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During the next spring or summer, the stem of the biennial plant elongates greatly, or "bolts". [4] The plant then flowers, producing fruits and seeds before it finally dies. There are far fewer biennials than either perennial plants or annual plants. [5]
Biennial plants are a small group of plants whose life cycle normally lasts two years. This list also includes those perennials which are frequently treated as biennials, for reasons of climate or aesthetics.
Campanula americana, the American bellflower, [3] or tall bellflower, [4] is a bellflower native to eastern North America.Tall bellflowers can be annual or biennial with a varying life-history with seeds germinating in the fall producing annual plants and spring-germinating seeds producing biennial plants.
The Flora of North America North of Mexico (usually referred to as FNA) is a multivolume work describing the native plants and naturalized plants of North America, including the United States, Canada, St. Pierre and Miquelon, and Greenland. It includes bryophytes and vascular plants.
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About 3,800 additional non-native species of vascular plants are recorded as established outside of cultivation in the U.S., as well as a much smaller number of non-native non-vascular plants and plant relatives. The United States possesses one of the most diverse temperate floras in the world, comparable only to that of China.
Erigeron floribundus is an annual/biennial plant native to South America to Mexico and introduced to many parts of the world. Its common names include tall fleabane, Bilbao's fleabane, and many-flowered fleabane. [citation needed]
Poa annua, or annual meadow grass (known in America more commonly as annual bluegrass or simply poa), is a widespread low-growing turfgrass in temperate climates. Notwithstanding the reference to annual plant in its name, perennial bio-types do exist. [2] This grass originated as a hybrid between Poa supina and Poa infirma. [3]