BIGNONIACEAE 
(Contributed by N. Y. Sandwith) 
Tabebuia subtilis Sprague & Sandwith var. Schul- 
tesiana Sandwith var. nov. 
A 7. subtili pilis lateris interni corollae tubiatque zonae 
infra insertionem staminum ad papillas breves obtusas 
redactis differt. 
This material has the main characteristics of Tabebuia 
subtilis, which is asimilar small tree growing in the same 
type of habitat —on rocks by rapids —in the Potaro 
River Valley in British Guiana. It differs in the pubes- 
cence of the interior of the corolla tube, which is reduced 
to very short and blunt papillae, whereas, in typical Tabe- 
buia subtilis, this pubescence is composed of long papilla- 
like hairs. No fruit is present in the Colombian material 
which, | am convinced, is most prudently treated, on the 
evidence, as a variety of Tabebuia subtilis. 
CotomBia: Comisarias del Amazonas-Vaupés, Rio Apaporis, Raudal 
Yayacopi (La Playa) and vicinity. Quartzite base; alt. about 800 ft. 
“*A small scraggly tree. Flowers yellow.’*> April 15, 1952, Richard 
Evans Schultes & Isidoro Cabrera 16195 (Uyrr in Herb. Kew). 
RUBIACEAE 
Platycarpum Schultesit Steyermarh sp. nov. 
Frutex, ramis lignosis pubescentibus, vetustioribus 
scabrido-hirtellis, juvenilibus hirtello-hispidulis;  foliis 
plerumque ternatis, rarius Oppositis, coriaceis, petiolatis, 
petiolis 83-7 mm. longis, dense hirtellis; laminis elliptico- 
oblongis vel elliptico-oblanceolatis, obtusis vel subobtu- 
sis, basi acutiusculis, 8-14¢m. longis, 2-5 cm. latis, supra 
aspero-scabridulis, costa media dense hirtella, subtus 
dense velutino-hirtellis, pallidioribus, nervis: lateralibus 
utroque latere 11-18 subtus prominentibus; thyrsis ter- 
minalibus, multifloris, pyramidalibus, trichotomis, 5-8 
cm. longis: pedunculis 4-5 cm. longis, hirtello-hispidulis ; 
bracteis subulatis, acutis, 5-6 mim. longis, 1 mm. crassis, 
(96 | 
