202 (' n ii'i rsil 1/ of Ciilifoniiii I'lihlicdtifjiis in /Sohnni 1 \ mi.. 7 



lUitzcii \';illcy. where tliei-e ;ire peflui|)s Iwehc s(|iifire miles of cov- 

 siinilis. and in ('atldw \'alley. where thei'e is a soiiiewliat sniaUei' area 

 of the same t'ofm. SUulies made hy the seinof anthof fi'om IJurns to 

 Rend and northward indicate that the phuits there gi'ow too si)ars(»ly 

 to be of interest anil that tlie percentage content is not nnifoi'm. Re- 

 ports of hirjre ai'cas at l'>nft"alo Meadows and on the I5hici< Rock Desert 

 of Nevaihi wci-e fonnd to l)e ei-roneons and it seems that there is hnt 

 litth' of the shrnh in the nort hwcstei-n corner of that state. It is in- 

 teresting to note, however, that two sanij)h's of tlie variety ro))simiHs 

 gathered along tlie edges of the alkali flats neai' (lerlach yielded tlie 

 highest I'etnrns of all of the samples taken of ('hri/si)fli(iiinnis ti(iHS(t>- 

 SKS. They analyzed 4.71 and 0.57 ])er cent, respectively, of pni-e 

 rubber. 



The most impoi'tant areas in tliis district are to he fonnd, there- 

 fore- in eastern Lassen County, California, and in IMitzen and Catlow 

 valleys of southei-n Oregon. The total amount of rubber in the shiMibs 

 thns fai' locati-d in District ?> is estimated at abont 1 ,000, ()()() ponnds. 



,1. DISTRICT 4— WEST CENTRAL NEVADA 

 This small disti'ict lies wholly in Nevada and is between the C'ali- 

 fornia boundary and a line connecting Hazen and Tonopab. (^n the 

 north it is limited by tlie line of the Southern Pacific Railway; on the 

 south, liy an east-and-west line passing through Tonopab. 



The only ^■ariety of ('liri/solh<ninn(s to be considered here as a 

 possible source of rul)ber is (■())isinulis. but this grows in abundance in 

 valley bottoms whei-e the soil is somewhat sandy, slightly moist, and. 

 for the most part, too alkaline for Sage-brush. Around the edges of 

 such areas, and rnnning back into the hills, it is not uncommon to 

 find otliei' varieties, especially those of the gi'ay types like (/risi iis. 

 nauseosiis. and sixciosiis, liut these occur as impurities in the Sage- 

 bi'iisli consociation and ;ire therefoi-e too scattered to be of coiise(|iience 

 as a possible source of rubber. 



The consimiiis foi'iu varies much in size and habit, deixmding in 

 these characters upon soil and clinuitic conditions. Excejitionally large 

 ])lants were encounterc^d on the flats at the head of Walker Lake. 

 These wei'c six feet high and almost tree-like, with ti-unks five inches 

 thick and over a foot in length to the first nuiin branches. Such plants 

 have a weight of atioiit thii'ty ])ounds, exclusive of twigs. The aver- 

 age weight of samples, howevt'r, taken from along Walkej- River, north 

 of the lake is al)0ut ten i)oun(ls, while the average for the whole dis- 



