342 A. Gray— Aistivation and its Terminology. 
importance, notwithstanding the occasional passage of the one 
into the other. He must have also observed that in many 
cases, as in Asclepias for instance, the mode II passes into 
III. valvata. The first and the third are established beyond 
question, although somewhat remains to be said about the first. 
eanwhile another use has prevailed as respects the 
second. In DeCandolle’s Prodromus, the first general or con- 
siderable work after Brown in which terms of estivation are 
employed, this mode is almost uniformly characterized as 
convolution, that the term convolute is now and then assigt 
in the romus; as in the character of Byttneriacee, and that 
of Malvaviscus. The latter may perhaps be explained by the 
thesis. But 
. 
mus. In the new Genera Plantarum by Bentham = 
Hooker this mode is most commonly designated as contor4, 
