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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [yol. 9, No. 3 



The keys to the species in each of the sections is followed by notes on each 

 of the species and citations of specimens seen; in all cases, only collections 

 represented at the New York Botanical Garden are cited. There has been no 

 attempt to arrange the species phylogenetically, but the related species are 

 grouped together. Latin diagnoses to validate the subgenera and sections will be 

 found in the part dealing with the species. 



Subgenera and Sections of Dicymbe 



1. Complete petals 3 or 5, equal or slightly unequal; incomplete ones without well- 

 developed blades. Sepals 4. Bracteoles without gland at the apex, free from the 

 cupular hypanthium (except in D. jenmani). Subg. Dicymbe 2. 



1. Complete petals one or none, incomplete ones without well-developed blades. Sepals 5. 

 Bracteoles with terminal gland, united in basal part of the cylindrical hypanthium. 



Subg. Apoxypetala 3. 



2. Petals 5, without well defined stipes. Sect. Dicymbe. 



2. Petals 3, stipitate (6. D. amazonica). Sect. Triplopetala. 



3. Complete petal one, with distinct stipe. Sect. Eremopetalcu 

 3. Complete petals none, all vestigial. Sect. Apoxypetala. 



Sect. Dicymbe 



1. Bracteoles less than 1.5 cm long. Hypanthium about 1 mm long. Leaflets narrowly 

 lanceolate, 5-8 cm long, 1.5-2 cm wide. 1. D. heteroxylon. 



1. Bracteoles 2-3 cm long. Hypanthium much longer than 1 mm. Leaflets ovate, oval, or 

 or elliptic, 7-18 cm long, 3-7.5 cm wide. 2. 



2. Leaves 2-jugate, glabrous, the petioles 1.5-2 cm long, the blades minutely glandular- 

 punctate on lower surfaces and on fruits. 3. D. corymbosa. 



2. Leaves 3-6-jugate, the petioles longer, the blades pubescent and epunctate. 3. 



3. Leaflets without waxy bloom on under surfaces but slightly strigulose. Petals strongly 

 unequal, one much larger than the remainder. 2. D. altsoni. 



3. Leaflets with waxy bloom and densely pubescent on under surfaces. Petals equal or 

 only slightly unequal. 4. 



4. Pubescence on the lower surface of leaflets erect, the hairs crispate; waxy bloom 

 usually present in minute, annular granules. Bracteoles free from the cupular hypan- 

 thium; style 40 mm long; stigma 1.5 mm in diameter. 5. D. fraterna. 



4. Pubescence on the lower surface of leaflets subappressed, the hairs straight; waxy 

 bloom usually in closely contiguous papillae. Bracteoles united to the cylindric 

 hypanthium through most of its length; style about 30 mm long; stigma less than 1 mm 

 in diameter. 4. D. jenmani. 



Sect. Eremopetala 



1. Leaves 2-jugate, the leaflets 3-6.5 cm long, 2-3.5 cm wide, rotund and slightly 

 retuse. Petals and filaments sparingly strigulose; one complete petal with a 4 mm 

 stipe, attenuate at the base. 7. D. yutajensis. 



1. Jjeaves unijugate, the leaflets 8-10 cm long, 5-5.5 cm wide, only rotund. Petals and 

 filaments villose; one complete petal with a 2 mm stipe and cordate at the base. 



8. D. froesii. 



Sect. Apoxypetala 



1. Bracteoles adnate to the hypanthium nearly to its apex; apical gland of bracteoles 

 obvious, 1.5 mm long, umbilicate; petals villose. Leaves 5-jugate. 9. D. uaiparuensis. 



1. Bracteoles adnate to the hypanthium about half its length; apical gland of bracteoles 

 inconspicuous, less than 1 mm long, not umbilicate; petals slightly strigulose ex- 

 ternally. Leaves 2-jugate. * 10. D. duidae. 



Dicymbe Subgenus Dicymbe c 



A subgenere Apoxypetala petalis 5 vel 3 (duobus haud expansis), aequalibus 

 vel parum inaequalibus, sepalis 4, bracteolis ad apicem sine glande, liberis, 

 hypanthio cupulari differt. 



TYPE species: Dicymbe corymbosa Spruce ex Benth. 



