150 :\lIX.\l£SOTA i;UTA.\ICAL STUDIES. 



20-30 cm. in length are estimated to range from 25-75 years in 

 age. 



4. In Syiiiplocai'l^us the season's growth begins with the un- 

 folding of two scale leaves. A variable number of renewal shoots 

 are added each year. Each renewal shoot bears two leaves 

 (either scale or foliage leaves), a spathe and an inflorescence. 



5. In Lysichiton the season's growth begins with the un- 

 folding of ordinary foliage leaves. Three to seven renewal shoots 

 are added each year. Each shoot bears two foliage leaves, two 

 long narrow colorless scale leaves, a long petioled spathe and an 

 inflorescence. 



6. In Symplocarpus the first two internodes of the renewal 

 shoot are extremely short, the third is considerably elongated, 

 12-16 cm., while the last, the one between spathe and inflorescence 

 is short. In Lysichiton not only the first two, but the three fol- 

 lowing ones are very short. The last internode of the shoot is 

 greatly elongated, measuring from 3-4 dm. 



7. Vegetative buds are regularly laid down in the axil of 

 the second foliage leaf of each renewal shoot, but they are never 

 known to develop. 



8. The leaves are all arranged according to the 5/13 phyllo- 

 taxy. The spiral may run either clockwise or counter clockwise. 



9. The number of inflorescences laid down each year is the 

 same as the number of renewal shoots {'i-7), but of this number 

 only one or two in Symplocarpus and two to four in Lysichiton 

 come to maturity. The remaining ones are blasted many months 

 before the time when they would blossom. 



10. The inflorescences can be distinguished 18-20 month-i 

 before they are to blossom out. 



11. A very elaborate system of thick contractile roots is built 

 up in each species. As many as 100-200 roots are found on 

 ordinary sized rhizomes at one time. These root§ pull the thick 

 rhizomes end first into the ground. 



12. The relationship of the Calloidcae is not a natural one 

 and Symplocarpus and Lysichiton should be separated from the 

 group on both morphological and anatomical grounds. The two 

 genera are not very closely related although they show interesting 

 similarities in growth and habit. 



13. The present geographical distribution of Symplocarpus 



