P. Holmgren

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Index Herbariorum: A global directory of public herbaria and associated staff

Noel H. Holmgren, P. Holmgren, N. Holmgren, 1998 .

Index Herbariorum. Part I. The herbaria of the world.

P. Holmgren, W. Keuken, 1974 .

A short description of the collections of The New York Botanical Garden Herbarium (NY)

P. Holmgren, B. Thiers, J. Kallunki, 1996, Brittonia.

Intermountain flora. Vascular plants of the Intermountain West, U.S.A. Volume six. The monocotyledons.

P. Holmgren, N. Holmgren, J. L. Reveal, 1978 .

Illustrated Companion to Gleason and Cronquist's Manual: Illustrations of the Vascular Plants of Northeastern United States and Adjacent Canada

P. Holmgren, N. Holmgren, H. Gleason, 1998 .

Additions to Index Herbariorum (Herbaria), Edition 8 - Eleventh Series

P. Holmgren, N. Holmgren, 2002 .

Lectotypification of a name and a new combination in North American Mentzelia (Loasaceae)

P. Holmgren, N. Holmgren, 2004, Brittonia.

Intermountain Flora: Vascular Plants of the Inter-mountain West, U.S.A., volume two, part B. Subclass Dilleniidae

P. Holmgren, N. Holmgren, A. Cronquist, 2005 .

New Mentzelias (Loasaceae) from the Intermountain Region of Western United States

P. Holmgren, N. Holmgren, 2009 .

The Herbaria of the world

P. Holmgren, W. Keuken, E. K. Schofield, 1981 .

ADDITIONS TO INDEX HERBARIORUM, PART I, THE HERBARIA OF THE WORLD, EDITION 7(III)

P. Holmgren, 1983 .

Humboldt, Willdenow, and Polygala (Polygalaceae)

P. Holmgren, N. Holmgren, W. Greuter, 2001 .

Additions to the Herbaria of the World ed. 6. II

P. Holmgren, W. Keuken, 1977 .

ADDITIONS TO “THE HERBARIA OF THE WORLD” ed. 6

P. Holmgren, W. Keuken, 1976 .