314 Floristik, Geographie, Systematik etc. 



The distinction marks between Oe. aqiiatica and Oe. ßuviatüis 

 are discussed. It is shown that sometimes also Oe. aquat. produces 

 propagation shoots, thus being a perennial plant — at least when 

 growing in water. But more detailed studies on the manner of pro- 

 ducing these shoots are necessary. 



It is supposed that, the records in several floras of Central- 

 Europe. of runners in Oe. aquat. are to be explained by theircom- 

 bining Oe. aquat. with Oe. ßuv. into one species. Further researches 

 will probably succeed in finding Oe. ßuv. in the countries between 

 Jutland and Baden. A closely related plant, Oe. conioides (Nolte 

 ms.) Lange, only known from the Elbe around Hamburg, may 

 perhaps be the land-stage of Oe. ßuv., as its characters agree with 

 it; but it is remarkable that it has not been found with submerged 

 leaves. The authors abstract. 



Petrie, D., Descriptions of new species and varieties of 

 native Phanerogams. (Trans. New Zeal. Inst. XLV. p. 265—275. 

 1913.) 



Ranunculus Baughani, Epilobium arcuatum, Olearia Willcoxii, 

 Celntisia intermedia, Helichrysum Grahami, Raoulia cinerea, Myosu- 

 tis Cockayniana, Gentiana tenuifolia, Convolvulus fractosaxosa, Vero- 

 nica Willcoxii, V. Grahami, Poa Cockayniana and P. Guthrie-Smithiana. 



M. L. Green (Kew). 



Porsild, M. F., Vascular Plants of West Greenland be- 

 tween 7P and 7 3° N. Lat. (Meddelelser om Grönland. L. p. 

 349—389. Köbenhavn. 1912.) 



The author, the director of the Danish Arctic Station on Disco, 

 has made a journey in the summer of 1911 from Disco northwards 

 to the neighbourhood of Pröven and the northern district of 

 Umanak. In the present paper he gives an account of this journey 

 and describes the Vegetation of this part of West Greenland (Lat. 

 71°— 73° N.). At the head of Lakse Fjord (Lat. 72° 30' N.) he found 

 a well developed willow-copse {Salix glauca), probably the most 

 northerly true copse in West Greenland. Otherwise the plant 

 communities do not present much of special interest, they resemble 

 the communities known from other parts of the northern West 

 Greenland. 



In a list 148 species are enumerated and the vascular plants 

 are supposed to be 152 in number. The chief results of a phytogeo- 

 graphical statistic of the distribution of these species are the fol- 

 lowing: 



1) Many species, the northern limit of which was hitherto 

 supposed to lie between Lat. b9° and 71° N., in reality occur further 

 north between Lat. 71° and 73°. On the other hand of the species 

 {Archangelica and its attendants) peculiar to the southern part of 

 Disco, none has been found further towards the north. 



2) A decidedly southern towards hemiarctic dement is found 

 in the flora even as far north as Lat. 71°— 73°; more particularly — 

 but not exclusively — Inland around the head of the fjords where 

 the climatic conditions are more favourable. 



3) While the hemiarctic element in the district in question still 

 constitutes about 1/3 of the flora, it forms on Hare Island only Vj' 

 in spite of the more southern Situation of the latter. The reason 



