all the plants of a particular place or from a particular time in history

the flora of the Balearic Islands 巴利阿里群岛的植物群

Stone Age flora 石器时代植物群

all the bacteria and other organisms that live inside an animal

In the normal, healthy person the gut flora is a balanced community of different organisms. 生活在一个正常健康的人的肠道内生物群是一个平衡的群体。