27'-' 



I'tiirrralh/ of CaliforuM Publications in Botanjj [Vol.7 



Haplopappus pinifolius Gray. 

 Til is soutluM'ii Califoi'iiia sijccics is much like //. (ricoides. One 

 c'olh'ftion (129) made near San Bernardino, was examined micro- 

 seopieally, and found to eontain hut a small amount of iiii>l)er. A 

 second samjile was taken in San FciMiatido \'all('y and fduiid to con- 

 tain 1.(11 pel' cent in the hasal portion of the stem. 



Haplopappus monactis rJray. 



This is a good sized shruh, commonly two or three feet high, 

 sometimes six feet high and with a trunk diameter of foni- inches; 

 in one case there were three principal branches, each one to tliree 

 inclu's thick. The weight is estimated at five pounds foi- average 

 plants; thirty pounds for exceptionally large ones. The species is 

 most abundant around the westerly extensions of the Mojave Desert 

 but it grows at many places along the desert borders and east into 

 southern Nevada; also to a very limited extent on the coastal slope 

 of southern California. One large shrub (90) was collected near 

 Elizabeth Lake and examined microscopically. It appeared to con- 

 tain a fair amount of rubber. A much smaller one (713) from near 

 Hesperia Avas analyzed and found to contain only 0.38 per cent of 

 rultber. 



Haplopappus laricifolius Gray. 



Very close botanically to //. nianacti'S, this species is also like it 

 in habit, general appearance, and rid)ber content. It grows in south- 

 ern Arizona, but apparently it is not abundant. Five samples have 

 been examined with the result indicated below. 



Table (i — Ohe\iic.\l A>f\LYSEs 



Place <if Collection 



760 Near Tucson, Ariz. 

 783* Santa Catalina Mts., Ariz. 

 783t Santa Catalina Mts., Ariz. 

 786* Tucson Mts., Ariz. 

 78fit Tucson Mts., Ariz. 



* Stem, 

 i' Root. 



MiCRO.SCOI'ICAI. KXAMIN'.VTION 



Place of Collection 



1.58 Near Tucson, .\ri/.. 



Date of 

 Collection 



.Julv 27, 191.S 



Estimated 

 .Vniount 



Fair 



