tumbleweed
/ˈtʌmblwiːd/noun
mass noun
1- N. Amer. & Austral. a plant of arid regions which breaks off near the ground in late summer, forming light globular masses which are tumbled about by the wind〈北美, 澳〉风滚草; 丝石竹; 苋属植物。
1.1
- Genera Salsola (family Chenopodiaceae) and Amaranthus (family Amaranthaceae).猪毛菜属（藜科）及苋属（苋科）。