ENUMERATION OF THE SPECIES 145 



Rhododendron canescens f. subglabrum Rehder, forma nov. 



A typo recedit foliis costa media utrinque villosa et margine ciliato exceptis 

 subglabris; ceterum ut in typo. 



Mississippi. Hinds County : Jackson, April 15 and 30, 1915, T. G. 

 Harbison (No. 16, type, No. 38). Tishomingo County : Iuka, May 

 5, 1915, T. G. Harbison (No. 6). Lauderdale County: Meridian, 

 April 12, 1900, C. S. Sargent; April 16, 1915, T. G. Harbison (Nos. 5, 13). 

 Harrison County : Mississippi City, March 31, 1900, C. S. Sargent. 



Georgia. Habersham County: Cornelia, bank of small stream, 

 May 6, 1920, T. G. Harbison (No. 40). Randolph County: Cuth- 

 bert, pine woods, March 29, 1918, T. G. Harbison (No. 19, low shrub). 



Alabama. Cullman County: May 3, 1901, Biltmore Herb. 

 H/4246 (Nat. Herb. 969,666). Chilton County: Mapleville, April 

 13, 1912, T. G. Harbison (No. 849). Dallas County: Selma, April 

 9, 1912, T. G. Harbison (No. 825). Lee County: Auburn, April 6 

 and 8, 1913, T. G. Harbison (Nos. 817, 807). Mobile County: 

 Mobile, March 18, 1894, C. Mohr. 



Louisiana. Natchitoches Parish: Natchitoches, wet sandy 

 banks, April 15, 1915, E. J. Palmer (No. 7228). Calcasieu Parish : 

 Lake Charles, April 2, 1913, C. S. Sargent. East Baton Rouge 

 Parish : Baton Rouge, April 15, 1920, R. S. Cocks (No. 3321). 



Texas. Hardin County : Fletcher, March 17, 1918, E. J. Palmer 

 (No. 13,095, in part). 



This form differs from the type in its glabrescent or nearly glabrous leaves; 

 they may be either glabrous on both sides except the ciliate margin and the mid- 

 rib which is finely villous above and beneath and often also sparingly strigillose 

 beneath, or sometimes they are finely pubescent on the upper surface while young 

 and rarely also sparingly pubescent beneath. In the pubescence of the winter- 

 buds, of the branchlets and of the flowers, this form does not differ from the type 

 and is thus easily distinguished from R. nudiflorum with which it has been confused. 



This form is distributed from northern and western Georgia through Alabama 

 to northeastern Mississippi, western Louisiana and southeastern Texas, and south 

 to the coast of Alabama, Mississippi and Louisiana. Its range lies wholly within 

 the range of the type, but is apparently chiefly restricted to the western portion 

 of it. The only stations known to me east of Alabama are near Cuthbert, Randolph 

 County, in western, and near Cornelia, Habersham County, in northeastern Georgia. 

 It has been usually confused with R. nudiflorum, and the extension of the range of R. 

 nudiflorum beyond Tennessee and South Carolina given in those floras which keep 

 R. nudiflorum distinct from R. canescens refers apparently to this form. It is con- 

 nected by intermediate forms with the type and generally the pubescence on the 

 leaves of specimens of the type from the western part of the range of the species 

 is much thinner than that of the eastern specimens. 



Rhododendron canescens f. subglabrum has only recently been introduced into 

 cultivation through the Arnold Arboretum, where it was raised from seed sent by 

 E. J. Palmer in 1916 from Fletcher, Texas. It will probably not be hardy in the 

 northern states and does not differ from the type in its ornamental qualities. 



