124 Rhodora [June 



Harmon Pond, New Marlboro, June 29, 1912, R. Hoffmann (N); 

 quiet water, Lake Garfield, Monterey, July 12, 1912, R. Hoffmann (N). 

 Rhode Island: Smithfield, May, 1845, G. Thurber (H); pond in a 

 quarry, Lime Rock, Lincoln, Oct. 19, 1913, H. St. John, no. 900 (N). 

 Connecticut: shallow water, Dog Pond, Goshen, Aug. 24, 1913, 

 C. H. Bissell & C. A. Weatherby (N); in Pistapaug Pond, Durham, 

 Sept. 9, 1913, A. E. Blewitt, no. 1,681 (N); Hamlin's Pond, Southing- 

 ton, July 29, 1901, C. II. Bissell (H); ex Park River, Hartford, mense 

 Junio florentem, 1845, J. W. Bobbins (H); Lake Saltonstall, New 

 Haven, 1857, D. C. Eaton (H). New England: E. Tuckerman (H). 

 New Jersey: Budd's Lake, Morris County, Aug. 6, 1869, T. C. 

 Porter (H); Morris Pond, July 20, 1907, C. S. Williamson (A); Swartz- 

 wood Lake, Aug. 31, 1904, C. S. Williamson (A no. 511,111). Penn- 

 sylvania: above the forks of Neshaminy Creek, Bucks County, 

 Dr. Martindale (A); in Lehigh River, Bethlehem, Schweinitz (A); 

 Susquehanna River, Harrisburg, Aug. 26, 1863, T. C. Porter (A & H); 

 Susquehanna below Columbia, Lancaster County, Aug. 31, 1863, 

 T. C. Porter (H). Delaware: canal, Delaware City, Sept. 7, 1896, 

 A. Commons, no. 18 (A &H). Ontario: Ottawa River near Brittania, 

 Aug. 21, 1911 (C. no. 85,540); Plevna, July 29, 1902, J. Fowler (H); 

 Cockburn Island, Lake Huron, T. Bell (H). Indiana: Wolf Lake, 

 Sept. 3, 1900, Agnes Chase, no. 1,463 (A). Wyoming: Heart Lake, 

 Yellowstone Park, Hayden Expedition, 1878, C. Richardson (H). 

 Idaho: south end of Lake Coeur d'Alene, July 17, 1898, L. F. Hender- 

 son, no. 4,613 (H). Oregon: Strawberry Lake, 2,330 m. altitude, 

 Blue Mountains, Sept. 8, 1910, Wm. C. Cusick, no. 3,022 (H); without 

 definite locality, 1871, Elihu Hall, no. 495 (H). Washington: 

 abundant in shallow water, Lake Cushman, Mason County, Aug., 

 1895, C. V. Piper, no. 2,231 (H); under two feet of water, Lake 

 Cushman, July 6, 1890, L. F. Henderson, no. 1,861 (H). British 

 Columbia: Sumas River, Vancouver Island, Aug. 13, 1887, John 

 Macoun (C no. 4,154); Dick's Lake, Sooke, Vancouver Island, Aug. 2, 

 1893, John Macoun (C no. 4,369). 



2. P. pectinatus L., Sp. PI. 127 (1753). 1 P. interruptus Kit. in 

 Schult. Osterr. Fl. ed. 2, i. 328 (1814). P.flabellatus Bab., Man. Brit. 

 Bot. ed. 3, 343 (1851). P. columbiamis Suksdorf, Deutsche Bot. 

 Monatschr. xix. 92 (1901). — Rootstock creeping, freely branched, 

 about 1 mm. thick, bearing terminal thickened bulblets: stem filiform, 

 about 1 mm. thick, sparsely branched near the base, but towards the 

 summit closely and abundantly forking: loaves 3—15 cm. long, bristle- 

 like, mostly 0.25-1 mm. broad (those of the first year's shoot often 

 broader and blunt), tapering to an acute tip, with 1-3 nerves; sheaths 

 2-5 cm. long, only slightly thicker than the stem, the sides often 

 bleached to a chalky-white color; the ligule less than half the length of 



1 No attempt has been made to include full synonymy, which can be found especially in 

 Ascherson & Graebner, I. c. Only such names as have been open to question in America and 

 which now seem satisfactorily disposed of are given as synonyms. 



