82 



demonstration is given of the influence of surroundings and ex- 

 posure on plants. Each group has of course a sunny and shaded 

 side, a dry and a humid surface ; and a notable and striking dis- 

 tinction is established between the vegetation of the north and 

 south side of the same hillside. On the south side with fullest 

 exposure to the sun and drought are established the xerophilous 

 plants, Potentillas, pinks, Geraniaceae, Artemisia Pedemontana, 

 Achillea argentea, as well as most all of the labiates. On the 

 north side are the hygrophylous plants, Saxifrages, Rhododen- 

 dron, Mimnlus, various Silenes, Valeriana Celtic a, etc. 



It is thus shown in these few notes that the garden is not 

 only a collection of alpine plants but also of alpine conditions 

 gathered into a small space and easily accessible for study. Not 

 the least interesting and valuable collection and certainly a 

 unique one in its way, is that of the mosses. The region is 

 bryologically a remarkably rich one, and the project has been 

 formed by the Director, Professor Wilczek, and the distinguished 

 bryologist M. Jules Amann, to list the species of mosses grow- 

 ing on the rocks, which after numbering the rocks, will establish 

 a catalogue of the mosses of the valley. On many of the boul- 

 ders as many as forty species have been enumerated. 



A. M. V. 



SHORTER NOTES. 



TULIPA SYLVESTRIS IN THE FLORA OF THE UNITED STATES. 



On May 6th, while driving along a thicket in a rich ravine near 

 Sellersville, Pa., I discovered the Tulipa sylvestris L. growing in 

 considerable abundance. Later it was found in the meadows a 

 mile up the stream. Upon inquiry it was ascertained that it had 

 been growing there for at least five years. 



At the same time it was reported from Lansdale, Pa., a point 

 ten miles from the first mentioned locality. Here it was found in 

 a meadow, from which it had spread into an adjoining truck-patch, 

 and thence into a wooded ravine. 



It is thoroughly established in both localities, and should be 

 included in the flora of the United States. — C. D. Fretz, M.D. 



