230 BOTANICAL GAZETTE . [march 



Platanus occidentalis var. glabrata, n, var. — P. racemosa 

 Hemsley, Bot. Biol. Am. Cent. 3:162 (not Nuttall). 1882.— P. 

 glabrata Fernald, Proc. Am. Acad. 36:493. 1901. — P. densicoma 

 Dode, Bull. Soc. Dendr. France 7:67. 1908.— Differing from the 

 type in the 3-lobed leaves, truncate, broad-cuneate or rarely slightly 

 cordate at base. Leaves usually broader than long, truncate, 

 broad-cuneate or rarely cordate at base, 3-lobed by sinuses acute 

 or rounded in the bottom, the lobes long-acuminate, entire, the 

 lateral often furnished near the base with one or rarely with two 

 small acuminate incurved secondary lobes, occasionally found also 

 on the terminal lobe; when they unfold hoary tomentose below and 

 pubescent above; pubescent when the flowers open toward the 

 end of March, and in early summer pubescent along the under 

 side of the midribs and veins but otherwise glabrous, usually 

 7-14 cm. long and 8-9 cm. wide, their petioles pubescent, becoming 

 glabrous; peduncles with one or occasionally two heads of flowers 

 and fruit. 



Described from specimens collected in the Provinces of Coahuila and 

 Nuovo Leon, Mexico, this Platanus has been found not to be uncommon in 

 western Texas, where it has been collected by 5. B. Buckley near Austin (with- 

 out date or number), by A. A. Heller, Kerrville, Kerr County, April 1894 

 (no. 1622), and by E. J. Palmer on the banks of the Llano River at Llano, 

 Llano County, June 23, 1916 (no. 10279), rocky banks of upper Seco Creek, 

 Bandera County, May 18, 1916 (no. 10241), gravel bank, Nueces River, Uvalde, 

 Uvalde County, September 24, 1918 (no. 14480), Fredericksburg Junction and 

 Boerne, Kendall County, June 5 and May 19, 1916 (nos. 9817, 9826, 10069), 

 rocky banks of the Guadalupe River, Kerrville, Kerr County, May 29, 1916 

 (no. 9921), rocky banks of upper Seco Creek, June 18, 1916 (no. 10241), 

 Utopia and Sabinal, Uvalde County, April 10, 191 7, June 7, 1916 (nos. loioo, 

 11523), rocky banks, Devil's River, Valverde County, October 18, 1916, 

 March 26, 191 7 (nos. 11084, 11371), Palliam, Zavalla County, March 21, 

 1917 (no. 11332). 



The close connection of this variety with typical P. occidentalis is shown 

 by the appearance on leading shoots of 5-lobed leaves with serrate lobes 

 (Palmer, Sabinal, Uvalde County, no. loioo, and Devil's River, Valverde 

 County, no. 110841). More significant perhaps is the fact that occasionally 

 trees occur growing with P. occidentalis north of Texas which cannot be dis- 

 tinguished from the Mexican types of P. glabrata. Such specimens are those 

 of E. J. Palmer, Choctaw County, Oklahoma, July 13, 1916 (no. 10463), the 

 type of P. densicoma collected in the Maquoketa River, Jackson County, 



