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

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

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)

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)

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)

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

v.24:pt.8:no.4(1969)

Ferns and fern allies of Guatemala / Robert G. Stolze.

v.39(1976)

Notes on the flora of Costa Rica, I / [by] William C. Burger.

v.31:no.11(1968)

New taxa and new combinations of Agaricales : (Diagnoses fungorum novorum Agaricalium IV) / Rolf Singer.

n.s. no.21(1989)

Revision of South American Saurauia (Actinidiaceae) / Djaja D. Soejarto.

n.s. no.2(1980)

Pteridophyta of Peru. Rolla M. Tryon, Robert G. Stolze ; with the collaboration of John T. Mickel, Robbin C. Moran.

n.s. no.27(1991)

Ferns and fern allies of Guatemala. Robert G. Stolze ; the genus Elaphoglossum by: John T. Mickel ; the genus Thelypteris by: Alan R. Smith.

n.s. no.6(1981)