424 abstracts: botany 



BOTANY. — Classification of the genus Annona with descriptions of new 

 and imperfectly kiiown species. W. E. Safford. Contributions 

 from the U. S. National Herbarium 18: 1-68, pis. 1-41, text figs. 

 1-75. June 17, 1914. 



This paper presents a synoptical view of the genus Annona by natural 

 groups and sections, together with descriptions of two closely allied 

 genera, Fusaea and Geanthemum, and critical notes upon Rollinia, 

 Duguetia, and Raimondia. 



Four groups of Annona are proposed: (1) the Guanabani, or sour- 

 sops, including the sections Euannona, typified by Annona muricata 

 L.; Psammogenia, typified by A. salzmanni A. DC.; Ulocarpus, typified 

 by A. purpurea Moc. & Sesse; (2) the Pilaeflorae, or silky Annonas, 

 including the sections Helogenia, typified by Annona paludosa Aubl. ; 

 Pilannona, typified by A. sericea Dunal; Gamopetalum, typified by 

 A. cornifolia St. Hil.; (3) the Acutiflorae, or sharp-petaled Annonas, 

 including Phelloxylon, typified by Annona glabra L.; Atractanthus, 

 typified by A. acutiflora Mart.; (4) the Attae, the custard-apples, com- 

 posed of the sections Chelonocarpus, typified by Annona scleroderma Saf- 

 ford; Atta, typified by A. squamosa L.; llama, typified by A. diversifolia 

 Safford; and Saxigena, typified by A. hullata A. Rich.; (5) the Annonel- 

 lae, or dwarf Annonas, including the sections Annonula, typified by 

 Annona cascarilloides Wright, of Cuba; and Annonella, typified by A. 

 glohiflora Schlecht., of Mexico. In these sections the relationship 

 between the species is shown in some cases by peculiarities of leaf struc- 

 ture, in others by the structure of the stamens or form of the flower, and 

 in still others by pecuHarities of the fruit and seed. Some of the sections 

 are more sharply defined than others. 



The following new species are described: Annona jahni, A. lutescens, 

 A. palmeri, A. crassivenia, A. sclerophylla, A. rosei. Detailed figures are 

 given oi A. montana Macf., A. sphaerocarpa Splitg., A. marcgravii Mart., 

 A. salzmanni A. DC, A. purpurea Moc. & Sesse, (including A. manirote 

 H.B.K.) A. involucrata Baill., A. paludosa Aubl., A. cornifolia St. Hil., 

 A. nutans R. E. Fries, A. acutiflora Mart., A. longiflora S. Wats., A. 

 macroprophyllata Donn. Sm., A. hullata A. Rich., A. cascarilloides 

 Wright, A. glohiflora Schlect., and A. bicolor Urban, many of these having 

 never before been figured. 



Under the heading "Plants originally described under Annona but 

 generically distmct" the author describes the genera Rollinia, Duguetia 

 and Raimondia, already established, and proposes Fusaea and Geanthe- 



