PIPER—FLORA OF THE STATE OF WASHINGTON, 329 
Flowers dark purple; re- 
ceptacle spongy. .-..-.- - CoMARUM (p. 341). 
Flowers yellow; receptacle 
dry. 
Plant — stoloniferous; 
flowers solitary... - ARGENTINA (p. 341), 
Plant not  stolonifer- 
ous; flowers cymose. DrYMOCALLIS (p. 342). 
Styles persistent, terminal, mostly plumose or geni- 
culate. 
Calyx lobes and petals 8 or 9............... Dryas (p. 343). 
Calyx lobes and petals 5. 
Styles jointed, the upper part deciduous... GruM (p. 343). 
Styles not jointed, plumose or naked.... SrEvERsIA (p. 344). 
Shrubs or trees. 
Styles very long and plumose in fruit; petals none. Cercocarpus (p. 345) 
Styles short, naked; petals yellow. ...-. 2... -.- Kunzia (p. 345). 
OPULASTER. NINeEBARK. 
Carpels pubescent, not exceeding the calyx....... 2... 22-2-.-.-2----- 1. O. pauciflorus. 
Capsules glabrous, much exceeding the calyx..............-2--------- 2. O. opulifolius. 
1. Opulaster pauciflorus (Torr. & Gr.) Heller, Bull. Torr. Club 25: 581. 1898. 
Spiraea opulifolia pauciflora Torr. & Gr. FJ. 1: 414. 1840. 
Neillia malvacea Greene, Pittonia 2: 30. 1889. 
Opulaster malvaceus Greene, Erythea 2: 194. 1895. 
Physocarpus pauciflorus Piper, Fl. Palouse Reg. 94. 1901. 
Type Locauity: Blue Mountains, Oregon. Collected by Nuttall. 
Rance: British Columbia‘to Utah and Montana. 
SPECIMENS EXAMINED: Fort Colville, Lyal/ in 1861; Spokane, Piper 2693; Rock Lake, 
Sandberg & Leiberg 102; Kamiak Butte, Piper 3088, 3557; Elmer 808; Blue Mountains, 
Piper, July 16, 1896; Clarks Springs, Areager 35: Spokane, Kreager 625. 
ZONAL DISTRIBUTION: Arid Transition. 
2. Opulaster opulifolius (L.) Kuntze, Rev. Gen. Pl. 2: 989. 1891. 
Spiraea opulifolia L. Sp. Pl. 1: 489. 1753. 
Neillia opulifolia Benth. & Hook.; Brewer & Wats. Bot. Cal. 1: 171. 1876. 
Physocarpa opulifolia Raf. New Fl. 3:73. 1836. 
Spiraea capitata Pursh, Fl. 1: 342. 1814. 
Type Lcocauiry: “In Virginia, Canada.” 
Rance: Canada to Georgia and Kentucky; British Columbia to Oregon and Idaho. 
SPECIMENS EXAMINED: Clallam County, E/mer 2520; Cascade Mountains, latitude 49°, 
Lyall in 1859; Coupeville, Gardner 99; Seattle, Piper in 1885; Montesano, Heller 3858; 
Olympia, Kincaid, July 4, 1896; Chehalis County, Lamb 1154; Silverton, Bouck 46; Manor, 
Piper 3074; Roslyn, Whited 459; Klickitat River, Flett 1330; Blue Mountains, Piper, July, 
1896. 
ZONAL DISTRIBUTION: Transition. 
LUTKEA. 
1. Lutkea pectinata (Pursh) Kuntze, Rev. Gen, Pl. 1: 217. 1891. 
Lutkea sibbaldioides Bong. Mem. Acad. St. Petersb. VI. 2: 130. 1833. 
Saxifraga pectinata Pursh, Fl. 1: 312. 1814. 
Eriogynia pectinata Hook. FI. Bor, Am. 1: 255. pl. 88. 1834. 
Type Locaity: ‘‘ Northwest coast.’’ Collected by Menzies. 
Rance: Alaska to Mount Shasta and the Blue Mountains. 
