THE PLANT WORLD. 41 



where the ground must bo SMliinited wilh oil. r>iit jis soon ms the oil 

 covers the stems and leaves of plants, tliev die. That irrcasy tenacious 

 stiiir stoj)s all the pores: the breathing is hindered, and the plant dies 

 from choking, as may be proved by experiment. 



In spite of my bad success last year 1 hojx' to lind some more 

 plants of Ajxn-i/iiiiiti jHihrsc, Its the coming season, and secure at the 

 same time the fruit, whicii I missed in I.S'.KS. 

 Saint Marys, Ohio. 



THE TWIN-LEAF {-fefersonla diphylho IN IOWA. 



By L. II. Pammki.. 



Many of the Perberidacea: are (|uit(^ restricted in their distriI)ution. 

 In the region of (xray's Manual l»ut rive species in as many genera are 

 recorded. J'he commonly occuiring species in Iowa. Wisconsin and 

 Minnesota are ('a>//oj)/it///>///i tlntl'icf ri>'nl< s, and Pix/oji/n/ll mn j>r/f<ifiii,i . 

 litn'hcvh ('tii)ti(h iisis and I)i jtjiiillihi <-i/iti)>s(i are conHned to the 

 Alleghanies. Jiifi-rson'm i/ijiln/lla is, according to Gray's JSIanual, 

 distributed to woods from western New York to Wisconsin and south- 

 ward. Mr. L. Pursell AValker, a s[)ecial student in botany, reports 

 that 'Ji^if'i'i'mii'ni </!j>Jn/ll<i is common in one place four and a half 

 miles southwest of Cleremont, It occurs on a north hill slope well 

 weltered, being in close proximity to a series of large springs. The })lanl 

 covers about half an acre, and this is tlie only })lace it occurs in that 

 vicinity. ////<// v/.v//.v ('(iinnh ris!.^ which has the same general dis- 

 tribution also occurs in that region. Adv.fd AluxrhatilliiHi is like- 

 wise rei)orted from this region as is Phegopttrl^ cnhutfru . Several 

 interesting conifers should also be reported as somewhat out of their 

 range. Tamjs i'<iiui<hiwlf< and Ahicx hulsnima both occur in the region 

 of Cleremont. 



Ames, Iowa. 



Afe'cording to a Farmers Bulletin recently issued by the Depart- 

 ment of Agriculture there is a grood pros})ect of reclaiming most of 

 the alkaline lands of the West by the growing of Sal t bushes (. I ///yyAv), 

 a nund)er of species of which have been very successfully introduced 

 from Australia. Thev will thrive in soil so strongly inii)regnated with 

 alkali that none of the cereals, grasses, or clovers will grow, the crop 

 l^eing from 15 to 2<> tons of green food, or •> to 5 tons of drv forage, 

 per acre. 



