1961] 



BOTANY OF THE GUAYAXA HIGHLANDS PART IV (2) 



71 



7. Leaflets 7-8.5 cm long, 3.5-4.5 cm wide, the lower leaflet surface obscurely pruinose- 

 lepidote ; mature buds about 1 cm long ; petals 2 cm or less in length ; stipe of the 

 ovary glabrous, about 1 mm long; style glabrous. 9. A. occidentalis. 



8. Ovary glabrous or subglabrous. 8. A. macrophylla. 



8. Ovary densely pubescent. 9. 



9. Stipe of the glabrescent ovary about 10 mm long, twice or more times as long as 



the ovary. -lb. A. latifolia var. pubescens. 



9. Stipe of the persistently pubescent ovary 2.5 mm long or shorter, never longer than 



the ovary at anthesis. 10. 



10. Venation strongly salient, conspicuous on both surfaces of the leaflets. 5. A. reticulata. 

 1<». Venation never conspicuous, usually obscure on the upper surface of the leaflets. 11. 



11. Leaflets acute to acuminate apically, the upper and lower surfaces markedly dis- 

 colorous. 12. 



11. Leaflets obtuse to rounded-obtuse, the upper and lower surfaces not markedly dis- 

 colorous. 13. 



12. Leaflets tesselate and appressed-puberulous beneath. 6. A. discolor. 



12. Leaflets aureo-pubescent and not at all tesselate on the under surface. 6'. A. aurea. 



13. Leaf axis appressed-puberulous, the petiolules 5-7 mm long. 6". A. elliptica. 

 13. Leaf axis glabrous, the petiolules 15-20 mm long. 6"'. A. petiolulata. 



Bauhinia chalkos Cowan, sp. now Fig. 19. 



Frutex seandens 5 in altus, ramnlis dense pilosulis, stipulis eaducis, non 

 visis. Petiolns 6-6.5 cm Longus, dense pilosulus, lamina breviter bilobata, lobis 

 20-23 mm longis, triangularibus, obtnsis ad subacutis, suborbiculari ad oblatam. 

 13-13.5 cm longa, 14-16 cm lata, ad basim valde cordata, 11-nervia, nerviis 

 leviter impressis supra, infra salient ibns, vennlis subobseuris, faciebns superior- 

 ibns glabris. inferioribus nitido-cupreis. Infloreseentiae racemosae, plernmqne 

 terminates, 11-21.5 cm longae, axe dense pilosulo, braeteis braeteolisqne deciduis, 

 2.5-3 mm longis. oblanceolatis, acntis. pedicello 3-5 mm longo, dense pilosnlo. 

 Calyx cupreo-strigulosus, late campannlato-ovoideiis. valde alato-costatns, tubo 

 4 mm longo, lobis 6.5 mm longis, 5.5 mm latis, ovato-oblongis, apice reflexo, sub- 

 orbicnlari. ea. 2 mm diametro. Corolla gilva, cupreo-sericea extus, intus glabra, 

 petalornm unguiculo ea. 7 mm longo, lamina orbicnlari, 13-16 mm diametro, ad 

 apicem rotnndata. Filamenta paree villosa. ea. 11 mm Longa; stylus glaber; 

 ovarium dense cupreo-sericeum. Frnctns ignotus. 



VENEZUELA: Amazonas: along Rio Casiquiare just above Piedra Guanare, alt. 110 m; 

 woody vine climbing 5 m; fls cream; 25 Jun 1959, John J. Wurdack 4' L. S. Adderley 43174 

 (holotype, US No. 2281798). 



The copper}' color of the under surfaces of the leaves in this new species is 

 the basis for the specific epithet (*/aX/.6?: "of copper")- In this respect B. 

 chalkos is quite similar to B. cupreonitens, to which it is surely rather closely 

 related. The new species has much larger flowers; the reflexed tips of the calyx 

 lobes are much smaller; the leaves are larger, differently shaped, and with 2-4 

 fewer principal veins; and finally, the geographic range of the two species is 

 disjunct. 



Campsiandra angustifolia Spruce ex Benth. 



VENEZUELA: Amazonas: along Rio Orinoco just below mouth of Cano Yapaeana, alt. 

 125 m; tree 15 m; corolla white, rose-flushed; stamens red; 18 Jun 1959, WurdacJ: 4' Adderley 

 43029; infrequent along Rio Casiquiare just below Capihuara, alt. 130 m; tree 12 m; petals 

 white, red-flushed outside; stamens deep red; 26 Jul 1959, Wurdaclc 4' Adderley 43636. 



These two collections are the first reported in Venezuela but the range ex- 

 tension is not great, since the species occurs in nearby parts of Colombia and 

 Brazil. 



