PIPER FLORA OF THE STATE OF WASHINGTON. 329 



Flowers dark purple; rt- 



ceptacle spongy Com arum (p. 341). 



Flowers yellow; receptac'le 

 dry- 

 Plant stoloniferous; 



flowers solitary Argentina (p. 341). 



Plant not stolonifer- 

 ous; flowers cjTnose. Drymocallis (p. 342). 

 Styles persistent, terminal, mostly plumose or geni- 

 culate. 



Calyx lobes and petals S or 9 Dryas (p. 343). 



Calyx lobes and petals .5. 



Styles jointed, the upper part deciduous.. Geum (p. 343). 

 Styles not jointed, p]\mu)se or naked... . Sieversia (p. 344). 

 Shrubs or trees. 



Stylesverylongandplumoseinfiuit; petals none. Cercocakpus (p. 345) 

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



OPULASTER. NiNEBAKK. 



Carpels pubescent, not exceeding the calyx 1.0. pauciforus. 



Capsules glabrous, much exceeding the calyx 2.0. opuUfolius. 



1. Opulaster pauciflorus (Torr. & Gr.) Heller, Bufl. Torr. Club 25: 5S1. 1898. 

 Spiraea opulifolia paucijlora Torr. & Gr. Fh 1: 414. 1S40. 



Neillia malvacea Greene, Pittonia 2: 30. 1889. 



Opulaster malvaceus Greene, Eiythea 2: 194. 1895. 



Physocarpus paucijforus 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; Claiks Spiings, 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; :\Iontesano, Heller 3858; 

 Olympia, £rir]fa?(/, July 4, 1896; Chehalis County, Za/^iZ* 1154; Silverton, .Bowrt 46; Manor, 

 Piper 3074; Roslyn, Whifed 459: 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. Peteisb: \l. 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. 



