PIPER FLORA OF THE STATE OF WASHINGTON. 575 



Specimens examined: Cascade Mountains, LijuU in 1800; Pi'sliastin, Saiulbcry tt Lelbciy, 

 July, 1893; west Klickitat County, Sulcsdoif 640, 648, 649; Skamania County, Snkfidorj 

 2169; Mount Adams, Suksdorf 339, 643; Falcon Valley, Suksdorf3i0, 397; Yakima region, 

 Bramlegee 857; without locality, Cusirk 1821; without locality, Z?ra/((Zcfy('e 854,855,859; 

 Spokane County, i?crmm, July, 1893; Bingen, Suksdorf 2247 ; Spokane, Pi^oe/' 2379; Pull- 

 man, Piper 1605; Waitsburg, Horner, August, 1896. 



Zonal distribution: Arid Transition. 



20. Aster stenomeres A. Gray, Proc. Am. Acad. 17: 209. 1882. 

 lonactis stenomeres Greene, Pittonia 3: 246. 1897. 



Type locality: "Rocky Mountains of Montana and Idaho, Burke, Watson." 

 Range: Washington to Montana. 

 Specimens examined: Mount Carlton, Kre.agcr 280. 



Aster peregrinus Pursh. This is included in Gorman's list oC tiie plants of the 

 Washington Forest Reserve. An examination of the specimen in the National llerharium 

 shows th(» collection to be a mixture of Er'ujeron salsuginosu.s and Aster foUa ecu s. 



Aster adscendens Lindl. is included in Suksdorf's list, but we tjuestion the identity of 

 the specimens. 



MACHAERANTHERA. 



1. Machaeranthera canescens (Pursh) Greene, Pittonia 3: 59. 1896. 

 Aster ccineseenx Pursh, Fl. 2: 547. 1814. 

 Type locality: "On the banks of the Missouri." 

 Range: Wasliington to Saskatchewan and Texas. 



Specimens examined: Loomis, Elmer 608; Spokane, Pij>er. September. 1896. 

 Zonal distribution: Arid Transition. 



la. Machaeranthera canescens viscosa (Nutt.). 



Dieteria viscosa Nutt. Trans. Am Phil. Soc. 7: 301. 1840. 



Aster canescens viscosus A. Gray, Syn. Fl. 1': 206. 1884. 



Type locality: "Near Scott's Bind', on the Platte." Collected l)y Nuttall. 



Range: Washington to Wyoming and California. 



Specimens examined: North Yakima, Watt, August, 1895; Henderson, October 5, 1892; 

 Wenache, IFAi^ed 1331 ; Ellensburg, Whited 854; Rattle.snake Mountain, Cotton 478; 

 Columbus, Suksdorf, June 10, 1886; Lake Chelan, Lake tt- Hull, .\ugust 16, 1892; near 

 mouth of Okanogan, Watson 197; Coulee City, Lake cfc Hull 691; Colville, Li/nll in 1860; 

 Spokane, Sandherg, Heller, & McDougul 912; Waitsburg, Horner 555; Wawawai, Piper 

 1606; Almota, Piper, September, 1896. 



Zonal distribution: Upper Sonoran. 



MADIA. Tarweed. 



Heads small, long-peduncled; disk-flower one I. M. exigua. 



Heads larger, sessile or short-peduncled ; disk-flowers several. 

 Leaves all or mostly alternate; ligules small. 

 Rays 5 to 12; involucres campanulatc. 



Akenes of the rays broad; herbage lemon-scented 2. M. cUriodora. 



Akenes of the rays compressed; herbage heavy-scented. 



Heads densely congested 4. M . sativa. 



Heads loosely racemose 3. M. ivcemosa. 



Rays 1 to 5, sometimes none; involucre laterally compressed; 

 heads densely glomerate. 



Stems glandular to the base; glomerules loosely cymosc ... 5. M. ramosa. 



Stems glandular above ; glomerules racemo.<5c 6. M. glomcrata. 



Leaves all or mostly opposite; ligules large 7. M. madioides. 



