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adjectivehaving a life cycle lasting two seasons
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adjectiveoccurring every second year
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noun(botany) a plant having a life cycle that normally takes two seasons from germination to death to complete; flowering biennials usually bloom and fruit in the second seasontype of:
Definition that contains biennial
- beet biennial Eurasian plant usually having a swollen edible root; widely cultivated as a food crop
- erysimum asperum biennial or short-lived perennial prairie rocket having orange-yellow flowers; western North America to Minnesota and Kansas; sometimes placed in genus Cheiranthus
- white melilot biennial plant; valuable honey plant
- hesperis biennial or perennial erect herbs having nocturnally fragrant flowers
- onopordum acanthium biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America
- chinese forget-me-not biennial east Asian herb grown for its usually bright blue flowers
- madnep biennial weed in Europe and America having large pinnate leaves and yellow flowers and a bitter and somewhat poisonous root; the ancestor of cultivated parsnip
- genus angelica biennial or perennial herbs of the northern hemisphere; have a taproot
- red bird's eye biennial European catchfly having red or pink flowers; sometimes placed in genus Lychnis
- blazing star biennial of southwestern United States having white stems and toothed leaves that is grown for its large pale yellow flowers that open in early morning