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BOTANY. — Annona sericea and its allies. William E. Safford. 



Contributions from the United States National Herbarium, 16, 



Part 10. pp. 263-275. December 13, 1913. 

 In continuance of his studies in the Annonaceae, the writer finds that 

 the silky annona of French Guiana (Annona sericea Dunal) is the type 

 of a natural subgroup of the genus Annona, that should be segregated as 

 a section, for which he proposes the name Pilannona to give it co-ordinate 

 rank with Euannona, Atta, llama, Annonella, and Chelinocarpus. As 

 in other natural plant groups there are certain species which appear to 

 form connections with allied groups, so in the section Pilannona the type 

 species, Anno7ia sericea Dunal, which has normally 3 petals, appears to 

 be allied to the 6-petaled A. paludosa Aubl., while at the opposite end of 

 the series Annona jamaicensis Sprague approaches A. cherimola, belong- 

 ing to type section Atta. In addition to descriptions of the principal 

 species included in this section photographs of a number of original type 

 specimens are presented, including that of Annona echinata Dunal in the 

 De Candolle Herbarium at Geneva, and the flower of A . sericea described 

 and figured by Dunal in his classical monograph of the Annonaceae. 

 Among the new species described and figured are Annona jenmanni, 

 from British Guiana; A. trinitensis, from the island of Trinidad; A. 

 longipes from southern Veracruz, Mexico; A. holosericea, from the 

 Pacific coast of Costa Rica; spraguei, from Panama; Annona cercocarpa, 

 from Colombia and acumhiata, collected on the Isthmus of Panama in 

 1861 by Dr. Sutton Hayes. In addition to the above Annona jamaicen- 

 sis Sprague is redescribed and illustrated with two photographs. 



This paper deals with the taxonomy of the species described. It will 

 be followed shortly by a more comprehensive one on the '' Classification 



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