76 WILD MEDICINAL PLANTS OF THE UNITED STATES. 



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Wood-sorrel, white. See Qxalia acetopelia. 

 Wood-violet. See Viola pedata. 

 Worm-grans. See Spigelia marilandica, 



Wormseed. See Chenopodium anthchninticani. 

 Wormseed, American. See Chenopodium omhrosioides. 



Wormwood. See Artemisia absinthium. 



Wormwood, Roman. See Ambrosia artemisiaefolia. 



Xanthium spinosum L. Ragweed family (Ambrosiaceae). 



Spiny clotbur; spiny burseed; thorny clotweed; thorny burweed. 



An annual weed, 1 to 3 feet high, naturalized from Europe or Asia; in waste 

 ground, Ontario to Florida, westward to Missouri and Texas. 



Part wed. — Leaves (nonofficial). 



Xanthorrhiza apiifolia L'Her. Crowfoot family (Ranunculaceae). 



Shrub yellowroot; southern yellowroot. 



Low, shrubby, indigenous perennial, 1 to 2 feet high, growing in woods and 

 along river banks, southwestern New York to Florida, chiefly in the moun- 

 tains. 



J'urts used. — Rhizome and roots (nonofficial). 

 Xanthoxylum. See Fagara dava-herculi& and Xantho than americamtm. 



Xanthoxylum americanum Mill. Rue family (Rutaceae). 



Synonym* — Xanthoxylum frax'nieum Willd. 

 Xanthoxylum; northern prickly ash; toothache-tree. 



Indigenous shrub or small tree, maximum height about 25 feet; common in 

 woods and thickets and along river banks from Virginia, Missouri, and 

 Nebraska northward to Canada. 



Parts \used. — Bark of this or of Fagara clara-herm/i* official under the name 

 "Xanthoxylum." Berries (nonofficial). 



Xanthoxylum ctova-hercnlis L. Same as Fagara c/ara-herculis. 



Xanthoxylum fraxineum Willd. Same as Xanthoxylum americanum. 



Yam, wild. See Diotcorea villosa. 



Yarrow. See Achillea millefolium. 



Yellowroot. See CopHs frifo/io, Hydrastis canadensis, and Jeffersonia diphylla. 



Yellowroot, shrub. See Xanthorrhiza apiifolia. 



Yellowroot, southern. See Xanthorrhiza apiifolia. 



Yellowthorn. See Fagara ckwa-herculis. 



Yellow wood. See Fagara clava-hercuRs. 



Yerba buena. See Micromeria chaiaissonis. 



Yerba reuma. See Frankruia grandifolia. 



Yerba santa. See Eriodictyon ot/ifornicum. 



Youthwort. See Drosera rotundifolia and HeraHeum lanatum. 



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