71 



Platanus heerii, Lesqx., Hay den's Report, 1871, p. 303. 



Leaves large, 10 to 14 centimeters long and about as wide, coriaceous, 

 smooth, palmately three-lobed ; lobes short and obtuse; borders undulately 

 broadly deltoid from the lateral lobes upward, broadly cuneate to the base, 

 turning to the petiole, and descending along it about one and a half centimeters 

 lower than the primary divisions of the nerves ; lateral primary nerves more 

 or less oblique, branching ; inferior lateral veins either thin, marginal, simple, or, 

 as in Fig. 2, thicker, and anastomosing by branches and nervilles, with a mar- 

 ginal undulate vein underneath. This last character is not abnormal ; ii is 

 marked in leaves of our P. occidentalis, when the borders of the leaves are 

 entire at the base, and when the lowest basilar veins follow the borders in 

 curving and in anastomosing with divisions of an upper branch ; it is seen 

 also in P. aceroides and still more in P. guillelmce. — The leaf (PI. viii, Fig. 4) 

 has a somewhat different facies from the two figured, (PI. ix.) Its surface is 

 more polished, though its substance is of the same thickness, and the secondary 

 veins are less distant from the primary ones. This, howevei - , is a difference 

 of little moment, for a species whose nervation is so variable, as indicated by 

 the two last quoted figures, the one of which (Fig. 1) has a thick secondary 

 vein in an abnormal position, under a thick vein of the same order, and the 

 other (Fig. 2) has two thick inferior veins under the fork of the primary ones. 



Habitat.- — Bluffs on the Salina River, eight miles above its mouth. 



Platanus affinis, Lesqx., PI. iv, Fig. 4. 



Leaf subcoriaceous, round-hexagonal in outline, rounded to the petiole, narrowed in a broad angle 

 to a short point; borders undulate, distantly dentate ; nervation pinnate, craspedodrome. 



Populitcs affinis, Lesqx., Hayden's Report, 1872, p. 423. 



The leaf is 9 centimeters broad, and a little longer, round, somewhat hex- 

 agonal ; the upper borders joining in a broad angle to a short point ; the sides 

 nearly parallel ; and the lower part rounded to the petiole. By its form and 

 nervation, the leaf is related to that of Platanus heerii, (PI. viii, Fig. 4,) and also 

 in some degree at least to the leaf described as Sassafras harkerianum, (PI. 

 xi, Fig. 3.) In some points, indeed, the leaves described in these genera are 

 like transitional forms, referable as well to one as to the other. 



Habitat. — Salina Valley, eight miles above the station. 



Platanus recuevata, Lesqx., PI. x, Figs. 3, 4, 5. 



Leaves 3-5 palmately lobed ; lobes nearly equal; borders uudulate ; lateral nerves curved outside, 

 forking near the base. 



