93 



Nitschke (Bot. Zeit. i8 : 57. i860) described reproduction 

 by budding in plants of D. rotundifolia growing in their native 

 boes. He observed that while the bud-formation from the leaf 

 surface occurred throughout the summer it was especially frequent 

 in the fall. The buds always developed from the upper side of 

 the leaf. He compared the plant arising from the bud with the 

 seedling and noted that the bud-plant had only a stem-root 

 while the seedling had numerous roots at the base. The first 

 leaves of the bud-plant resembled the mature leaves while the 

 seedling had cotyledons each with a single stoma, and nepionic 

 leaves without glandular hairs. Both the bud-plant and the 

 seedling were caulescent during their first year's growth and 

 attained their rosette form at the beginning of the second season, 

 though bud-plants produced in spring in some cases gained the 

 rosette form during the summer. The first leaves made an acute 

 angle with the stem but the angle made by succeeding leaves 

 increased until it became 90° and the rosette form was reached. 

 Drought tended to hasten the production of the rosette form, 

 while fully developed plants placed under moss produced elon- 

 gated axes like those of their early form. 



Grout (Am. Nat. 32 : 114. 1898) noted adventitious buds on 

 the leaves of D. roUuidifolia, also the occurrence of glandular 

 hairs a short distance from the base of stems of young plants. 

 The latter observation corresponds with a statement made in 

 Nature (15 : 18. 1876) that plants of Z>. rotundifolia exhibited 

 at the Chester (England) Society of Natural Science showed 

 elongated axes which produced leaves and glandular hairs 

 alternately. 



Similar proliferation of the leaf tissues of D. intennedia was 

 recorded by Naudin (Ann. Soc. Nat. H. 14: 14. pi. i.f. 6. 

 1840). Two plants developed between the mid-vein and margin 

 of the leaf which had rosettes of leaves like those of the mature 

 plant. The lower surface of the budding leaf was perfectly intact 

 and there was no indication of a root. 



The appearance of buds upon leaves of D. longifolia was re- 

 ported by Kirschleger (Bull. Soc. de France 2 : 723. 1855). 



Winkler (Ber. d. Deutsch. Gesell. 21 : 105. 1903) noted 



