272 MINNESOTA BOTANICAL STUDIES. 



It approaches more closely the variety abietina, and because 

 of the fact that only fragmentary material of the latter is at 

 hand for comparison, it is more difficult to show the essential 

 differences, except in so far as those already pointed out for the 

 species include those for the variety also. 



From the material examined it is clear that the plant found on 

 the hemlock has the calyx lobes more ovate in shape, and the 

 fruit possesses a slightly shorter and thicker beak than in var. 

 abietina. 



With sufficient authentic material for comparison its affinities 

 could perhaps be more definitely established. 



It does not seem consistent to refer this plant to the variety 

 when it is borne in mind that as far as observations go it is found 

 exclusively on Tsuga heteropkylla in a forest where abound such 

 species as Abies grandis, the tree upon which the variety was 

 first collected, Abies amabilis^ Pinus monticola^ Pinus contorta 

 and various other conifers. 



The hemlock is found almost everywhere on the west coast 

 mixed with the trees mentioned above, but in no case whatever 

 was the parasite found on any other tree than Tsuga heterophylla 

 Sarg. 



There seems sufficient reason for giving the plant specific 

 rank and the name Razoumofskya tsugensis is proposed. 



The type specimen is deposited in the herbarium of the Uni- 

 versity of Minnesota. 



Razoumofskya tsugensis sp. nov. 



Stems slender, paniculately branched ; terminal branches of 

 the staminate plants often apparently dichotomous : stem 1.5 

 mm. in diameter at the base: staminate plants 3-11 cm. high, 

 brownish-yellow in color: flowers 1-13, sessile in the axils of 

 the connate leaves of the branches, forming spicate inflores- 

 cences 4-24 mm. long : internodes of the flowering branches 

 2.5-3.5 mm. long: calyx 4-parted ; lobes ovate, acute, thick: 

 anthers sessile and attached about the middle of the calyx 

 lobes : buds of the lateral flowers slightly flattened dorsi-ven- 

 trally, the terminal ones globose: expanded flower 3.5-4 mm. 

 in diameter. 



Pistillate plants 4-12 cm. high: generally darker in color 

 than the staminate : flowers borne as in the staminate plants : 

 branches flower-bearing for the last 1-6 nodes : internodes 3.5- 



