252 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[vol. 10 



occurring at very base and on lower side of petiole, 2-4 mm long; mature 

 capsule 2.5-3 cm long (high), 3.5-4 cm wide; seeds 2.7-3 cm long, 1.5-2 cm 

 broad; outer surface of capsule finely verruculose-rugulose. 8. P. rhododactylum. 

 5. Midrib and lateral nerves of lower side of leaf -blade strigose; lower surface 

 of leaf -blade not glaucous; petiolar glands usually 3, two occurring lat- 

 erally and/or one at the base of the lower side of petiole, 1 mm long; 

 mature capsule 4.2-5 cm long (high), 5-6 cm wide; seeds 4.2-4.8 cm long, 

 2.5 cm wide; outer surface of capsule conspicuously areolate-rugose. 



9. P. rugosum. 



Leaves opposite, in pairs. 

 6. Upper as well as lower surface of leaf -blades glabrous. 7. P. negrense. 



6. At least the upper surface of leaf-blades scabridulous or more conspicuously 

 pubescent. 



7. Lower surface of leaf-blades glaucous or whitened, glabrous or sparsely or 

 minutely puberulous; petiole glabrous or sparsely pubescent; corolla-lobes 

 mainly acute to subobtuse. 

 8. Corolla 26-27 mm long (20-22 in dried state) ; corolla-lobes 6-8 mm wide, 

 Vs~ x k length of corolla; inflorescence 3-8 cm broad, 2 1 /£-3 times as long as 

 broad; lower main lateral branches of inflorescence 3.5-4 cm long, upper 

 ones 1.5-2 cm long; lateral branches and ultimate pedicels of inflorescence 

 rufous-hirsute. 5. P. maguirei. 



8. Corolla 21-23 mm long (18-20 mm in dried state) ; corolla-lobes 5-6 mm 



wide, mostly % or more the length of corolla; inflorescence 8-17 cm broad, 

 as broad as or broader than long to at most 1% times as long as broad; 

 lower main lateral branches of inflorescence 4.5-6 cm long, upper ones 2.5-3 

 cm long; lateral branches and ultimate pedicels of inflorescence cinereous- 

 strigillose. 6. P. decipiens. 



7. Lower surface of leaf -blades more or less conspicuously pubescent; petioles 

 manifestly pubescent; corolla-lobes mainly rounded to more rarely acute. 



9. Peduncle densely tomentose or tomentulose; corolla 17-24 mm long; mature 



fruiting capsule as broad as or broader than long (high), 3-3.5 cm long, 

 3.5-4 cm broad; anther 3.4-4 mm long; style 8.5-11 mm long; leaf -blade 

 rounded at apex. 4. P. orinocense. 



9. Peduncle rufous-villous with conspicuously spreading hairs; corolla 14-16 

 mm long; mature fruiting capsule longer (higher) than broad, 4.5-5 cm 

 long, 3.5-4 cm broad; anther 4.25-4.5 mm long; style 5-6.5 mm long;' 

 leaf -blade subobtuse or obtusely acute at apex. 3. P. duckei. 



1. Platycarpum froesii Bremekamp, Meded. Bot. Mus. Herb. Rijks. Utrecht 141 : 

 374-5. 1957. 



2. Platycarpum schultesii Steyermark, Bot. Mus. Leafl. 17: 96. 1955. 



Distribution. Southeastern Colombia, where known only from a tributary of 

 the Rio Vaupes. 



COLOMBIA. Vaupes: Rio Parana Pichuna (tributary of Rio Vaupes), lat. 

 1° 10' N, Long. 70° 30' W; alt. 220 m: bush; flowers pink; Jun 1953, Richard 

 Evans Schultes & Isidro Cabrera 19929 (holotype F, isotype US). 



In the shallowly semi-lunulate gland of the petiole, this species resembles P. 

 decipiens and P. orinocense. From the former it is at once distinguished by the 

 ternate leaves with their densely pubescent non-glaucous lower surface, while 

 from P. orinocense it is separated by the ternate leaves rounded at apex witli 

 shorter hairs on the lateral nerves and midrib of the lower side -of the blade, and 

 by the shorter and sparser pubescence of the peduncle. It is apparently most 

 closely related to P. froesii of Brazil, from which it differs in the semi-lunulate 

 instead of quadrate petiolar gland, longer, subacute leaves with denser pubes- 

 cence beneath, more numerous lateral nerves more prominently elevated beneath, 

 and by the pluricostate villosulous peduncle. 



