T. Holm — Erigenia bullosa. 



65 



the ground (fig. 3) and shows a small, ternately decompound 

 blade with divisions of the same shape as those of mature 

 leaves. This leaf has during the winter been surrounded by a 

 small, membranaceous, scale-like leaf, which is still to be seen 

 at this stage, but is, however, mostly decayed and not plainly 

 visible. The tuber has increased in thickness, and the filiform 

 part of the root below the tuber has died off altogether. A 

 few (three or four) lateral roots, all filiform, have developed 



Fig. l. 

 root. 

 Fig. 2. 

 Fig. 3. 



Seedling of Erigenia bulbosa Nutt. ; natural size. "R = the primary 



Blade of the cotyledon , enlarged. 



Young plant in its second year ; natural size. The filiform portion of 

 the primary root has faded away, and four lateral roots have developed from the 

 tuberous part. A small scale-like leaf is to be seen at the base of the petiole of 

 the green leaf. 



Fig. 4. Young plant in its third year ; natural size. The dotted lines indicate 

 the surface of the soil. 



from the sides of the tuber, but otherwise the plant does not 

 show much progress in growth since the first year. The third 

 year's growth is not much advanced either (tig. 4), as only one 

 green leaf is developed, though with a few additional divisions 

 of the blade, and we find, also, at this stage a small scale-like 

 leaf at the base of the larger, which has, thus, served as bud- 

 scale during the winter. The tuber has only grown very little, 

 retaining its globular shape and brown color, but no additional 

 Am. Jour. Sci. — Fourth Series, Vol. XI, No. 1.— January, 1901. 



