20 BLAKE: REVISION OF THE AVOCADOS 



4 to 5 mm. long, 2 mm. wide, the inner slightly longer, 5.3 to 6 mm. 

 long, 2 mm. wide; stamens of series I 3 to 4 mm. long, with slender 

 sparsely ciliate filaments 1.5 to 2.7 mm. long; of series II similar but 

 longer, the filaments 2.2 to 2.9 mm. long, the anther 1.3 mm. long; 

 of series III similar, the filaments 2.5 to 3.2 mm. long, the anthers 1.2 

 to 1.4 mm. long, the glands borne about one-sixth to one-fifth the length 

 of the filament above its base, ovate or rotund-ovate, obtuse or ob- 

 liquely emarginate at apex, cordate-sagittate at base, glabrous, borne 

 on distinct but shorter glabrous stipes; staminodes glabrous, 1.8 to 

 2.5 mm. long, the head triangular, narrowed from the base, apiculate, 

 equaling or shorter than the filament; ovary glabrous, ovoid; style 

 glabrous, slightly longer than ovary; fruit oblate to globose, 7 to 12 cm 

 long, light yellowish green outside, with smooth thickish skin ; seed often 

 loose in the cavity. 



Type in the U. S. National Herbarium, No. 1012124, collected in 

 Charles Deering's grove at Buena Vista, Florida, April 7, 1916, by 

 Wilson Popenoe (No. 219). Other specimens examined (cultivated): 



Florida: Plant Introduction Garden, Miami, April 5, 1916, Po- 

 penoe 196, 198 (S. P. I.)- 



In foliage characters Persea leiogyna is so close to many specimens of 

 P. americana that the two species can not be distinguished by leaves 

 alone. In its shorter greenish yellow (when dried) sparsely pilosulous 

 perianth, its smaller sparsely ciliate stamens, its glabrous staminodia, 

 and its glabrous ovary, however, P. leiogyna is unique in the group of 

 species known under the name of avocado. 



Persea leiogyna is the commonly cultivated "Trapp avocado" of 

 Florida, from Fort Pierce to Winter Haven, Bradentown, and south- 

 ward. The "Family avocado," represented by Popenoe 196, is identical 

 in botanical characters. The latter is said to be a variety of local 

 origin, rather extensively propagated. 



The material of this species which I have examined consists of that 

 above cited, and in addition eight branches from different trees of the 

 "Trapp avocado" collected in the vicinity of Miami in the early spring 

 of 1919 by Mr. Popenoe. All of these agree precisely with the type in 

 the diagnostic characters above mentioned. The species flowers from 

 March to April, and fruits from October to December. 



The many thousand trees of the Trapp avocado now in cultivation 

 in Florida and Cuba have all been produced by budding and grafting 

 from the single original tree, grown in Florida from seed believed to 

 have been brought from Cuba, by the late C. L. Trapp, of Cocoanut 



