VOL.11.]. Plants of San Francisco. 361 



\ 



mea xv. 91. Near Lake ^Nlerced, Mission Hills, Presidio. " Worm 



wood." 



279. Artemisia pycnocephala (Less, in Linmea, vi, 524). 



Common in the western part of the city. March— July. 



280. Artemisia dkacunculoides Pursh. Fl. ii, 742. Near the 

 entrance to Black Point. July— September. 



281. Seiiccio vulgaris ^.. s^^c. \2\b. Common. March— June. 



"Groundsel." 



282. Senecio aronicoides DC. vi, 426. Strawberry Hill. 

 Mission Hifls, South San Francisco. March— May: 



283. Cnicus quercetorum Gray Proc. Am. Acad, x, 40. Mis- 

 sion Hills, Point Lobus, South San Francisco. March— May. 

 " Ground Thistle." 



284. CxXiCUS occiDENTALis (Nutt. Trans. Am. Phil. Soc. vn, 

 418). Common, more or less in bloom for the greater part of the 

 year. " Western Thistle. " 



285. Cnicus edulis (Nutt. Trans. Am. Phil. Soc. vii, 420.) 



Common in swampy places. April — ^July. 



286. Sylihtm Marianum'' (L. spec. ii53)- Common, flowering 

 most of the year. " Milk Thistle." 



287. Ccntcmrea Melitensis L. spec. 1297. Common. April 

 August. " Star-Thistle." 



288. Centaurca sohtitialis L. spec. 1297. Less con.mou than 



the last 



289. Centaurca Cyanus L. spec. 1289. Occasionally escaped 

 from cultivation. May-August. " Blue-Bottle," <' Corn Flower. 



290. MiCROSERis SYLVATICA (Benth. PI. Hartw. 320). Depres- 

 sions on the hillside north of Mountain Lake^ May— June. 



291. 

 mon. April — May. 



■t 



Com- 



292. MICROSERIS LiNDLEVi (DC. Prodr. vii, 85). Lcss com- 

 mon than the preceding^^_Nea^^ 



~^U.. Behr remarks (Zoe, ii. 5) that he had not s^n this this Ue P^^^^^^^ 

 but its date of introduction must have been much earher, as it .as 

 already extremely abundant in the Sacramento \ alle) . 



tZoe. i. xz6. M. ,na.rock.ta described from immature specmens, and credited 



to the Vicinity of San Francisco is undoubtedly th.s species. 



