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The Planalto Expedition Program

An “Interview” with Howard S. Irwin and William R. Anderson

A Year in Brazil: Marian Irwin's letters 1965-66

The Participants

The Expeditions and Maps

Photographs from Dorothy Irwin

Photographs from William R. Anderson

Photographs from Steven R. Hill

Irwin’s final report to NSF

This Catalogue

Introduction and Search

Project Interns

Related Catalogues

Species of Eastern Brazil Catalogue

Vascular Plant Type Catalogue

Flora and Mycota of Acre, Brazil

For More Information

A Guide for Use of the Virtual Herbarium

Planalto Expeditions

In the following list, the trips are arranged by date. The dates are followed by range of collection numbers (in italics), states visited (in alphabetical order), participants’ names as they appear on labels (in italics), and a link to a map of the collection localities. Howard S. Irwin was the team leader for field work from 1964 through 25 Jan 1972, and William R. Anderson from 30 Jan 1972 through 1975. The collections were assigned numbers in the series of the team leader, with one exception: from 30 Jan—18 Mar 1972, Anderson was team leader, but Irwin’s series was used to number the collections (35072—37197).

Expedition #1 (1 Aug—31 Oct 1964) Map
1—9 Aug; 5001—5054; Maranhão (5052); Pará
H. S. Irwin
13 Aug—31 Oct; 5055—7656; Distrito Federal, Goiás, Mato Grosso, Minas Gerais
H. S. Irwin & T. Soderstrom

[numbers 7657—7799 do not appear in the Planalto fieldbooks]

Expedition #2 (17 Aug—17 Dec 1965) Map
7800—11379; Distrito Federal, Goiás
H. S. Irwin, R. Souza, R. Reis dos Santos

Expedition #3 (5 Jan—23 Jul 1966) Map
5—30 Jan; 11380—12156; Distrito Federal, Goiás
H. S. Irwin, R. Souza, R. Reis dos Santos

31 Jan—6 Jun; 12157—16691; Distrito Federal, Goiás, Mato Grosso
H. S. Irwin, J. W. Grear, R. Souza, R. Reis dos Santos

7 Jun—23 Jul; 16692—18342; Distrito Federal, Goiás, Mato Grosso
H. S. Irwin, R. Souza, R. Reis dos Santos

[numbers 18343—18499 do not appear in the Planalto fieldbooks]

Expedition #4 (13 Jan—31 Mar 1968) Map
18500—21799; Distrito Federal, Goiás, Mato Grosso
H. S. Irwin, [R.] H. Maxwell, D. C. Wasshausen

Expedition #5 (12 Jan—24 Mar 1969) Map
21800—25003; Goiás, Minas Gerais
H. S. Irwin, R. Reis dos Santos, R. Souza, S. F. da Fonsêca

Expedition #6 (21 Jan—30 Mar 1970) Map
21 Jan—8 Feb; 25004—26347; Goiás, Minas Gerais
H. S. Irwin, E. Onishi, S. F. da Fonsêca, R. Souza, R. Reis dos Santos, J. Ramos

18 Feb—30 Mar; 26348—28662; Distrito Federal, Minas Gerais
H. S. Irwin, S. F. da Fonsêca, R. Souza, R. Reis dos Santos, J. Ramos

Expedition #7 (13 Jan—15 Feb 1971) Map
Collections from 1971 had to be re-numbered at some point. Thus, the sequence of collection numbers is not in synch with that of the dates. Throughout the 1971 season, the collectors were assisted by S. F. da Fonsêca, R. Souza, and J. Fonsêca Filho.

13—18 Jan; 30200—30662; Minas Gerais
18 Jan—7 Feb; 28663—29734; Distrito Federal, Minas Gerais
H. S. Irwin, R. M. Harley, E. Onishi

9—10 Feb; 29735—29749; Distrito Federal
10—11 Feb; 33231—33263; Distrito Federal
13 Feb; 33264; Goiás
13—15 Feb; 33265—33274; Bahia
16—20 Feb; 32244—32662; Bahia
20 Feb—7 Mar; 30663—31664; Bahia
7—12 Mar; 31665—31711; Goiás, Distrito Federal
14—19 Mar; 31712—32243; Goiás
19—25 Mar; 32663—33230; Goiás
H. S. Irwin, R. M. Harley, G. L. Smith

[numbers 29750—30199 and 33275—33999 do not appear in the Planalto fieldbooks]

Expedition #8 (13 Jan—18 Mar 1972) Map
Throughout the 1972 season, the collectors were assisted by S. F. da Fonsêca, R. Souza, and J. Fonsêca Filho.

13—25 Jan; 34000—35071; Goiás H. S. Irwin, W. R. Anderson, M. Stieber, E. Y.-T. Lee

30 Jan; 35072—35077; Distrito Federal
2—20 Feb; 35078—36405; Minas Gerais
2—18 Mar; 36406—37151, 37197; Bahia
18 Mar; 37152—37196; Minas Gerais
W. R. Anderson, M. Stieber, J. H. Kirkbride, Jr.

Expedition #9 (3 Mar—16 May 1973) Map
3—25 Mar; 6200—7961; Goiás
28—29 Mar, 7962—7971; Distrito Federal
W. R. Anderson, M. T. Kalin Arroyo, S. R. Hill, R. Reis dos Santos, R. Souza

3—6 Apr, 7972—8327; Goiás
7—22 Apr, 8328—9349; Minas Gerais
23 Apr, 9350—9352; Distrito Federal
W. R. Anderson, P. Fryxell, S. R. Hill, R. Reis dos Santos, R. Souza

24 Apr—3 May; 9353—9666; Goiás
4—7 May; 9667—9916; Mato Grosso
9—16 May; 9917—10474; Goiás
W. R. Anderson, S. R. Hill, R. Reis dos Santos, R. Souza

[numbers 10475—10499 do not appear in the Planalto fieldbooks]

Expedition #10 (4 Feb—4 Apr 1974) Map
4 Feb; 10500; Pará
W. R. Anderson

6 –22 Feb; 10501—11132; Pará
W. R. Anderson, S. G. da Fonsêca, R. Reis dos Santos, R. Souza

13—17 Mar; 11133—11150; São Paulo
19—23 Mar; 11151—11174; Paraná
23—26 Mar; 11175—11182; Mato Grosso
W. R. Anderson [assisted by S. G. da Fonsêca]

4 Apr; 11183; Rio de Janeiro
W. R. Anderson

Expedition #11 (30 Jan—28 Feb 1975) Map
The 1975 collections under Anderson’s series comprise only Malpighiaceae and Leguminosae. Collections of other families were numbered in Hatschbach’s series.

30 Jan—1 Feb; 11184—11202; Rio de Janeiro
W. R. Anderson, R. C. Barneby, B. E. Gates

6—28 Feb; 11203—11624; Distrito Federal, Goiás, Mato Grosso, Minas Gerais
W. R. Anderson, G. Hatschbach, R. C. Barneby, B. E. Gates


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