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Genus Tanacetum
- a large genus of plants resembling chrysanthemums; comprises some plants often included in other genera especially genus Chrysanthemum
Genus Taraxacum
- an asterid dicot genus of the family Compositae including dandelions
Genus Tetraneuris
- genus of hairy yellow-flowered plants of the western United States
Genus Tithonia
- genus of robust herbs of Mexico and Central America: Mexican sunflower
Genus Townsendia
- genus of western American low tufted herbs: Easter daisy
Genus Tragopogon
- genus of Old World herbs with linear entire leaves and yellow or purple flower heads
Genus Trilisa
- genus of herbs of southern United States
Genus Tripleurospermum
- small genus comprising plants often included in genus Matricaria
Genus Tussilago
- genus of low creeping yellow-flowered perennial herbs of north temperate regions: coltsfoots; in some classifications includes species often placed in other genera especially Homogyne and Petasites