f 



I 



/ 



1907] CURRENT LITERATURE 



o97 



Driftwood from the arctic sea. — A large amount of driftwood has been exam- 



Jenisei River. Among 



J 



Pin us, and Abies; while the deciduous plants belong mostly to Salix, Populus, 

 and Betula. The structure of the trunks and roots is described and figured. The 

 author reaches the conclusion that the polar current is a much more important 

 factor in the transportation of driftwood in the arctic seas than Is the gulf stream. 

 The fact that seeds and fruits of various arctic plants have been found caught 

 in the fissures of driftwood leads to the conclusion that the wide distribution of 

 several arctic species may be due to such transportation. — ^Theo, Holm. 



A mutant of Leptospermum scoparium. — This shrub is very common in New 

 Zealand, occupying vast tracts of usually barren country. The flowers are 



dered with snow. 



pow 



Cockayne 



crimson flowers. This plant 



possession of by a firm of nurser\Tnen, and among 



from the seed six more plants with crimson flowers appeared. The variation 



brownish 



green. — ] 



Linnaea borealis. — Wittrock^^ has published thirteen mostly colored plates 

 of Swedish forms of this species^ and in the accompanying text has described 

 about 160 forms. The vegetative organs are mentioned, but the author has made 

 a special study of the shape and coloration of the corolla, which is beautifully 

 illustrated. The American representatives are briefly described, and the following 

 may be noted: L, borealis Ion gi flora Torr. f. anguslissima (Washington), 



f. ctitticalyx (Colorado), f. minutijolia (} 

 Theo. Holm. 



ermon 



Monograph of Fraxinus, — Lingelsheim^^ has made a general study of 



■phology 



forms 



recognizes 



species in § Ornus, nine of which are new; and thirty-two species in § Fraxinaster 



four of which are new. 

 -P. papulosa (Townsend 

 Mexico, and F, hybridc 

 J. M. C. 



jescens (Jaral 



23 Invgarson, Fr., Om Drifverden i Norra Ishafvet. 

 Hdlgr, 37:1. 1903. 



^4 Cockayne, L., On the sudden appearance of a new 

 oi Leptospermum scoparium. New Phytol. 6:43-46. 1907. 



£ 



Acta, Hort. 4: no. 7, 1907. 



^^ LiNGELSHEiM, ALEXANDER, Vorarbeiten 

 Fraxinus. Bot. Jahrb. 46:185-223. pi. 8. 1907. 



ilymorph 



i 



