CONTENTS. 
Division of the genus into natural groups....................------ 
Introductory notes...............0.. 2200002 cece eee eee eee 
Characters of the genus..................2...--2-----2---0200- 
Geographical distribution.........................-2-2--22--2-. 
Species incorrectly referred to Annona....................-.-- 
Scheme of the proposed subdivisions........................--- 
Key to the groups........-.......22-- 202-202 - eee eee eee eee eee 
Characters of the groups and sections.....................----- 
Group Guanabani (soursops)...........-...--------------- 
Section Euannona.....................2.----------- 
Section Psammogenia ............-.--.-----------+-- 
Section Ulocarpus... ........-.---------0---2---2 222+ 
Group Pilaeflorae (silky Annonas).................---.---- 
Section Helogenia................... wee e cece cece eee 
Section Pilannona ................-2..-.---2-------- 
Section Gamopetalum..........................------ 
Group Acutiflorae (sharp-petaled Annonas).........-....--- 
Section Phelloxylon.... ...........-2..-.-2---------- 
Section Atractanthus...................--.--+------- 
Group Attae (custard apples). ...........--..------------- 
Section Chelonocarpus.......-.......-----------+--- 
Section Atta... ..-.... 2.2... eee eee eee eee eee eee eee 
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Section Saxigena.................. cece ee eeee eee e eee eeeee wees 
Group Annonellae (dwarf Annonas) ..................--- 
Section Annonula...............2-2.22-20222---0-- _ 
Section Annonella................-.-------- 
New and imperfectly known species of Annona.. banearens 
Plants originally described under Annona but generically distinct. 
Rollinia, Duguetia, and Raimondia, genera msieesy established. . 
Fusaea and Geanthemum, new genera........... .- 
Index ...----------- 2 ee nn ee eee ee pe eee eee eee eee 
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