19211 REHDER. PHILADELPHUS VERRUCOSUS IN ILLINOIS 155 



Capsule about 1 cm. long, with the margin of the calyx-tube somewhat 



above the middle. 



Illinois. PopeCounty: rocky bluffs of the Ohio River, near Golconda, 

 June 7, 1919, E. J. Palmer (No. 1538); same locality, high rocky (sandstone and 

 limestone) bluffs, October 28, 1920, E. J. Palmer (No. 19581). » 



Cultivated Specimens. Bot. Card. Berlin, July 2, 1887, and May 6, 1888, 

 July 4 and August 20. 1892, E. Koehne (Nos. 3509, 3512, 9580, 9934). Bot. Gard. 

 Goettingen, July 1 and 4, 1890, July U, 1892, and September 28, 1893, A Rehder 

 Goepperthain near Breslau, June 19 and August 21, 1905, June 11 and July ». 

 1907, C. Baenitz (Herb. Dendrol.). Bot. Gard. Cambridge, Mass., June 25, 1898, 



A. Rehder. 



The species appears to be most closely related to P. pubescens Loisel. 

 (P. latifoUus Schrad.) which differs chiefly in the gray color of its one- 

 year-old branches and in the larger flowers and larger leaves. The de- 

 scription by Schrader of the pedicels, calyx and of the midrib and veins 



ernicis 



apparently exaggerated as far as it concerns the little warts, for K. Koch 

 {Dendr. i. 342) says that he did not see such warts on Schrader's original 

 specimens; neither are they mentioned by Koehne, who also had seen 

 Schrader's types. Sometimes one finds, on some specimens more, on 

 some less, particularly on the midrib of the leaves and on the petioles 

 minute excrescences of the epidermis at the base of the hairs, but they 

 are not at all prominent; the wartlets of the branchlets mentioned by 

 Schrader {Linnaea, xii. 393) may be seen sparingly on a shoot of Palmer's 

 No. 19581. Philadelphvs verrucosm is probably not restricted to this 

 one locality and will be found in Kentucky and possibly in Tennessee. 

 It is apparently of rare and local occurrence like some other species of the 

 genus, as for instance P. laxus Schrad., the habitat of which was con- 

 sidered uncertain for a long time, but which is, as I have pointed out 

 recently,^ a native of Tennessee and Georgia. 



I may add here that the combination P. verrucosus var. nivalis I made 

 on p. 199 of vol. I of this Journal, on the assumption that F. verrucosus 



I In a recent letter Mr. Palmer states: "With reference to the Philadelphus from South- 

 ern Illinois, it had every appearance of being a native shrub long established in the place 

 where I found it, although it is, of course, impossible to say just how these isolated things 

 originated or that the seed may not have been transported in this case long ago by wind 

 or animal agency from cultivated stock. However, there is nothing to suggest this in the 

 surroundings or appearance of this Philadelphus. It is growing along the slope and rocky 

 talus of a very high bluff, with east or northeast exposure close to the Ohio River. It is 

 three or four miles from the town of Golconda and some distance from any dwelling or settle- 

 ment, anil the immediate surroundings are so rocky that no garden or habitation would 

 have been possible close by. Indeed before the railroad, which has lately been cut along 

 the base of the bluff, was constructed it would have been almost inaccessible. I made a 

 thorough exploration in October and found a number (perhaps not less than ten or a dozen) 

 clumps of the shrub growing along the steep rocky slope below the mam bluff and some 

 thirty or forty feet above the river. The bluff consists of alternating beds of limestone 

 and sandstone of the Mississippian Series, and is well wooded with a variety of trees and 

 shrubs and tangled vines. The tallest specimens of the Philadelphus were, I judge, 2/^ 

 to 3 metres tall, with many canes and upright or somewhat recurved slender branches. In 

 its surroundings and habit it looks as much at home, and as certainly a native shrub, as 

 any I ever saw, and with all due caution I would not hesitate to class it as such." 



1 



Vol. I. 198 (1920) of this Journal. 



