70 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[vol. 10 



LEGUMINOSAE CAESALPINIOIDEAE 



Aldina petiolulata Cowan, sp. nov. Fig. 59. 



Arbor 40 m alta, 60 cm diametro [DBH], ramulis dense mierostrigulosis et 

 lenticellatis, stipulis non visis. Petiolus 4—7 cm longus, gracili-cylindricus, glaber, 

 rhachi 7.5-8.5 cm longa, glabra, gracili-cylindrica ; petioluli 15-20 mm longi, 

 glabri, graciles, teretes, laminis ellipticis, 8.5-10 cm longis, 3.5-4.5 cm latis. ad 

 basim acutis usque ad subobtusos, ad apicem obtusis et plerumque rotundatis, 

 glabris nitidisque supra, infra pallidioribus, f urf aceo-cerif eris et albo-microstrigu- 

 losis, eosta impressa et venulis primariis planis supra, infra costa et venulis 

 primariis plus minusve salientibus. InfLorescentiae 15-23 cm longae, paniculatae, 

 axe aureo-sericeo, bracteis bracteolisque persistentibus, triangularibus, pedicello 

 2.5-3 mm longo, alabastris ca. 13 mm longis. Calyx ca. 11 mm longus, extus 

 aureo-sericeus, lobis 2-3, intus villosulis ; petala alba, obovata, valde cucullata 

 ca. 15 mm longa et 10 mm lata, glabra. Filamenta 12 mm longa, antheris 4.5 

 mm longis, 1 mm latis, anguste oblongis. Stylus 2 mm longus, glaber; ovarium 

 3 mm longum, 2 mm latum, ovato-oblongum, sericeum, gynopboro 2 mm longo, 

 obcuneato, sericeo. Fructus ignotus. 



VENEZUELA: Amazonas: frequent in slope forest near Camp 3, alt. 700-800 m, Cerro 

 de la Neblina, Rio Yatua ; tree 40 m X 00 em I DBH]; bark with red clear exudate; petals 

 and filaments white; anthers cream; 30 Dec 1957, Bassett Maguire, John J. Wurdack 4' Celia 

 K. Maguire 42555 (holotype, US No. 2267456). 



The length of the petiolules is emphasized by the choice of specific epithet 

 for this new species, which is most nearly related to A. Occident alis. They are 

 distinguished in the following key, which also includes other species of this 

 genus described since my review of it (Mem. N. Y. Bot. Gard. 8:103. 1953.) 



1. Leaflets completely glabrous on the lower surface as well as on the upper. 2. 



1. Leaflets pubescent on the lower surface, sometimes obviously so but often minutely. 3. 



2. Mature buds 7-8 mm long, petals 7-9 mm long; stipe of the ovary as long as or 

 shorter than the ovary; leaflets broadly ovate to lanceolate; inflorescence much 

 branched 10. A. heterophylla. 



2. Mature buds 15 mm long, petals 15-20 mm long; stipe of the ovary 2-3 times as 

 long as the ovary; leaflets oblong, oblong-oval, or oblong-ovate; inflorescence 

 racemose or lax and sparsely branched. 4a. A. latifolia var. latifolia. 



3. All parts except the upper leaf surface fuscous-velvety. Calyx usually split into two 

 parts 3. A. kunhardtiana. 



3. Pubescence where present minute, densely and closely appressed (at least on dried 

 specimens). Calyx split into 3-5 irregular parts. 4. 



4. Leaves mostly 7-11-f oliolate. 5. 



4. Leaves usually not over 5-foliolate (to 7-foliolate in A. aurea and A. occidentalis) . 6. 



5. Leaflets 3-4 cm wide, lanceolate-oblong, the apices long-acuminate; mature buds 

 about 1.5 cm long; petals oblong, 2 cm long, 0.8 cm wide; filaments about 1.5 cm 

 long; ovary 5 mm long with a stipe up to 10 mm long. 2. A. potyphylla. 



5. Leaflets (5.5-) 7.5-11 cm wide, oblong or oblong-oval, the apex abruptly short- 

 acuminate or acute; mature buds 2-2.5 cm long; petals obovate-orbicular with a 

 cuneate base, 3-4.5 cm long, 2.5-3.5 cm wide; filaments 2.5-3.5 cm long; ovary 7-8 

 mm long (sometimes two ovaries produced per flower), the stipe 1.5-1.8 cm long. 



la. A. insignis var. insignis. 



6. Hairs on lower leaflet surface strictly appressed, directed toward the apex and the 

 margin of the leaflet, the apex of the leaflets not retuse or rotund. 8. 



6. Hairs on lower leaflet surface at first erect or suberect, collapsed and more or less 

 decumbent on drying, the apex of the leaflets rotund and retuse. 7. 



7. Leaflets 10-13 cm long, 5.5-6.5 cm wide, the lower leaflet surface evenly glaucous; 

 mature buds about 2.5 cm long; petals 3.5-4.5 cm long; stipe densely pubescent, 



6-9 mm long; style sparsely gray-sericeous. lb. A. insignis var. retusa. 



