19211 REHDER. PHILADELPHUS VERRUCOSUS IN ILLINOIS 153 



along rocky bluffs of the Ohio River, near Golconda, Pope County; Ailan- 

 thus altissima (Mill.) Swingle, not uncommonly associated with the last; 

 Rosa galUca L., along open banks in White County; and in the Ozark 

 Ridge region seedlings of the domestic Apple are frequent, and escapes 

 of the Pear and Cherry were noted. 



Webb City, Missouri, December, 1920. 



PHILADELPHUS VERRUCOSUS SCHRADER SPONTANEOUS IN 



ILLINOIS 



Alfred Rehder 



In June, 1919, Mr. E. J. Palmer collected a Philadelphus on the rocky 

 bluffs of the Ohio River near Golconda, Illinois. AMien I saw these 

 specimens I was at first inclined to think that they represent an escaped 

 garden plant, as they did not agree with any of the now recognized native 

 species. After Mr. Palmer had collected additional material in October, 

 1920, I examined the specimens again more closely and came to the con- 

 clusion that they are identical with Philadelphus verrucosus Schrader 

 described in 1828 and credited to North America. I am unable to find 



mois 



Schrader and of subsequent authors and the plant now in cultivation as 



P. verrucosus Schrad. 



Loisel.). Schrader's 



original description was based apparently on cultivated specimens, for 

 in Reliquiae Schraderianae {Lhmaea, xii. 393) "P/i. grandijlorus Loddig. 

 Cat. non Willd." is given as synonym. This together with the fact that 

 no spontaneous specimens were kno-RTi have led many botanists to as- 

 sume that P. verrucosus is a garden form or possibly a hybrid between 

 P. puhescens Loisel. and P. coronarius L. or a related species, though 

 Kochne always maintained that it was a native American species. The 

 question became still more complicated by the identification of P. ver- 

 rucosus with P. puhescens of Loiseleur, which seems to have been first 

 made by Koehne. Schrader himself quotes P. -puhescens Loiseleur {Uerh. 

 Gen. Amat. iv. t. 2G8 [1820]) as a synonym of his P. latifolius, but Koehne 

 chiefly on the strength of the brown color of the one-year-old branch- 

 lets as shown in the colored plate considers it identical with Schrader's 

 P. verrucosus which being the later name is made by him a synonym of 

 P. puhescens. In its general appearance, however, the plant figured by 

 Loiseleur, with its large flowers of a creamy white color and its very large 

 leaves looks much more like P. latifolius and as Loiseleur himself describes 

 the branches as "grisdtres" I consider the brown color of the branchlets 

 a mistake of the artist who painted the plate; this view is strengthened 

 by the fact that in the re-issue of this plate by Drapiez {Herb. Amat. 

 Fleurs, VII. t. 501 (1834)) the one-year-old branch is painted dark gray 

 aTid the vouni^ branchlet brown, as it often is the case in P. latifolius. 



