For more than a century, Navia acaulis was known 
only from the type collection made by Martius in Ara- 
racuara on the Rio Caqueta. Recently, several additional 
collections have been made in eastern Colombia which 
extend the known range of this interesting species. In 
Caldasia 5 (1942) 8, Dr. L. B. Smith reported the second 
collection which was made by Cuatrecasas on the gran- 
itic ridges at San José del Guaviare (Cuatrecasas 7707). 
This represents a considerable range extension north- 
ward. Later, Navia acaulis was discovered and collected 
on several of the sandstone mountains of the Upper Ap- 
aporis Basin; these collections are cited below. It is an 
interesting ecological note that Cuatrecasas found Navia 
acaulis growing on granitic terrain at San José (where 
sandstone also occurs), whereas at both the type locality 
at Araracuara and on the Apaporis mountains, the plant 
is endemic on quarzite ridges. 
CotomBia: Vaupés, Upper Apaporis Basin, Ajaju River, Mount 
Campana, sandstone shelf at base of mountain, alt. 900-1500 feet 
above sea-level, June 1—6, 1943, R. E. Schultes 5570. Caqueta, upper 
Apaporis Basin, Apaporis River, Mount Castillo (10 km. below Ajaju- 
Macaya confluence), sandstone, xerophytic conditions, shady crevasses 
and faults, alt. 350-1000 ft. above forest floor, July 27, 1943, R. E. 
Schultes 5656. 
Navia bicolor L. B. Smith sp. nov. 
Subacaulis, solitaria vel 6-7 aggregatae; foliis multis, 
dense rosulatis, 9-14 cm. longis, vaginis quam laminis 
paulo latioribus, omnino occultatis ; laminis lineari-oblon- 
gis, acutis vel acuminatis, 15-19 mm. latis, supra glabris 
viridibusque, in sicco nervatis, subtus dense adpresseque 
albo-lanatis, margine densissime minuteque serrulatis sed 
prope apicem integris; scapo ad 8 cm. longo, glabro; in- 
florescentia dense capituliformi sed spicis apices versus 
distinctis, bracteis exterioribus paulo floccosis exceptis 
glabra, ad 35 mm. diametro; bracteis florigeris late 
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