Contributions in geographical exploration . H +i April, 1U19] Beginnings of Rcvegctation 32: These lupines are, however, strictly confined to the valleyand to situations that at one time or another have Vxen over-flowed by stream waters. On the surnjunding hillsides and inother parts of the valley there are many areas that, to allappearance, offer quite as favorable habitats as those whichare occupied by lupines, but not a single plant has ever beendetected outside the flood plains except on oases of old soil. The reason for this peculiarity of distribution is not clear atthe present time. It
Contributions in geographical exploration . H +i April, 1U19] Beginnings of Rcvegctation 32: These lupines are, however, strictly confined to the valleyand to situations that at one time or another have Vxen over-flowed by stream waters. On the surnjunding hillsides and inother parts of the valley there are many areas that, to allappearance, offer quite as favorable habitats as those whichare occupied by lupines, but not a single plant has ever beendetected outside the flood plains except on oases of old soil. The reason for this peculiarity of distribution is not clear atthe present time. It may be that the Fcds are water borne. ^ ^* :»V *iCk.# *?. iitm ? Photograph by D. B. Church SEEDLINGS OF EPILOBIUM ALASKA STARTING ON PLMICEIN A SPRINGY PLACE. instead of wind disseminated. But the winds of the districtare so extremely violent, (see below, page 339). as to make itappear unlikely that objects so slight as lupine seeds wouldresist their action. Legumes in general are known to bedependent on organisms in the soil for that innoculaiion withthe tubercle bacteria upon which their success is might well be that while these organisms were absent fromthe general mass of ash they were i)resent in ash contaminatedby flood waters. 328 The Ohio Journal of Science [Vol. XIX, No. 6, Bacterial examinations of the soil in the neighborhood of thegrowing lupines, conducted by Jasper D. Sayre, have howeverfailed to indicate the presence of the tubercle bacillus in thesoil. The ash is extraordinarily poor in from numerous collections made in 1917 remainedaltogether sterile, while in
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