358 Plants of San Francisco. [zok 



239. Franseria bipinnatifida Nutt Trans. Am. Phil Soc. 

 vii, 344. With the preceding and apparently connected by Various 



forms. 



240. Xanthium Canadense Mill Diet. Ed. 8. Waste places 

 near the Presidio and South San Francisco. Not common. June- 

 September. ** Cockle-Bur.'^ 



241. Xanthium spinosum L. spec. 1400. A common weed espe- 

 cially about South San Francisco and Visitacion Valley. June — 

 October. ''Spiny Cockle-Bur." 



242. Wyethia angustifolia (DC. Prodr. v, 537). Mission 

 Hills. April— June. 



243. Helianthella Californica'^ Gray. Pac. R. Rep. iv, 



103. Mission Hills towards Ocean View. April — May. 



244 



t 



245. Madia sativa Mol. Chil. ed. Germ. 113, Common. 

 April — July. The worst of our *'Tarweeds." 



246. Madia dissitiflora Nutt. Trans. Am. Phil. Soc. vii, 387. 

 Mission Hills. April — ^June. 



247. Madia filipes Gray. Laurel Hill Cemetery. May. 



248. Hemizonia LUZUL.EFOLIA DC. Prodr. v, 692. Potrero, 

 South San Francisco. June — September. 



249. Hemizonia angustifolia;}: DC. Prodr. v, 692. Mission 

 Hills, Hills near Visitacion Valley. ' June — August. 



250. Hemizonia pungens (H. & A. Bot. Beechey, 357.) North- 

 ern part of the city about Telegraph Hill. July. ** Prickly Tar- 

 weed." 



251. Hemizonia paniculata Gray, Proc. Am. Acad, xix, 17. 

 Near Telegraph Hill and Black Point. June — July. 



252. Hemizonia fasciculata§ DC. Prodr. v, 693. About 

 Black Point. June — August. 



*Zoe, ii, 75- 



tThis plant formerly grew in a deep swamp at Seventh and Mission Streets. 



JThe obscure ZT. congesta is intermediate between this and the above and may be 

 a hybrid, 



^The three last species do not properly belong to the Coast flora having been in- 

 troduced in wool, grain, etc. 



