An evaluation of the genus Poteranthera.

v.29:no.9(1963)

Flora of Guatemala / by Paul C. Standley and Louis O. Williams.

v.24:pt.11:no.1-3(1975)

Contributions to the flora of Venezuela : from Droseraceae through Umbelliferae / Julian A. Steyermark and collaborators.

v.28:no.2(1952)

Contributions to the flora of Venezuela / Julian A. Steyermark and collaborators.

v.28:no.4(1957)

An overlooked genus of the Scrophulariaceae / Louis O. Williams.

v.32:no.14(1970)

A taxonomic and phytogeographic study of Brunswick Peninsula (Strait of Magellan) Hepaticae and Anthocerotae / John J. Engel.

v.41(1978)

Two new species of palms from Nicaragua [by] S. F. Glassman.

v.31:no.1(1964)

Revision of Lagascea (Compositae, Heliantheae) / Tod F. Stuessy.

v.38:no.8(1978)

Flora of Guatemala / Paul C. Standley and Louis O. Williams.

v.24:pt.9:no.1-2(1970)

Flora of Guatemala : families Leguminosae, Geraniaceae, Oxalidaceae, Tropaeolaceae, Linaceae, Erythroxylaceae, Zygophyllaceae, Rutaceae, Simaroubaceae, Burseraceae, Meliaceae, and Malpighiaceae / by Paul C. Standley and Julian A. Steyermark.

v.24:pt.5(1946)

New species of Digitaria, Pennisetum, and Poa (Gramineae) from Costa Rica / Richard W. Pohl.

v.38:no.2(1976)

Comprehensive index to the Flora of Guatemala / Terua P. Williams.

v.24:pt.13(1977)

Flora of Guatemala / Paul C. Standley, Louis O. Williams, Dorothy Nash Gibson.

v.24:pt.10:no.3-4(1974)

Tropical American Myrtaceae; notes on generic concepts and descriptions of previously unrecognized species.

v.29:no.3(1956)

Orchids of Peru / Charles Schweinfurth.

v.30:no.1(1958)