REVISION OF RDMEX. 81 



examined from California (Bigelow, 1854; Egloffstein, 

 1854; Brewer, 1863, 405; Bolander & Kellogg, 1866; 

 Vasey, 1880, 547, and 1881; Mrs. Bush, 1880; Pringle, 

 1882; Parish, 1882 & 1884, 678, 1888 ; Brandegee, 1886; 

 Basse, 1888), Lower California (Palmer, 1889, 689, 829), 

 Arizona (Palmer, 1867, 224; Lemmon, 1881, 281), Utah 

 (Mrs. Thompson, 1872; Parry, 1874, 246; Palmer, 1877, 

 422; Jowes, 1880, 1643), New Mexico (Fendler, 1847, 758; 

 Wright, 1852, 1782; Bandelier, 1882; Matthews, 1883), 

 Indian Territory (Palmer, 1868, 291), and Texas (Thur- 

 ber, 1855, 140; Reverchon, 1882, 129). Plate 18. 



H- -i- Valves small or medium sized (not over 10 mm.long), only mod- 

 erately if at all cordate. 



M- Valves round or very broadly ovate, flexible, low -reticulate : pedi- 

 cels slender or capillary : stems glabrous except in E. crispus. 



7. R. OCCIDENTALS, S. Wats. Mostly two or three feet 

 high, erect or abruptly ascending, rather stout, subsiraple ; 

 leaves somewhat fleshy, glabrous, glossy, bluish green, wavy 

 margined, the lower ample or very large, ovate or mostly 

 oblong-ovate, truncately cordate, the apex rounded to sub- 

 acute ; panicle strict, dense and rosy in fruit, naked or with 

 few small leaves below; whorls somewhat remote but over- 

 lapping; pedicels 2 to 3 times as long as the fruit, very 

 obscurely and not tumidly jointed below the middle ; valves 

 sometimes rosy, 5 to 6 mm. long (exceptionally 7x9 mm.) 

 deltoid-ovate, often only slightly cordate, remotely erose or 

 denticulate, rounded or obtuse at apex, without callosities 

 (but one midrib occasionally somewhat thickened) ; achene 

 2 to 2.5x4 mm. Proc. Amer. Acad. xii. (1876), 253. R. 

 longifolius, Meisner, DC. Prod. xiv. 44, as to the American 

 plant and its synonyms. Damp or rich soil, Labrador to 

 Alaska, south to Canada, California, and in the mountains 

 to Texas. Specimens examined from Labrador (Siorer; 

 Allen, 1882, 64), Hudson's Bay (Bell, 1884), Arctic 

 America (Richardson on. Franklin Exp .), Canada (Allen, 

 1881; Macoun, 1883), Saskatchewan (Bourgeau, 1858) and 



