DIVISION EIGHT — SCIENCE. 645 



BIDENS Linn. 



B. CHRVSANTHUMOIDES Micbx. O. K.; A. S. 



B. Pir.oSA Linn. Along streets. July — October. 

 MADIA Molina. Tar-weed. 



M. DISSITIKLOR-A. (Nutt) T. & G. Along street. July— Septeniher. 



M. SATiVA Mol. Frequent below 1,800 feet. June — .August. 

 HEMIZONL\ DC. Tar-weed. 



H. FASCicuLATA (DC.) T. & G. var. ramossima Gr. Com. Below i>j<j feet. 

 May — July. 



H. PUNGENS Torr. & Gray. Frequent below 1,800 feet. May — .August. 



H. TENELLA Gray. O. K.; A. S. April — June. 

 LAYIA Hook. & Arn. 



L. GLANDULOS.A. (Hook.) H. & A. O. K.; A. S. April— June. 



L PL.\TYGLOSSA (F. & M.) Gray. (Tidy-tips) Com. below 2, o<xj feet, .^pril— June. 

 ACHYRACHAENA Schauer 



A. MOLLIS Schauer. Near Oak Knoll. March — May. 

 BAERIA Fisch. & Mey. 



B. GRACILIS (DC. ) Gr. Com. below 2,000 feet. March — May. 

 ERIOPHYLLUM Lag. 



E. CONFERTIFLORUM (DC.) Gr. Com. in unbroken soil below 3,ofxj feet. April — 

 June. 

 CH^NACTIS DC. "Pin-cushion." 



C. ARTEMisiAEFOLiA Gray. Frequent in dry unbroken soil below 3,000 feet. 

 June — July. 



C. GLABRIUSCULA DC. Frequent on dry hills. May — ^June. 



C. lanosaDC. Com. below 3,000 feet. April — ^June. 

 HELENIUM Linn. Sneeze-weed. 



H. PUBERULUM DC. O. K.; A. S., canyons of S. G. Mts. June — October. 

 ACHILLEA Linn. Yarrow. 



A. MILLEFOLIUM Liun. Com. in foothills of S. G. Mts. and adjacent plains. May 

 August. 

 ANTHEMIS Linn. Chamomile. 



A. coTULA Linn. Com. below 1,500 feet. April — ^July. 

 MATRICARIA Linn. 



M. DiscoiDEA DC. Com. below 1,500 feet. February — April. 

 ARTEMISIA Linn. Worm-wood. "Sage-brush." 



A. CALIFORNICA Less. (California "Sage-brush.") Com. in dry unbroken soil 

 below 4,000 feet. May — August. 



A. DRACUNCULOiDES Pursh. Frequent below 2,000 feet. May — August. 



A. LUDOViciANA Nutt. Occasional below 2,000 feet. June — August. 



A. VULGARIS Linn. var. californica Bess. Common below 2,500 feet. June — 

 August. 

 TETRADYMIA DC. 



T. COMOSA Gray. Near Devil's Gate. July — August. 

 LEPIDOSPARTUM Gr. 



L. SQUAMATUM Gr. A. S., foothills S. G. Mts. July — September. 

 SENECIO Linn. Groundsel. 



S. CALiFORNicus DC. Com. below 3,000 feet. March — May. 



S. DOUGLASii DC. Hills along A. S., foothills S. G. Mts. July— September. 



CARDUUS Tourn. Thistle. 



C. CALIFORNICUS (Gr.) Greene. O. K., R. C. May— July. 



C. occiDENTALis Nutt. Frequent below 2,000 feet. April — ^June. 

 SILYBUM Gaerth. Milk-Thistle. 



S. MARiANUM (Linn.) Gaerth. Near Oak Knoll. May— July. 

 CENTAUREA Linn. Star-Thistle. 



C. MELiTENSis Linn. Com. below 2,000 feet. May — August. 



PEREZIA Lag. 



P. MICROCEPHALA Gr. O. K., A. S., foothills S. G. Mts. June— August. 



MICROSERIS Don. 



M. LiNEARiFOLiA Gr. Com. below 3,5ck) feet. February— May. 



