modice vel dense armatum; semina 0.7 X0.4-0.5 mm. 
cochleata haud profunde foveolata, cum guttulis rubris. 
Macartrea artrambae and M. scabra both have 8-nerved 
leaves with longer petioles. Other possible relatives are 
Macairea albiflora Cogn. and M. theresiae Cogn., both 
(ex char.) having much larger, longer-petiolate leaves 
with attenuate bases. Another collection probably refer- 
able to Macairea Schultesu is Gutiérrez & Schultes 656 
from the Cerro de Chiribiquete, Rio Macaya, Vaupés, 
Jan. 17, 1944: the specimen of this collection in the 
Herbarium of the New York Botanical Garden is, how- 
ever, sterile. 
Cotomsia: Comisaria del Vaupés, Rio Kuduyari, Cerro Yapoboda. 
Savannahs on quartzite base. Altitude about 450 meters. ‘‘Bush 2-3 
feet tall. Flowers white.’* October 2-6, 1951. Richard Evans Schultes 
& Isidoro Cabrera 14358 (Tyrer in N.Y. Bot. Gard.).—Same locality. 
‘‘Low bush 1-2 feet high. Flowers white.’ October 4-6, 1951. 
Schultes & Cabrera 14250 (US).—Comisaria del Vaupés, Rio Kubiyt 
(tributary of Rio Vaupés), Cerro Kafitienda. Savannahs about 15 miles 
upstream from mouth, Quartzite base. Altitude about 800-900 feet. 
“Shrub. Height 4 feet.’” November 10, 1952. Schultes & Cabrera 
18324 (NY).—Comisaria del Vaupés, Rio Karurt (tributary of Rio 
Vaupés), Mesa de Yambi. Savannah Goo-ran-hoo-da. Quartzite base. 
Altitude about 950-1000 feet. ““Bush. Flowers whitish to pink.”’ 
April 15-16, 1953. Schultes & Cabrera 19146 (US).—Comisaria del 
Vaupés, Rio Parana Pichuna (tributary of Rio Vaupés)., Altitude about 
700 feet. ““Bush. Flowers yellow.’’ June, 1953. Schultes & Cabrera 
19953 (NY ). 
Siphanthera vaupesana JVurdach sp. nov. 
A congeneribus circa Siphanthera Hostmannu differt 
trichomatibus paucissimis eglandulosis. Herba 15-25 cm. 
alta superne multiramosa: ramuli quadrati glabri setis 
brevibus paucis nodosis exceptis. Folia anguste obovato- 
elliptica vel anguste elliptica pauci-serrulata; lamina 4-6 
1.5-2.5 mm. apice acuta basi attenuata uninervia ner- 
vulis secondariis paucis, obscure punctata glabra vel supra 
primum setis paucis brevibus appressis ornata: petiolus 
