PIPER FLORA OF THE STATE OF WASHINGTON. 399 



Anthers not versatile. 

 Petals sessile. 



Cah'X lobes reflexed; petals entire. Godetia (p. 409). 



Calyx lobes erect; petals 2-lobed Boisduvalia (p. 410). 



Petals clawed; calyx lobes reflexed Clarkia (p. 411). 



CIRCAEA. 



Leaves denticulate; racemes bractless , 2. (7. jmcijica. 



Leaves dentate; racemes with minute bracts 1.6'. alpina. 



1. Circaea alpina L. Sp. PI. 1: 9. 1753. 



Type locality: "Habitat ad radices montiuiu in frigidis Europae." 



Range: Alaska to Labrador, southward to Washington, Dakota, and Georgia. 



Specimens examined: Olympic Mountains, J. J/. 6'ran< 11; Skokomish Valley, /TincaitZ, 

 May 29, 1892; Blue Mountains, Lake tfc Hull 533; Snoqualmie Falls, Piper, September, 

 1902; Quinault, Conard 133. 



ZoxAL distribution: Canadian. 



2. Circaea pacifica A.schers. & Magnus, Bot. Zeit. 29: 392. 1871. 

 Type locality: San Francisco, California. 



Range: British Columbia and Idaho to California. 



Specimens examined: Seattle, Piper 109; Silverton, BoucJc; upper Nisqually Valley, 

 Allen 301; near Skagit Pa.ss, Lake d; Hull 533; Peshastin, Samlberg c& Leiberg; Blue 

 Mountains, Piper 2409. 



Zonal distribution: Transition. 



GAURA. 



1. Gaura parviflora Dough; Hook. Fl. Bor. Am. 1 : 208. 1830; Lehm. Pug. 2: 15. 1830. 



Type locality: "Sandy banks of the Wailawaliah River." Collected by Douglas, 

 according to Hooker. 



Range: Washington to Dakota, Louisiana, and Mexico. 



Specimens examined: Wawawai, Elmer 898; Piper, July, 1898, and 1629; without 

 locality, Brandegee 789; Prosser, Cotton, 741. 



Zonal distribution: Upper Sonoran. 



ISNARDIA. 



1. Isnardia palustris L. Sp. PI. 1: 120. 1753. 



Litdwigia nitida Miclix. Fl. 1: 87. 1803. 



Ludwigia palustris Ell. Bot. S. C. & Ga. 1: 211. 1821. 



Type locality: "Habitat in Galliae, Alsatiac, Russiae, Virginiac fluviis." 



Range: Washington to Nova Scotia, southward to California, Mexico, and Florida. 

 Europe. Asia. 



Specimens examined: Yakima Region, Brandegee 777; Clarke County . Henderson, Sep- 

 tember 6, 1892; Waitsburg, Horner 585; Seattle, Piper in 1885. 



Zonal distribution: Humid Transition. 



EPILOBIUM. Willow herb. 



Calyx tube not prolonged beyond the ovary; flowers large. Stems 



1 to 2 m. tall; bracts small; style pubescent at base I.E. angusiifoliiim. 



Stems 15 to 50 cm. high; bracts leaf-like; style glabrous 2. E. lafifohuni. 



Calyx teeth prolonged beyond the ovary; flowers mostly small. 



Flowers pale yellow; stigmas 4-cleft 3. E. hiteum. 



Flowers white or pink. 



Annuals; leaves narrow; stigmas mostly 4-cleft. 

 Stems simple or but little branched, 8 to 20 



cm. high ; herbage crisp-puberulent 5. E. minutuni. 



