=Populus balsamífera= Linnæus. Balsam Poplar. This species was reported by Bradner for Steuben County. In a letter from the late Prof. Bradner, he said he had no specimen and had no recollection of the tree. J. M. Coulter reported it for Jefferson County, but Young who also wrote a flora of Jefferson County does not mention it. Baird and Taylor also reported it for Clark County. The last two records may have been from cultivated trees or mistaken for _Populus grandidentata_ which was not reported and is in the area, and is a frequent tree in the "knobs" in Clark County. Heimlich reports it in Proc. Ind. Acad. Sci. 1917:404:1918 for Cowles. I regard this as an error. See discussion under _Abies canadensis_ on page 290. Since the range of the species is to the north of Indiana, it is here proposed to drop it from our flora. It should be looked for on the "divide" in Steuben County and about Lake Michigan. =Populus cándicans= Aiton. Balm of Gilead. This species has been included in a few local floras, but it is believed that it has not yet escaped from cultivation. Phinney[79] gives it as "an important timber tree of Delaware County," which is an error. =Populus nìgra= var. =itálica= Du Roi. Lombardy Poplar. Reference is made to this tree by Blatchley[80], Meyncke[81] and Nieuwland[82] but it is scarcely more than an accidental escape. =Carya aquática= Nuttall. Water Hickory. This species is listed as one of the principal trees occurring along the Wabash in the Coblenz edition of Prince Maximilan's travels in North America. It is recorded as "Water Bitternut (_Juglans aquatica_)." If it occurs in our area it most likely would be found in the extreme southwestern counties. It has been reported from Gallatin County, Illinois, bordering Posey County on the west. There are two other records of its occurrence in the State, which are doubtful. Ryland T. Brown[83] reported it in a list of the principal trees of Fountain County in a report of the geology of Fountain County. _Carya laciniosa_, which is sometimes called swamp hickory and which is more or less frequent in the county, he failed to report. It is believed this reference to _Carya aquatica_ should be referred to _laciniosa_. B. C. Hobbs also reported it as common in Parke County in a short list of the principal trees. He named only four of the five or more species of hickory that occur in the county, and it is believed since he was no botanist, that he confused the names. Elliott in his Trees of Indiana gives "_Carya aquatica_" as common, but no doubt this reference should be transferred to some other species. =Carya myristicæfórmis= Nuttall. Nutmeg Hickory. This tree also was reported by Prince Maximilian as occurring along the Wabash River. The known range of the species is from North Carolina to Arkansas, and for this reason the species is not included in this list.