ril.VXEtlOGAMIA. 101 



Hogg, John. — Note on the Tree Mallow. — Jour. Proc. Linn. Soc. (Bot.), 

 vol. v., pp. 51-2. 



A specimen grown in the north of England from seeds collected 

 in the south of Ireland, and sown in April, 1858, was killed by the 

 frost of December, 1859. "When cut down, the stem measured 2| 

 inches in diameter, exclusive of the bark. Mr. Hogg directs at- 

 tention to the value of the fibre of the bark, and the importance of 

 the cultivation of the Lavatera on its account. 



Hooker, J. D. — Note sur l'origine et le developpement des umes dans 

 les plantes du genre Nepenthes. Jour. Trans. Linn. Soc, London, 

 1859.— Ann. Sc Nat. (Bot.). Ser. iv., torn, xii., pp. 222-31. 



On Fropiera. A new Mauritian genus of Calycifioral Exo- 



gens, of doubtful affinity. — Jour. Proc. Linn. Soc, vol. v., pp. 1, 2, 

 with 1 plate. 



Founded upon specimens collected in the Mauritius by Sieber, 

 M. Bouton, and others. In habit Fropiera resembles some IlicineaB ; 

 but its glandular, entire leaves, with closely parallel, and also intra- 

 marginal veins, indicate a relationship with Myrtacese, of which 

 order Dr. Hooker is disposed to regard it as an anomalous ally. 



On Barteria. A new genus of Passhiorea3, from the Niger 



River. — Jour. Proc Linn. Soc, vol. v. (Bot.), pp. 14-5. 



A remarkable and anomalous addition to Passiflorese, collected by 

 the late Mr. Barter. The stigmas are consolidated into an indis- 

 tinctly-lobed, capitate mass, exceeding the ovary in diameter. The 

 stamens are numerous, and bi- serial. 



(The following is a brief notice of a paper read by Dr. J. 



D. Hooker before the Linnean Society, 21st June, 1860, on the 

 Distribution and Affinities of North Polar Vegetation. This paper 

 will appear in the "Transactions of the Linnean Society of London.") 



The Arctic Flora is comprised within a belt of 10° to 14° latitude, 

 N., of the Arctic circle. The number of Phanerogamia hitherto col- 

 lected within this belt amounts to 806 (Monocotyledons, 218, Dico- 

 tyledons, 588). Cryptogams may be approximately estimated at a 

 little over 900. The predominating type in Arctic vegetation is the 

 Scandinavian : Arctic Scandinavia alone containing three-fourths of 

 the species. The Asiatic and American types are very subordinate. 

 The general character of the vegetation is continuous in longitude, 

 without abrupt break, excepting in the meridian of Baffin's Bay,, 

 where the contrast between the almost purely European Flora of the 

 east coast, and the American element of the west, is very marked. 



Dr. Hooker divides the region of the Arctic Flora into five pro- 

 vinces, viz. : — 



Proportion of 

 Scandinavian species. 



Arctic Europe (extending east to the Obi), 

 containing (about) 607 species, 

 „ Asia, „ 218 



,, West America, ,, 349 ,, 



„ East, „ 359 



,, Greenland, ,, 192 ,, 



