PIPER FLOliA OF THE STATE OF WASHINGTON. 287 



ALYSSUM. 



1. Alyssum alyssoides (L.) Gouan, Hort. Monsp. 321. 1762. 

 Clypeola alyssoides L. Sp. PI. 2: 652. 1753. 

 Alyssum calycinum L. Sp. PI. ed. 2. 2: 908. 1763. 

 Type ixkjality: "Habitat in Austria, Gallia." 

 Specimens examined: Seattle, Piper in 1885; Pullman, Piper. 



DRABA. 



Annuals. 



Flowers white. 



Petals deeply 2-clef t 1 . D. vema. 



Petals entire; pods hispid 2. D. caroliniaiui ndcrantha. 



Flowers yellow. 



Pods 6 to 8 mm. long, much shorter than pedicels. . 3. D. neinurosa. 

 Pods 8 to 15 mm. long, about equaling the pedicels . . 4. I), stenoloba. 

 Perennials. 



Midrib of leaves becoming prominent. 



Flowers yellow; pods acute 5. D ytacialis. 



Flowers white ; pods acuminate 6. V. douglasii. 



Midrib of leaves not prominent. 



Stems scapose; flowers white "i. D. lonchocarpa. 



Stems very leafy ; flowers yellow. K. D. aureola. 



1. Draba vema L. Sp. PI. 2: 642. 1753. 

 Type locality: Europe. 



Specimens examined: Vancouver, Suksdorf 499; T. E. W\lcox, March, 1883; Walla 

 Walla, Leckenhy, April, 1898; Waitsburg, Horner 606. 



2. Draba caroliniana micrantha (Nutt.) A. Gray, Man. ed. 5. 72. 1867. 

 Draba micrantha Nutt.; Torr. & Gr. Fl. 1: 109. 1838. 



Type locality: "Open plains and rocky places about St. Louis, and in Arkansas." 

 Range: Washington to Illinois, Texas, and New Mexico. 



Specimens examined: North Yakima, Henderson, May, 1892; Spokane, Piper, May, 

 1897; Waitsburg, Homer 74; Wawawai, Piper 2801. 

 Zonal distribution : Arid Transition and Upper Sonoran. 



3. Draba nemorosa L. Sp. PI. 2: 643. 1753. 

 Type locality: "Habitat in Sueciae nemoribus." 



Range: British Columbia to Colorado and the Great Lakes. Europe. Siberia. 



Specimens examined: Whidby Island, Gardner 25; White Salmon, Suksdorf 232; Fort 

 Colvillc, LyaU in 1861; Geyer 626; Hangman Creek, Sandberg cfc Leiberg 4; Pullman, Piper 

 1794; Elmer 151; Almota, Piper, April, 1894; Waitsburg, Horner 608; Wawawai, Piper 

 2800. 



Zonal distribution: Upper Sonoran and Arid Transition. 



4. Draba stenoloba Ledeb. Fl. Ross. 1: 154. 1841. 

 Type locality: "In ins. Unalaschka." 



Range: Alaska to Colorado and California. 



Specimens examined: Olympic Mountains, Flett 102; Mount Baker, Flett 851; Klicki- 

 tat River, Flett 1142 in part; Yakima County, Henderson 2385 B; Stevens Pass, Sandberg 

 cfc Leiberg 758; Wenache Mountains, Elmer 434; Wenache Mountains, Cotton 1288. 



Zonal distribution : Hudsonian . 



5. Draba glacialis Adams, Mem. Soc. Nat. Mosc. 5: 106. 1817. 



Type locality: "In promontorio Byskofskoymys," near the mouth of the Lena River, 

 Siberia. 



