ly revolute margins, the stems and the petioles are furnished with long, white, spreading 

 hairs, several mm. long, which all of them are characters recalling, to a certain extent, 

 P. sericea, and not to be found in Bunge's authentic specimens of P. soongorica, which 

 I had the opportunity to see in the Herbarium of the Imperial Botanical Gardens of Peter 

 the Great in Petrograd. The specimens are remarkably flowery, and the diameter of the 

 individual flowers, varying between 12 and 14 mm., also considerably exceeds that of 

 the typical P. soongorica Bunge. The outer sepals are broader, nearly clavate, not linear, 

 as in the typical P. soongorica. A rather rich material of the latter variety has been col- 

 lected by me on the steppes on the Yenisei, near Ust Abakansk, where in incipient flow- 

 ering at the beginning of June. 



Distribution: The species is distributed over Turkestan, Dzungaria, the Altai region, 

 Mongolia, northern China. 



Potentilla sibirica Wolf in Aschers. et Graebn. Synops. VI (1904) p. 698; Wolf, 

 Monogr. Gatt. Potentilla p. 188. P. pennsglvanica Ledeb. Fl. Ross. II, p. 40; var. genuina 

 Wolf, 1. c. p. 189. P. strigosa Bunge in Ledeb. Fl. Alt. II, p. 237; Bunge, Enum. Alt p. 30; 

 Turczan. Fl. Baical.-Dahur. (1843) p. 617, no. 413. P. pennsglvanica var. strigosa Lehm. 

 Monogr. Potentill. p.55; Epwji. $ji. Ajit. 11 (1903) p. 380. P. pennsglvanica a Ledeb. Fl. 

 Ross. II, p. 40. 



The specimens collected always have the margins of the leaves much revolute. 

 Rather common about the river Abakan, in open thickets of foliage trees, in the outskirts 

 of forests of foliferous trees, etc. With some young flowers, but as yet chiefly with flower- 

 buds in the middle of June. 



Near Ust Kamuishto I have collected some individuals of a rather vigorous form, 

 the sepals of which are rather densely beset with yellow, glandular hairs. In the shape of 

 the flower and the vegetative shoot for the rest, especially so in the leaves, distinctly 

 felted underneath, with markedly revolute margins, the form agrees perfectly with P. sibi- 

 rica, while the glandulous sepals and the markedly spreading, long, white hairs of the 

 stem and the petioles, albeit scattered, are indicative of some connection with P. tana- 

 cetifolia. As the specimens are as yet so young, without fully opened flowers, I have 

 not been able to examine the carpels. According to Wolf, 1. c. p. 316, the bastard be- 

 tween the said species did not seem to be unfrequent in Siberia, and the above-mentioned 

 specimens seemed to have to be referred to this combination. 



Distribution: Ea.stern Russia, Siberia, to Trans Baikal, Turkestan, Mongolia. 



Potentilla nivea L. Spec. PI. ed. II (1762) p. 715; Wolf, Monogr. Gatt. Potentilla p. 

 233; Ledeb. Fl. Alt. II, p. 260; Turczan. Cat. Baical. no. 408; Karel. et Kiril. Enum. PI. Fl. 

 Alt. no. 314; Ledeb. Fl. Ross. II, p. 57; Turczan. Fl. Baical.-Dahur. (1843) p. 606, no. 399; 

 KpBU. <D.i. Ajit. II (1903) p. 389. 



var. elongata Wolf, 1. c. 



In the Altaian, at an altitude of about 1900 m. above sea-level, in stony and grass- 

 grown places. Flowering at the end of July. 



2S4 



