求有关“杂草”的相关词汇 [详细的可追加50分]

Description
Bromus species occur in many habitats in temperate regions of the world, including the Americas, Eurasia, Australia, and Africa. There is a wide variety between some species, while the morphological differences between others are subtle and difficult to distinguish. As such, the taxonomy of the genus is complicated.

The genus Bromus is distinguished from other grass genera by the combination of several morphological characteristics, including leaf sheaths that are closed (connate) for most of their length, awns that are usually inserted subapically, and hairy appendages on the ovary. The leaves and sheaths can be hairless, sparsely hairy or hairy. The inflorescence is a loose or open panicle, usually drooping or nodding, sometimes spreading (as in Japanese Brome, B. japonicus).

Ecology
The caterpillars of some Lepidoptera use Bromus as a foodplant, e.g. the Chequered Skipper (Carterocephalus palaemon).

Bromus species are general