt.) Britton. Oxypolis. Fig. 3130. Oenanihe filiformis Walt. Fl. Cai 113. 1788. Oeiiaiithe lerelifolia Muhl. Cat. 31. 1813. Tiedemannia ierelifolia DC Mem. Omb. 51. p/./.'. 1829. Oxypolis filiformis Britton, Mem. Torr. Club 5 : 239. 1894. Stem hollow, 2°-6° high. Leaves reduced to linear hollow usually jointed acute phyllod
. 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 102nd meridian. Botany. AMMIACEAE. Vol. IL I. Oxypolis filiformis (Walt.) Britton. Oxypolis. Fig. 3130. Oenanihe filiformis Walt. Fl. Cai 113. 1788. Oeiiaiithe lerelifolia Muhl. Cat. 31. 1813. Tiedemannia ierelifolia DC Mem. Omb. 51. p/./.'. 1829. Oxypolis filiformis Britton, Mem. Torr. Club 5 : 239. 1894. Stem hollow, 2°-6° high. Leaves reduced to linear hollow usually jointed acute phyllodia l'-l8' long; involucre of several linear-subulate bracts; umbels 2-4' broad, 6-15-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 ( Raf. Cow- bane Hemlock or Water Dropwort. Slum rigidius L. Sp. PI. 251. 1753. O. rigida Raf.: Sen Bull. Bot. 218. 1830. 0. longifolius Britton, Mem. Torr. Club 5 : 239 1894. Slum longifolium Pursh, Fl. Am. Sept. 194. 1814. Rather slender, 2°-6° high. Leaves simply pinnate, the lower often 1° long or more; leaflets thick, ovate-lanceolate, lanceolate-iincar^ or oblong, entire, or remotely dentate, ii'-3 long, 3"-i2" wide; umbels 2'-4' broad, 7-25- rayed; rays slender, i'-4' long; pedicels 2"-g" long; fruit oval, 2i"-i" long, ii"-2" broad; oil-tubes small. In swamps. New York to Florida. Minnesota, Missouri and Louisiana. Pig-potato. 21. IMPERATORIA [Tourn.] L. Sp. PI. 259. 1753. Tall perennial herbs, with large ternately divided or 2-pinnate leaves, sheathing petioles, and compound umbels of white fl
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