76 MINNESOTA BOTANICAL STUDIES. 



SIMARUBACE.E. 

 Ailanthus glandulosa DESF. 



This well-known tree is a native of eastern Asia. It is, how- 

 ever, grown extensively in this country. The writer's observa- 

 tions on the seedlings differ somewhat from those previously 

 published.* 



The seeds, planted in May, germinated in from two to three 

 weeks. The seed coat and wing sometimes remain in the 

 ground but are quite often carried up by the elongation of the 

 hypocotyl before the cotyledons emerge. 



The cotyledons are at first about 6 mm. long. By the time 

 they are fully open they have increased somewhat in size and 

 the hypocotyl has attained its full length, viz. about 40 mm. 

 When the first leaves have opened the cotyledons are broadly 

 obovate, petiolate, with the blade 15 mm. long, n mm. broad 

 and the petiole 5 mm. long. 



The epicotyl is at length 20 mm. long. The first few leaves 

 are trifoliate. Later leaves are pinnate. 



ANACARDIACE^:. 

 Schinus molle LINN. 



This is the so-called "pepper-tree" sometimes planted in 

 California but a native of tropical America. A description of 

 the germination of the seed is given by Lubbock,f whose ac- 

 count in this case, the present writer only desires to supplement. 



The cotyledons are remarkable for their great increase in 

 size ; beginning with a length of 5 mm. the blade is finally 20 

 -25 mm. long and broad in proportion. The petiole is about 

 4 mm. in length. 



CELASTRACE^E. 

 Celastrus scandens LINN. 



This is the " climbing bitter-sweet, T a common native liana 

 of the United States. It is frequently cultivated. The seeds 

 ripen in the fall. If planted the following spring they usually 

 require a year to germinate. 



The cotyledons are thin, reticulately veined, petiolate, oval- 

 oblong in shape. At first they are 10 mm. long and 5 mm. 



*Lubbock op. cit. i : 327. 

 |Op. cit. 2: 335. 



