late dolabriformibus ca. 9 mm. longis refractis. Antherae 
dimidio exsertae lanceolatae ca. 5 mm. longae dorso 
sparsiuscule pilosulae. Ovaril carpella ca. 1 mm. longa; 
nectarlis carnosis basi connatis ovario aequantibus. Fol- 
liculi gracillimi faleati obscure articulati. 
The description of new species of Prestonia upon sus- 
piciously slight characters and from unicate specimens is 
a recurring annoyance. Although Prestonia vaupesana 
is very closely related to P. Lindleyana W oods., to which 
it will key out in my revision of the genus (in Ann. 
Missouri Bot. Gard. 23 (1986) 276), the several collec- 
tions made by Schultes and Cabrera, all from the same 
general area in the valley of the Rio Apaporis, give ample 
evidence of the characters of a natural population. From 
Prestonia vaupesana, P. Lindleyana differs in its some- 
what more coriaceous, oblong- or obovate-elliptic foliage, 
in its shorter inflorescence with stouter peduncles and 
pedicels, and particularly in its rather broadly ovate, 
more substantial calyx lobes which, with the pedicels, 
are prominently suffused with purple. 
Cotomsia: Comisaria del Vaupés, Rio Apaporis, Cachivera de Jiri- 
jirimo y alrededores. Altitude about 250 m. September 16, 1951. 
Richard Evans Schultes & Isidoro Cabrera 14039 (Tyrer in Mo. Bot. 
Gard.).—Rio Apaporis, Soratama above mouth of Rio Kananari and 
vicinity. Altitude about 900 ft. January 1952. Schultes & Cabrera 
19611.—Rio Apaporis, Raudal Yayacopi (La Playa) and vicinity. 
Altitude about 800 ft. August 18, 1952. Schultes & Cabrera 1697 4.— 
Rio Apaporis entre el Rio Pacoa y el Rio Kananari. Altitude about 
250m. July 5, 1951. Schultes & Cabrera 12893. 
Tabernaemontana rimulosa Woodson sp. nov. 
Fruticulus humilis, ramulis crassiusculis juventate 
glabris mox cortice tenui griseo-fulvo longitudinaliter 
exfoliato tectis. Folia decussata subsessilia in paribus 
aequalibus; lamina anguste oblongo-elliptica apice acuta 
basi more subpetiolato gradatim decurrente 12-13 cm. 
longa, 3-3.7 cm. lata coriacea margine leviter revoluta 
[ 179 ] 
