148 FLORA OF MOUNT DESERT. 496 P. grandidentata, Mx. LARGE-TOOTHED ASPEN. C. K. Frequent in woods. 497 P. balsamifera, L. BALM OF GILEAD. Frequent about dwellings, etc. Apparently introduced, and naturalized by seedlings. Oak Hill, etc. (Rand);— Southwest Harbor (Elizabeth G. Britton, Rand);—Seal Harbor (Redfield);—and elsewhere. At Somesville, however, and east of Town Hill, remote from dwellings, it appears to be indigenous. 498 P. DILATATA, L. LOMBARDY POPULAR. Occasionally by roadsides, etc., and sometimes spontaneous, Somesville; Southwest Harbor (Rand);—Oak Hill (Redfield). Adventive from Europe. EMPETRACEÆ. CROWBERRY FAMILY. EMPETRUM, L. CROWBERRY. 499 E. nigrum, L. BLACK CROWBERRY. Common on cliffs along the coast and on the islands. Often in heaths and bogs; The Heath, Great Cranberry Isle; Sunken Heath; Great Heath (Rand);—more rarely on mountains and hills; Barr Hill; Green Mt. (Redfield);—Sargent Mt. (Rand). Also Duck Islands (Redfield). COREMA, Don. BROOM CROWBERRY. 500 C. Conradii, Torr. Dry rocky places; rare and local. Asticou; Little Harbor (Lane & Rand);—Barr Hill, in a number of localities; hill between Long Pond and Little Harbor Brook (Redfield);— Beech Mt.; Dog Mt. (Rand);—Beech Hill (Annie S. Downs, Sara E. Boggs);—Ship Harbor (Annie S. Downs);—in great abundance in pine barrens, east of Ship Harbor; west of Hio (Rand).* * Corema also grows in abundance with Pinus Banksiana, near Prospect Harbor, Gouldsborough (Redfield).