Type. Trinidad. Virgate tree
5 m, corolla green-yellow, forest bank nr. the
summit, Mt. Tocuche (Blanchisseuse Rd., top
of M o m e Bleu), 3-5 Apr 1920, N. L. Britton,
T. E. Hazen & W. Mendelson 1295 (holotype
N Y ).
Chelonanthus arboreus Britton, Bull. Dept. Agric. Trin.
&Tob. 19:230. 1922
Macrocarpaea arborea (Britton) Ewan, Contr. U.S. Natl.
Herb. 29:221. 1948.
Rogersonanthus arboreus, the extra-Guayanan
but closely related member of this assemblage,
originally described under Chelonanthus, is historically
the second species ofthe present alliance
to have been discovered. Britton recognized its
close generic affinity more accurately than did
This Trinidadian element is known to us only
by Britton's type and a fragment oi^'Trin Herb
10128,'' collected by Williams at the type locality
in 1922. From this meager representation very
little can be learned about the population as it
obtains on Mt. Touche. Negligible distinction of
the specimen from the considerably disjunct Rogersonanthus
tepuiensis, as recognized by Ewan
(1948), is allowed here chiefly on historic and
geographic grounds. Maas (1985) placed Chelonanthus
arboreus in synonymy with Irlbachia