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

v.24:pt.9:no.3-4(1973)

Tropical American plants, X / Louis O. Williams.

v.32:no.4(1968)

Tropical American plants, XI / Louis O. Williams.

v.32:no.12(1970)

Flora Costaricensis / William Burger, editor.

v.40(1977)

Flora of Guatemala / Dorothy L. Nash, Louis O. Williams ; genera contributed by Kenneth M. Becker ... [et al.].

v.24:pt.12(1976)

New species in the palm genus Syagrus Mart., II / [by] S.F. Glassman.

v.31:no.13(1968)

Revision of the genus Vascellum (Lycoperdaceae).

v.32:no.9(1970)

Studies in American plants, II / Dorothy N. Gibson.

v.32:no.11(1970)

Studies in the palm genus Syagrus Mart. [by] Sidney F. Glassman.

v.31:no.17(1968)

A taxonomic revision of the genus Cnemidaria (Cyatheaceae) / Robert G. Stolze.

v. 37(1974)

New species in the palm genus Syagrus Mart. / S.F. Glassman.

v.31:no.9(1967)

A new Eurystyles from Nicaragua [by] Alfonso H. Heller.

v.31:no.12(1968)

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)