No. 2, Junes, 1921] ECOLOGY, PLANT GEOGRAPHY 141 



976. Roll, J. t)T)er Sphagnum riparium Ang. und iiber seine Verbreitung im hercynischen 

 Florengebiet. [Concerning Sphagnum riparium and its distribution in the Hercynic Flora.] 

 Hedwigia 61: 176-182. 1919. — The stations for Sphagnum ripariurn in the Hercynic flora 

 are recorded, together with notes on ecological factors. Apparently there are many ecological 

 variations. In dry localities the moss is only a few centimeters high; leaves and branches 

 are very crowded. The stem leaves vary very little but the branch leaves assume various 

 forms, depending on the location. — Ernst Artschwager. 



977. S.\MUELSsoN, GuNNAR. Anteckuingar frdn Tornetrask-omradet. [Notes from the 

 region of Tornetrask (a lake in Lappland, Sweden).] Bot. Notiser 1920: 51-61. 1920.— The 

 author gives a general description of the arctic-alpine vegetation, gives lists of plants of 3 

 different formations, and a list of localities of nearly 150 species which had been found at 

 altitudes not strictly belonging to their altitudinal ranges. — P. A . Rydberg. 



978. Standley, Paul C. Stachys lanata in Ontario. Rhodora 22: 128. 1920.— The 

 author reports the occurrence of this species near Owen Sound, Ontario. Although the 

 literature has not been searched thoroughly he thinks that perhaps this plant, which is native 

 of the Caucasus region, has not been reported previously from North America. — James P. 

 Poole. 



979. Stevens, O. A. The geographical distribution of North Dakota plants. Amer. 

 Jour. Bot. 7:231-242. 1 fig. 1920.— The vascular plants of the North Dakota flora may be 

 divided into 6 main groups: (1) Those which are essentially eastern in their distribution and 

 reach only the eastern part of the state; (2) those which are eastern but extend to the western 

 part of the state; (3) those which are essentially western and reach only the western part of 

 the state; (4) those which are western but extend to the eastern part of the state; (5) cosmo- 

 politan plants; and (6) introduced plants. Characteristic members of these groups are 

 enumerated and discussed. — The state lies almost wholly within the Transition life zone. 

 The few members of its flora which belong to the Canadian zone or to the Upper Austral 

 zone are enumerated. The plants which are common to North Dakota and to New Mexico 

 are studied as to their comparative distribution in the 2 states with reference to life zones. — 

 Some sand dune species, some introduced ones, and certain others of particular interest are 

 discussed. — E. W. Sinnott. 



980. Thompson, H. Stuart. Habitats of Hypericum humifusum. Jour. Botany 57: 

 195-196, 225-226. 1919.— This plant was found in the turf of woodland paths over limestone 

 in northern Somerset County. In most of the texts it is said to occifr in places which would 

 indicate a gravelly, sandy, or heathy acid soil. A later observation has shown the plant 

 chiefly confined in Cornwall and Devonshire to mossy crevices in stone walls and dry hedge 

 banks by roadsides on granite and slate. It was found only twice on heaths or commons. 

 One or two plants only occur in a place. The author believes that the distribution has been 

 much influenced by man. Brief notes on the soil preference of Juncus tenuis and Erodium 

 maritimum. are given. — K. M. Wiegand. , 



981. Thomson, Geo. M. Naturalization of animals and plants. New Zealand Jour. Sci. 

 and Tech. 1: 192. 1918. 



982. VoGG, L. Aussterbende Pflanzen. [Plants becoming extinct.] Ber. Naturw. 

 Verein Schwaben u. Neuburg 42: 184-186. 1919.— Attention is called to the threatened dis- 

 appearance of certain species in the vicinity of Kutzenhausen, Bavaria, owing to the spread 

 of cultivation. A few of the species listed grow on a railway embankment, a few others are 

 found in a moist forest meadow, but the majority are inhabitants of boggy meadows. In 

 addition to the plants on the eve of extinction the accompanying species are likewise enu- 

 merated. — A. W. Evans. 



