PIPER FLORA OF THE STATE OF WASHINGTON. 319 



MITELLA. 



Stamens opposite the pinnatifid green petals 1. M. pentandra. 



Stamens alternating with the petals. 

 Calyx green; petals pinnatifid. 



Stems bearing 1 to 3 leaves ; stoloniferous 2. M. cavJescens. 



Stems leafless; not stoloniferous. 



Leaves broadly reniform-cordate 3. M. hreweri. 



Leaves ovate 4. M. ovcdis. 



Calyx white; petals trifid or entire. 



Petals entire ; calyx-lobes obtuse 5. M. micrantha. 



Petals 3-cleft or 3-parted. 



Raceme secund; petals 3-parted with filiform divaricate 



lobes 6. M. stauropetala. 



Raceme not secund; petals cuneate, 3-cleft at apex, the 

 lobes not divaricate. 



^ Calyx-lobes obtuse; leaf lobes rounded 7. M. trifida. 



Calyx-lobes acute; leaves angularly lobed 8. M. diversifolia. 



1. Mitella pentandra Hook. Bot. Mag. 56: pi. 2933. 1829. 

 Drummondia mitelloides DC. Prod. 4: 50. 1830. 

 MiteUopsis drummondii Meisn. PI. Vase. Gen. 1: 100. 1836. 



Type locality: "Rocky Mountains of North America." Type specimen raised from 

 seed collected by Drummond. 



Range: British Columbia to Saskatchewan, Colorado, and Oregon. 



Specimens examined: Olympic Mountains, Piper, August, 1895; Henderson, July 11, 

 1892; Mount Rainier, Piper 2028 ; upper Nisqually Valley, ^ZZen 5; Mount Siu&ri,Sandberg 

 cfc Leiberg, June, 1893, 567; Stevens Pass, Piper, July, 1895; Wenache Mountains, Elmer 

 165; Skokomish Valley, Eincaid, June, 1892; Cascade Mountains, Henderson, August, 

 1892; Horseshoe Basin, LaJce & Hull, August, 1892; Blue Mountains, Horner 122; Piper 

 2410. 



Zonal distribution: Hudsonian. 



Rydberg considers that two species have been confused under M. pentandra, desig- 

 nating them as Pectiantia pentandra and P. latijlora Rydberg.a The somewhat larger 

 flowers and hairy petioles of the latter are considered diagnostic, but we find all interme- 

 diates in the size of the flowers and also find hairy petioles on small-flowered plants. Both 

 extremes as to the size of the flowers occur in the Cascade Mountains. 



2. Mitella caulescens Nutt.; Torr. & Gr. Fl. 1: 586. 1840. 

 Mitellastra caulescens Howell, Fl. N. W. Am. 201. 1898. 



Type locality: "Shady woods of the Oregon near the mouth of the Wahlamet." Col- 

 lected by Nuttall. 



Range: British Columbia to Oregon and north Idaho. 



Specimens examined: Seattle, Piper 90; Skokomish Valley, Kincaid, May, 1892: 

 upper Nisqually Valley, Allen 9; Falcon Valley, Suksdorf 365; woods of the Columbia, 

 Nuttall; lower Frazer River, latitude 49°, Lyall in 1859; Mount Carlton, Kreager 203. 



Zonal distribution: Humid Transition. 



3. Mitella breweri A. Gray, Proc. Am. Acad. 6: 533. 1865. 



Type locality: "Mount Hoffman, in a damp place at about 11,000 feet altitude", 

 California. Collected by Brewer. 



Range: California to British Columbia and north Idaho. 



Specimens examined: Baldy Peak, Lam6 1347; Mount Rainier, Piper 2030; Allen AS; 

 Flett 303; Goat Mountains, Allen 86; Mount Adams, Henderson, August, 1892; Suksdorf 

 364; Nason Creek, Sandberg c& Leiberg 661. 



Zonal distribution; Hudsonian. 



oN. Am. Fl. 22^:86. 1906. 



