What is "capitellate"

Capitellate \Cap`i*tel"late\ (k[a^]p`[i^]*t[e^]l"l[asl]t), a. [L. capitellum, dim. of caput head.] (Bot.) Having a very small knoblike termination, or collected into minute capitula. [1913 Webster] ||

a. (context botany English) Having a very small knob-like termination, or collected into minute capitula.