from the ground, Hdt. 2.125, 4.172, Eup. 146b, Ar. V. 249, the Attic form, acc. to A.D. Adv. 187.7 (who also gives χαμαῖθεν which is found in Plu. Aet.Gr. 2.296e; χαμάθεν [ᾰ] is v.l. in Hdt. 2.125).
χαμόθεν is found in Cratin. 296, X. HG 7.2.7, Stesich. ap. Arist. Rh. 1395a2, Plu. Alex. 35, Luc. Ind. 9, and was the colloquial form acc. to A.D. Adv. 188.33.