involucre

/in-vuh-loo-ker/US // ˈɪn vəˌlu kər //UK // (ˈɪnvəˌluːkə) //

涉及,包括,牵涉到,涉及到

Definitions

n.名词 noun

1
- : Botany. a collection or rosette of bracts subtending a flower cluster, umbel, or the like.
- : a covering, especially a membranous one.

Its flower-heads are surrounded by a spreading foliaceous woolly involucre, and its foliage is also of the same woolly character.
The margin is continuously recurved to form a rather broad involucre, and the very edge is somewhat thinner and whiter.
The upper part of the veinlets is covered with sporangia, which as they ripen push out from beneath the involucre.
Around and beneath each yellow cluster are two rows of thin, green, smooth scales (involucre).
This beetle ordinarily lays its eggs in the involucre of the butternut.