406 



The (lid'crenl paris ol' llic pliuil are uIUîh \ery loiij,'; lluis 

 the inlernodes, tViiil-slalks and leaf-stalks measured as much 

 as 14 cm. 



Andersson & IIessselman (1. c.) iiave proved that the var. 

 Spitzhergensis, establisiied by Nathorst (1. c), is a hybrid be- 

 tween A', lapponicus and the present species; it is llie oidy 

 hybrid known from Spitzbergen. In rcf^vird to the majority of 

 the characters of this variety it is intermediate between the two 

 parents, and Andersson & Hesselman have a long series of state- 

 ments concerning such characters, as, for example^ comparisons 

 of the leaves, the lower ones of which in B. Fallasii are 

 usually tripartite and the upper ones entire and lanceolate, 

 while in the hybrid they are relatively broader and 5 or 3-partite. 

 Again in H. Fall, the lamina almost continues the direction of 

 the stalk; in B. lapp. it stands at an angle with the stalk; 

 while the hybrid is intermediate in lliis respect. 



Tlie flower has three perigone-leaves ; in B. Pallasii it 

 has 7, or sometimes 6 — 8 white nectary-leaves, but in the hybrid 

 there are usually 6 greenish-yellow nectary-leaves. The nectary- 

 leaves are somewhat longer than the 

 perigone-leaves. The diameter of the 

 flower is usually 15 mm. in B. Pallasii 

 and somewhat smaller in the hybrid. 

 The nectaries are simple and pocket- 

 shaped (Fig. 47, A). The flower in 

 both has a strong perfume, according 

 to Nathorst that of B. Pallasii is re- 

 miniscent of Platanthera. The flowers 



A. B 



Fig. 47. E. Pallasii. 



A. Neciary-ieaf (Vi). B. Carpel (11. are proterogyuous-homogamous in B. 



8. 188-2; i'/i). C. Almost ripe fruit 



(Siberia; 18. 6. 1876; Herbarium- PalUlSll aCCOrdiug tO EkSTAM who liaS 



material; v.). obser\ed the visit of small Diptera. 



The carpels in B. Pallasii have an almost straight beak, the 

 hybrid is intermediate in this respect between B. Pallasii and 

 .ß. lapyonicus with its markedly bent beak. 



