•J74 



I'nivcrsil ij <ij' California Puhllcdt iaiis in liotdiii/ [Vol. 7 



111 tlir followinj^' labuhit ion of cxaniiimt ions, only nos. 492 and 493 

 fi'|)i-cscn1 1\j)ical liii((irifolii(s : tlic remainder are of llio interior 

 \i\y\v\y. 



'IauU'; S — CiiE.\n(Ai, Axai.vsks 



Pl.ice of Collection 



492 Soutli of Antioch, Cnlif. 



493 South of .Vntioch, Calif. 



701 Mojave Desert, Calif. 



702 Mojave Desert, Calif. 



703 Mojave Desert, Calif. 

 714 Near Hesperia, Calif. 



.MicKo.scopicAL Examination 



Place of Collection 

 89 Del Sur, .\nt elope \^>>lley, (^alif. 



Date of 

 Collection 



.Ian. 19, 1918 



Estimated 

 .Amount 



Poor 



II. REGIONAL DISTRIBUTION OF RUBBER IN 



HAPLOPAPFVS 



We liave sliown that Chrj^sil is peculiar to tlie ])art of the plant 

 above ground, analyses of root and stem indieatinji- that below a point 

 approximateh' 10 cm. beneath the soil line rubber occurs in negligible 

 (quantities even if the parts above are relatively rich in this substance. 

 In tlie ease of at least two species of Haplopappus a different distri- 

 bution obtains as is indicated by the results given in the following 

 table. 



