| Classification | Asteraceae: Ambrosia |
| Harvard University Herbaria Barcode(s) | 00000820 |
| Type Status | Holotype |
| Collector | I. M. Johnston |
| Collector number | 9400 |
| Country | Mexico |
| State | Coahuila |
| Geography | North America: North America (CA, US, MX) (Region): Mexico: Coahuila |
| Locality | Calcareous southeastern foothills of the Sierra de las Cruces. Puerto de San Jose. |
| Date Collected | 1941-09-26 |
| Habitat | common locally about tanque [?] |
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/d2c37979-2d97-47a2-95f6-9b9eb487230d |
| Harvard University Herbaria Barcode | 00000820 |
| Herbarium | GH |
| Family | Asteraceae |
| Type Status | Holotype |
| Holotype of | Ambrosia johnstoniorum Henrickson |
| Verified by | V. M. Bates |
| Date Determined | 1984 |
| Taxon Reference | (for Ambrosia johnstoniorum Henrickson) Brittonia 1980. 32: 340. |
| Family | Asteraceae |
| Type Status | Holotype |
| Holotype of | Ambrosia johnstoniorum Henrickson |
| Verified by | J. S. Henrickson |
| Date Determined | 1980-05-** |
| Taxon Reference | (for Ambrosia johnstoniorum Henrickson) Brittonia 1980. 32: 340. |
| Family | Asteraceae |
| Determination | Ambrosia johnstoniorum Henrickson |
| Determined by | J. Henrickson |
| Date Determined | 1980-05-** |
| Determination Remarks | [current name] |
| Sex | not determined |
| Phenology | NotDetermined |
| Preparation Type | Sheet |
| Preparation Method | Pressed |
