PIPER—FLORA OF THE STATE OF WASHINGTON. 399 
Anthers not versatile. 
Petals sessile. 
Calyx lobes reflexed; petals entire... Gopetia (p. 409). 
Calyx lobes erect; petals 2-lobed.... .. . BortspvvaLia (p. 410). 
Petals clawed; calyx lobes reflexed._..... . CvarKIA (p. 411). 
CIRCAEA. 
Leaves denticulate; racemes bractless..................22-.22..22---.. 2. C. pacifica. 
Leaves dentate; racemes with minute bracts........-.---2 2222-22202... 1. C. alpina. 
1. Circaea alpina L. Sp. Pl. 1: 9. 1753. 
Tyre Locauity: ‘ Habitat ad radices montium in frigidis Europae.”’ 
Rance: Alaska to Labrador, southward to Washington, Dakota, and Georgia. 
SPECIMENS EXAMINED: Olympic Mountains, J. M. Grant 11; Skokomish Valley, Kincaid, 
May 29, 1392; Blue Mountains, Lake & Hull 533; Snoqualmie Falls, Piper, September, 
1902; Quinault, Conard 133. 
ZONAL DISTRIBUTION: Canadian. 
2. Circaea pacifica Aschers. & Magnus, Bot. Zeit. 29: 392. 1871. 
TYPE LOCALITY: San Francisco, California. 
RanGE: British Columbia and Idaho to California. 
SPECIMENS EXAMINED: Seattle, Piper 109; Silverton, Bouck; upper Nisqually Valley, 
Allen 301; near Skagit Pass, Lake d& Hull 533; Peshastin, Sandberg & Leiberg; Blue 
Mountains, Piper 2409. 
ZONAL DISTRIBUTION: Transition. 
GAURA. 
1. Gaura parviflora Doug].; Hook. Fl. Bor. Am. 1: 208. 1830; Lehm. Pug. 2: 15. 1830. 
Tyre Locauity: “Sandy banks of the Wallawallah River.’’ Collected by Douglas, 
according to Hooker. 
Raner: 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. Pl. 1: 120. 1753. 
Ludwigia nitida Michx. Fl. 1: 87. 1803. 
Ludwigia palustris Ell. Bot. S.C. & Ga. 1: 211. 1821. 
Type Locaity: ‘Habitat in Galliae, Alsatiae, Russiae, Virginiae fluviis.”’ 
Rance: 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 .......... 1. 2. angustifolium. 
Stems 15 to 50 cm. high; bracts Jeaf-like; style glabrous. __ ._ - 2. EF. latifolium. 
Calyx teeth prolonged beyond the ovary; flowers mostly small. 
Flowers pale yellow; stigmas 4-cleft .....-.......-2-.-.--.--- 3. FE. luteum. 
Flowers white or pink. 
Annuals; leaves narrow; stigmas mostly 4-cleft. 
Stems simple or but little branched, 8 to 20 
em. high; herbage crisp-puberulent...........-.-.. 5. £. minutum. 
