Asteraceae

Asteraceae is a large family of flowering plants whose apparent flowers are heads made of many small florets. Its members include daisies, sunflowers, asters, and chrysanthemums.

Capitulum: A compact flower head in which many small flowers are arranged on a shared receptacle. Asteraceae flower heads are capitula, the family’s defining structural feature.
Pollination: The transfer of pollen to a plant’s reproductive structures, enabling fertilization. A head’s many florets can attract pollinators while presenting numerous reproductive units.
Helianthus annuus: The sunflower species cultivated for edible seeds, oil, and ornamental use. Sunflower is one of the family’s most economically important crops.
Asterales: An order of flowering plants that includes Asteraceae and several related families. Asteraceae is the largest family within this order.
Apiaceae: A flowering-plant family that includes carrots, parsley, and other plants with often compound umbels. Its clustered umbels can resemble flower heads, but their flowers arise from branched stalks.
Floret: A small individual flower, often part of a larger inflorescence. Each Asteraceae capitulum consists of multiple florets.
Self-incompatibility: A genetic mechanism that prevents fertilization by pollen from the same plant or a genetically similar plant. Some Asteraceae use it to promote cross-pollination and maintain genetic diversity.
Lactuca sativa: The lettuce species cultivated worldwide as a leafy vegetable. Lettuce shows the family’s importance as a source of food crops.
Angiosperms: Flowering plants that produce seeds enclosed within fruits. Asteraceae is a highly diverse lineage within the flowering plants.
Dipsacaceae: A plant family that includes teasels and scabious, with flowers grouped into dense heads. Its head-like inflorescences resemble Asteraceae capitula but have a different floral structure.

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