94 TENDBIL-BEABBRS. Chap. UL 



fully described under B. eapreolata, I will here say 

 nothing more about them. 



Bignonia sequinoetialis, var. O^amterZo^Mi.^-The 

 internodes, the elongated non-sensitive petioles, and 

 the tendrils all revolve. The stem does not twine, 

 but ascends a vertical stick in the same manner as 

 the last species. The tendrils also resemble those of 

 the last species, but are shorter; the three toes are 

 more unequal in length, the two outer ones being 

 about one-third shorter and rather thinner than the 

 middle toe ; but they vary in this respect. They 

 terminate in small hard points; and what is important, 

 cellular adhesive discs are not developed. The re- 

 duced size of two of the toes as well as their lessened 

 sensitiveness, seem to indicate a tendency to abortion ; 

 and on one of my plants the first-formed tendrils were 

 sometimes simple, that is, were not divided into three 

 toes. We are thus naturally led to the three following 

 species with undivided tendrils : — 



Bignonia spedosa.- — The young shoots revolve irregu- 

 larly, making narrow ellipses, spires or circles, at rates 

 varying from 3 hrs. 30 m. to 4 hrs. 40 m. ; but they 

 show no tendency to twine. Whilst the plant is 

 young and does not require a support, tendrils are 

 not developed. Those borne by a moderately young 

 plant were five inches in Ibngth. They revolve spon- 

 taneously, as do the short and non-sensitive petioles. 

 When rubbed, they slowly bend to the rubbed side 

 and subsequently straighten themselves ; but they are 

 not highly sensitive. There is something strange in 



