Olk \< i.\i 311 



Pharm. Archiv., 1:6-13, pi. 3-4; Hitchcock (1), 3; Otis, 212; 

 Schneider, f. 198. F. Bungeana. Schneider, f. 197. F. Bunge- 

 binervis.. Shirasawa, 274, pi. 11. F. excelsior. Blakes- 

 lee & Jarvis, 343, 558; Bosemann, 61; Fant, 40, f. 37; Schnei- 

 der, f. 198; Ward, 1:14, f. 6, 118, f. 59; Willkomm, 46, f. 80; 

 Zuccarini, 9, pi. 5. F. lanceolata (F. viridis). Blakeslee & 

 Jarvis, 343, 558; Brendel, pi. 1; Hitchcock (1), 3, (3), 16, 

 (4), 137, f. 81-82; Otis, 216. F. longicuspis. Shirasawa, 874, 

 pi. 11. F. nigra (F. samoucifolia) . Blakeslee & Jarvis, 343, 

 560, pi.; Brendel, pi. 1; Otis, 220. F. oregana. Schneider, 

 f. 197. F. Ornus. Bosemann, 62; Schneider, f. 198; Will- 

 komm, 47, f. 81. F. parvifolia. Schneider, f. 197. F. penn- 

 sylvanica (F. pubescens). Blakeslee & Jarvis, 343, 558, pi.; 

 Brendel, pi. 1; Hitchcock (1), 3, (3), 16; Otis, 214. F. quad- 

 rangulata. Brendel, pi. 1; Hitchcock (1), 3; Otis, 218. F. 

 ildiana. Shirasawa, 274, pi. 11. 



1. Twigs acutely 4-angled: buds gray. (1). F. quadrangulata. 

 Twigs not acutely angled or winged. 2. 



2. Buds blue-black. 3. 

 Buds brown. 7. 



3. Leaf-scars vertically elliptical. (Black ash). (2). F. nigra. 

 Leaf-scars half-round. 4. 



4. Shrubby. F. excelsior nana. 

 Trees. 5. 



5. Not weeping. 6. 



Weeping. (Weeping ash). F. excelsior pendula. 



6. Bark gray. (European ash). F. excelsior. 

 Bark golden. -(Golden-barked ash). F. excelsior aurea. 



7. Leaf-scars deeply concave at top. 8. 

 Leaf-scars nearly straight at top. 9. 



8. Twigs very velvety. (Pumpkin ash). F. profunda. 

 Twigs glabrate. (White ash). (3). F. americana. 



9. Twigs glabrate. (Green ash). (4). F. lanceolata. 

 Twigs velvety. (Red ash). F. pennsylvanica. 



