PIPER FLORA OF THE STATE OF WASHINGTON. 329 



Flowers dark purple; re- 

 ceptacle spongy CoMARUM (p. 341). 



Flowers yellow; receptacle 

 dry. 

 Plant stolonif erous ; 



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.. Geum (p. 343). 



Styles not jointed, plumose or naked Sieversia (p. 344). 



Shrubs or trees. 



Styles very long and plumose in fruit; petals none. Cercocarpus (p. 345) 

 Styles short, naked; petals yellow Kunzia (p. 345). 



OPTJLASTER. Ninebark. 



Carpels pubescent, not exceeding the calyx 1.0. paucijlorus. 



Capsules glabrous, much exceeding the calyx 2.0. ojndifolius. 



1. Opulaster pauciflorus (Torr. & Gr.) Heller, Bull. Torr. Club 25: 581. 1898. 

 Spiraea opulifolia paucijlora Torr. & Gr. Fl. 1 : 414. 1840. 



Neillia malvacea Greene, Pittonia 2: 30. 1889. 



Opulaster malvaceus Greene, Eiythea 2: 194. 1895. 



Physocarpus pauciflorus Piper, Fl. Palouse Reg. 94. 1901. 



Type locality: Blue Mountains, Oregon. Collected by Nuttall. 



Range: British Columbia to Utah and Montana. 



Specimens examined: Fort Colville, Lyall in 1861; Spokane, Piper 2693; Rock Lake, 

 Sandberg & Leiberg 102; Kamiak Butte, Piper 3088, 3557; Elmer 808; Blue Mountains, 

 Piper, July 16, 1896; Clarks Sp:ings, Kreager 35; Spokane, Kreager 625. 



Zonal distribution: Arid Transition. 



2. Opulaster opulifolius (L.) Kuntze, Rev. Gen. PI. 2: 989. 1891. 

 Spiraea opulifolia L. Sp. PI. 1 : 489. 1753. 



NeiUia 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 locality: "In Virginia, Canada." 



Range : Canada to Georgia and Kentucky ; British Columbia to Oregon and Idaho. 



Specimens examined: Clallam County, Elmer 2520; Cascade Mountains, latitude 49°, 

 Lyall in 1859; Coupeville, Gardner 99; Seattle, Piper in 1885; Montesano, Heller 3858; 

 Olympia, ^incazd, July 4, 1896; Chehalis County, Lam6 1154; Silverton, SoucZ; 46; Manor, 

 Piper 3074; Roslyn, WliitedA&^; Klickitat River, Flett 1330; Blue Mountains, Piper, July, 

 1896. 



Zonal distribution: Transition. 



LTJTKEA. 



1. Lutkea pectinata (Pursh) Kuntze, Rev. Gen. PI. 1: 217. 1891. 

 Lutkea sibbaldioides Bong. Mem. Acad. St. Petersb. VI. 2: 130. 1833. 

 Saxifraga pectinata Pursh, Fl. 1 : 312. 1814. 

 Eriogynia pectinata Hook. Fl. Bor. Am. 1 : 255. pi. 88. 1834. 

 Type locality: "Northwest coast." Collected by Menzies. 

 Range: Alaska to Mount Shasta and the Blue Mountains. 



