70 WILD MEDICINAL PLANTS OF THE UNITED STATES. 



Thimbles. Ree Digitalis purpurea. 

 Thimbleweed. See Rudbeckia lariniata. 

 Thistle, bitter. See Cvicns hened ictus. 

 Thistle, ble.ssed. See Cnicus benedictm. 

 Thistle, ( -anada. See Carduus arrnisi.'<. 

 Thistle, creeping. See Cardans arcensis. 

 Thistle, cursed. See Carduus arvensis. 

 Thistle, holy. See Cnicus benedictus. 

 Thistle, St. Benedict's-. See Cnicus licnedictus. 

 Thistle, spotted. See Cnicus benedictus. 

 Thorn-apple. See Datura stramrmiinu. 

 Thoroughwort. See Eupatorium pcrfoliatinn. 

 Thousandleaf. See Achillea millefoHinu. 

 Throwwort. See Leonurus curdiacu. 



Thuja occidentalis L. Pine family (Pinaceae). 



Arbor-vitae; white cedar; yellow cedar. 

 Indigenous, evergreen tree, 20 to 50 feet in height; in wet S()il and along banks 



of streams, Canada to North Carolina, Illinois, and Minnesota. E.specially 



abundant in Canada and the Northern States. 



Parts used. — Branchlets and leaves (nonofficial). 

 Tiarella cordifolia L. Saxifrage family (Saxifragaceae). 



Cool wort; false miterwort; foaniHower; gemfruit. 



Slender, indigenous perennial, 6 to 12 inches high, found in rich, moist woods, 

 Nova Scotia to Minnesota, south, especially along the mountains, to ( Jeorgia 

 and Indiana. 



Part used. — Herb (nonofficial). 

 Tickweed. See Hedeoma pulegioides. 



Tilia americana L. Linden family (Tiliaceae). 



Synonym. — Tilia glabra Vent. 

 Basswood; American linden; whitewood. 



Large, indigenous forest tree, 60 to 125 feet in height; in rich woods, especially 

 along the mountains, from Canada to Georgia, west to Texas and Nebraska. 



Part used. — Inflorescence of this and of other species of Tilia (nonofficial). 

 Tilia glabra Vent. Same as Tilia americana. 

 Tinker' s-weed. See Triosteum perfoliatum. 

 Tobacco, Indian. See Lobelia inflata. 



Toothache-tree. See Fagara clava-herculis and Xanthoxylum americanum. 

 Touch-me-not, pale. See Impatiens aurea. 

 Touch-me-not, spotted. See Impatiens biflora. 

 Toywort. See Barsa bursa-pastoris. 

 Tree-primrose. See Oenothera biennis. 

 Trefoil, marsh-. See Menyanthes trifoliata. 

 Trefoil, shrubby. See Ptelea trifoliata. 

 Trefoil, sour. See Oxalis acetosella. 



Trifolium pratense L. ' Pea family (Fabaceae). 



Red clover; meadow-clover; purple clover. 



Perennial herb, 6 inches to 2 feet high; common in fields and meadows through- 

 out the eastern United States; naturalized from Europe, and widely cultivated. 

 Part Msed,— Blossoms (nonofficial). 



