quercus

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quer·cus

(kwer'kŭs),
The bark of Quercus alba, white oak or stone oak; formerly used as an astringent.
[L. oak]

Quercus

plants of the northern temperate zone in the family Fagaceae; oaks; vary from shrubs to great trees. Leaves and acorns are poisonous because of their content of gallotannins. Poisoning is manifested by abdominal pain, thirst, frequent urination, ventral edema and lesions of gastritis and nephritis. Toxic species include Q. aliena, Q. breviloba (Q. durandii), Q. coccinea, Q. cutissima, Q. dentata, Q. douglesii, Q. gambelii, Q. garyanna, Q. glandulifera var. acuteserrata, Q. havardii (shin oak), Q. incana, Q. lobata, Q. marilandica, Q. petraea, Q. prinus, Q. robur (Q. pedunculata), Q. rubra var. borealis, Q. stellata (post oak), Q. variabilis, Q. velutina.