12 BLAKE: REVISION OF THE AVOCADOS 



I. Persea americana Mill. Gard. Diet. ed. VIII. 1768. Common 



AVOCADO. 



Laurus persea h. Sp. PI. 1: 370. 1753. 



Persea gratissiina Gaertn. f. Fruct. 3: 222. pi. 221. 1807. 



Persea graiissinm vulgaris Meissn.; DC. Prodr. 15^: 53. 1864. 



Persea gratissima ohlonga Meissn.; DC. Prodr. 15^: 53. 1864. 



Persea gratissima macrophylla Meissn.; DC. Prodr. 15^: 53. 1864. 



Persea persea Cockerell, Bull. Torrey Club 19: 95. 1892. 



Tree, up to 20 meters high; branchlets glabrous to finely puberulous 

 or pilosulous, more or less glaucous; leaf blades 9 to 30 cm. long, 3.5 

 to 20 cm. wide, oval varying to elliptic or obovate-oval, rarely ovate or 

 suborbicular, short-pointed, acute, or acuminate, sometimes obtuse, 

 at base unequal, broadly rounded to cuneate, papyraceous to perga- 

 mentaceous, feather-veined (lateral veins 5 to 7 pairs) and finely pro- 

 minulous-reticulate beneath, above deep green, glabrous or sparsely 

 pubescent along costa, beneath glaucescent, glabrous or pilosulous with 

 more or less spreading hairs along costa and primary veins, rarely 

 over whole surface; petioles glabrous or puberulous, 2 to 6.5 cm. long; 

 panicles densely griseous-puberulous, several or many toward ends of 

 branches, 6 to 22 cm. long (including the 2.5 to 9 cm. long peduncle); 

 pedicels 3 to 6 mm. long; perianth (5) 5.5 to 7 mm. long, densely gri- 

 seous-tomentulose both sides; segments elliptic or lance-elliptic to oval- 

 ovate, obtuse, the outer i to 1.5 mm. shorter than the inner; stamens 

 of series I 4.5 to 5.5 mm. long, the slender filaments densely pilose, 

 3 to 3.8 mm. long; of series II similar, 4 mm. long; of series III similar, 

 4.5 to 5.4 mm. long, the filaments (3.2 to 4 mm. long) bearing 0.5 to 

 0.8 mm. above base two rotund obtuse or rounded glands on pilose 

 stipes of about the same length; staminodes 1.8 to 2.8 mm. long, the 

 densely pilose stipe i to 1.8 mm. long, the head triangular, acute, 

 usually apiculate, truncate or sagittate-cordate at base, 0.3 to 1.2 mm. 

 long; ovary densely pilose, style pilose, about twice as long as ovary. 

 Type Locality: West Indies. 

 Specimens Examined: 



Vera Cruz: San Pablo near Rio Nautla, June, 1841, Liehntann 13. 

 Colipa, March, i8di, Liebmann 86. Orizaba, June, 1918, Popenoe 

 826 (S. P. I.). 



Puebla: Atlixco, Dec, 1918, Popenoe 864 (S. P. I.). 



Oaxaca: Cafetal Concordia, near Pochutla, May, 1919, Popenoe 

 825 (S. P. I.). 



Chiapas: Tapachula, Nov., 1918, Popenoe 819, 821 (S. P. I.). 

 Zacualpa, July, 1918, Popenoe 828 (S. P. I.). 



Yucatan: Izamal, 1895, Gaumer, 402. 



Guatemala: Near Finca Sepacuite, Alta Verapaz, 1902, Cook & 

 Griggs 20, 322, 564. Guatemala City, Feb., 191 7, Popenoe 758 (S. 

 P. I.). Antigua or vicinity, Feb., 1917, Popenoe 765, 766, 767, 769, 

 771 (S. P. I.). Los Verdes, Dept. Amatitlan, Nov., 1893, Heyde c~' Lux 

 6229. Pacaya, March, 1890, J. D. Smith 1941. 



El Salvador: Without definite locality, 1905, Renson 219. 



Costa Rica: San Francisco, March, 1897, Tonduz 10999. Port 



