PIPER FLORA OF THE STATE OF WASHINGTON. 575 



Specimens examined: Cascade Mountains, Lyallin 1800; Vvshastin, Sandberg d; Leibenj, 

 July, 1893; west Klickitat County, Suksdorf 640, 648, 649; Skamania County, Suksdorj 

 2169; Mount Adams, Suksdorf Z^'d , 643; Falcon Valley, SuksdorfMO, 397; Yakima region, 

 Brandegee 857; without locality, Cusick 1821; without locality, 5ran(Ze(/ee 854,855,859; 

 Spokane County, i?amm, July, 1893; Bingen, Suksdorf 2247 ; Spokane, Piper 2379; Pull- 

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



Zonal distribution: Arid Transition. 



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

 lonadis stenomeres Greene, Pittonia 3: 246. 1897. 



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

 Range: Washington to Montana. 

 Specimens examined: Mount Carlton, Kreager 280. 



AsTEK peregrinus Pursh. This is included in Gorman's list of the plants of the 

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

 shows the collection to be a mixture of Erigeron salsuginosus and Asier folia ecus. 



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

 the specimens. 



MACHAERANTHERA. 



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

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

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

 Range: Washington to .Saskatchewan and Texas. 



Specimens examined: Loom is, £'i!mer 60S; Spokane, Piper, September, 1896. 

 Zonal distribution: Arid Traasition. 



la. Machaeranthera canescens viscosa (Nutt.). 



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



Aster canescens viscosus A. Gray, Syn. Fl. 1' : 206. 184^4. 



Type locality: "Near Scott's Bluff, on the Platte." Collected by Nuttali. 



Range: Washington to Wyoming and California. 



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

 WensLche, Whited 1331; Ellensburg, Whited 854; Rattlesnake Mountain, Cotton 478; 

 Columbus, Suksdorf, June 10, 1886; Lake Chelan, La^e cfc Hull, August 16, 1892; near 

 mouth of Okanogan, Watson 197; Coulee City, Lake <fc Hull 691; Colville, Lyall in 1860; 

 Spokane, Sandberg, Heller, & McDougal 912; Waitsburg, Horner 555; Wawawai, Piper 

 1606; Almota, Piper, September, 1896. 



Zonal distribution: Upper Sonoran. 



MADIA. Tarweed. 



Heads small, long-peduncled; disk-flower one 1. M. exigua. 



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

 Leaves all or mostly alternate; ligules small. 

 Rays 5 to 12; involucres campanulate. 



Akenesof the rays broad; herbage lemon-scented 2. M. cifriodora. 



Akenes of the rays compressed; herbage heavy-scented. 



Heads densely congested 4. M. sativa. 



Heads loosely racemose 3. M. racemosa. 



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

 heads densely glomerate. 



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



Stems glandular above; glomerules racemose 6. M. glomerata. 



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



