- ^65 - 



Chiwa: N. 1988, iu cultivated land. July 15. 1899. 

 Area: Europe, western and middle Asia, East-India, Sibiria. 



:>. P. balsamifera L.; Hook. 11. bril. lud. V p. 638; 0. Fedt- 

 schenko Spisok rasL p. 142. 



var. laurifolia ( Ldb.) Wesm. DC Prod. XVI p. 330 ; Francliel 



pi. lurk. 1. c. p, :253 ; 0. Fedtschenko I.e.; — P. laurifolia Ldb. 11. 

 all. IV p. 297; Ldb. n. ros. III p. 629; Ldb. Ic. pi. 11. Ros. t. 479. 



Pamir: N. 1339, prov. Wakhan, in cultivated land at Langarkisht. 

 All. 3000'". Sept. 10. 1898. 



Area: Xorthern America. Europe, Sibiria. Asia-Media. 



3. P. pyramidalis Pvoz.; Bois. 11. or. IV p. 1194. 

 Samarkand: N. 85, cultivated. May 3. 1898. 

 Area: Europe, western Asia. 



4. P. pruinosa Scbrenk; Ldb. fl. ros. HI, p. 628; Trautv. Enum. 

 Song. I.e. p. 91 ; Pvgl. et Herd. pi. Semenov. 1. c. p. 97; Rgl. Acta 

 H. Petrop. VI p. 474; 0. Fedtschenko Spisok rast. p. 142; Herb. 11. Ros. 

 N. 1135, 1135a et b. 



Regel (Ada H. Petrop. VI) consider P. pruinosa as a variety of the 

 following species, bul he is not right in doing so. Hitherto P. pruinosa 

 has been imperfectly described, neither of the descriptions mentioning the 

 catkins. Now, in the „Schedae ad Herbarium florae Rossicae", Mr. Lit- 

 wiuow gives the following remarks on the difference between this species 

 and P. euphratica: ,A P. euphratica differt praeter indumentum gemma- 

 rum ramulorumque juniorum et foliorum formam (quae in P. pruinosa 

 minus variabiles sunt), perigonio ad medium v. ad basin usque in dentes 

 crebriores diviso, non margine tantum dentato , sligmatibus laxioribus 

 (longius pedicellatis), antheris obtuse apiculatis, nee omnino muticis." 



Besides, the calkins of P. pruinosa often are shorter and more dense- 

 tlowered and the capsules are velutine. And having seen a series of 

 samples of both species I can add , that the variation of the leaves in 

 the two species is (piile different, P. pruinosa varying from reniform and 

 subvelutine to ovoid and densely velutine, and the glabrous P. euphratica 

 from reniform through ovoid to linear. See the figures. 



Transe asp ia: N. 192, cultivated at Tshardshui. May 5 1898; 

 — Amu Dar i a: N. 1824, on an Island („Shatman Togai*) between 

 Tshardshui and Chiwa. June 19. 1899. A tree 8™ high; N. 1825, Ibid. 

 A shridi. 1 — 2'" high. Leaves oblong-ovoid, while velutine; X. 1860. 

 Kavak-lé at the river Amu Daria, between Tshardshui and Chiwa, in 

 forests. June 23. 1899. 



Area: Middle and central Asia. 



