JOURNAL 



OF THE 



ARNOLD ARBORETUM 



Volume II APRIL, 1921 Xuaiber 4 



NOTES ON AMERICAN WILLOWS. XI 



Camillo Schneider 



a. SOME REMARKS ON THE SPECIES OF SECTION CORDATAE 



In note x, on p. 65 of vol. ii of this Journal I made the statement that 

 I had not thoroughly studied this group because Mr. C, N. Ball was 

 writing a monograph of it. Unfortunately he had not been able to finish 

 his study, and by request of the editor I have prepared a short note based 

 on my own observations on species of this section. It is with great 

 reluctance that I do this. Mr. Ball has already proposed some new 

 species and has used these names in different herbaria without, however, 

 publishing descriptions of them. He has also applied several old names 

 to certain forms and I have seen a good many specimens bearing his own 

 determinations. In May, 1919 he kindly gave me a typewritten list of 

 the species, varieties and synonyms including the species I have referred 

 to sect. Commutatae and Balsamiferae; S. Wolfii was also included in his 

 list. On June 15, 1919, I wrote liim a long letter in regard to several 

 names used by him explaining my opinion on some of Andersson's critical 

 forms but I have not received an answer to this letter. At present I 

 have to mention some of his new names, and I wish to state emphatically 

 that I can not do more in this note than to give a few hints as to the species 

 and forms belonging to this group. My study is based on tlie same 

 material as mentioned on p. 67 of vol. i of this Journal, and I wish to 

 express my best tlianks also to Mr. R. V. Bradshaw of Eugene, Ore., for 

 sending me good material of some species including S. viachcnzieana. 



The main diflFercnce of the species mentioned can be taken from the 

 key given below, and also from the keys in note xii. As to the syn- 

 onymy of the section the following is to be said: 



Sect. Cordatae Barratt apud Hooker, Fl. Bor.-Am. ii. 149 (1839). — Ball 

 apud Coulter & Nelson, New Man. Rocky Mts. Bot. 132 (1909). — Sect. 

 Rigidae (sive Hastatae) Andersson in Svcnsk, Vet.-Akad. Handl. vi. 157 

 (Monog. Salic.) (1867), pro parte; apud De Candolle, Prodr. xvL^251 

 (1868), pro parte. — Rydberg, Fl. Rocky Mts. 188 (1917), pro parte.— 

 Sect. Hastatae Schneider, 111. Handb. Laubh. i. 49 (1904), quoad S. cor- 

 datavi. 



