| Classification | Brassicaceae: Sisymbrium |
| Classification 1 | Brassicaceae: Mostacillastrum |
| Classification 2 | Brassicaceae: Thelypodiopsis |
| Harvard University Herbaria Barcode(s) | 00019738 |
| Type Status | Holotype |
| Collector | L. R. Stanford, K. L. Retherford, S. E. Retherford & R. D. Northcraft |
| Collector number | 570 |
| Country | Mexico |
| State | Coahuila |
| Geography | North America: North America (CA, US, MX) (Region): Mexico: Coahuila |
| Locality | On mountain 18 km. west of Concepcion del Oro |
| Georeference | 24° 54' N, 101° 45' W |
| Date Collected | 1941-07-22 |
| Elevation | 2850 m |
| Habitat | Many bare snadstone outcroppins covered with low brush and herbs |
| Container | Plants of Mexico: State of Coahuila |
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/81ee42b3-7680-4ea7-8f50-71be96733006 |
| Harvard University Herbaria Barcode | 00019738 |
| Herbarium | GH |
| Family | Brassicaceae |
| Type Status | Holotype |
| Holotype of | Sisymbrium retrofractum Rollins |
| Verified by | Kittredge, Walter Tobey |
| Date Determined | 2012 |
| Determination Remarks | [filed under] |
| Taxon Reference | (for Sisymbrium retrofractum Rollins) Rhodora 1957. 59: 66. |
| Family | Brassicaceae |
| Determination | Mostacillastrum retrofractum (Rollins) Al-Shehbaz |
| Determined by | Kittredge, Walter Tobey |
| Date Determined | 2012 |
| Determination Remarks | [current name] |
| Family | Brassicaceae |
| Determination | Thelypodiopsis retrofracta (Rollins) Rollins |
| Determined by | Rollins, Reed Clark |
| Date Determined | 1975 |
| Annotation Text | Holotype |
| Family | Brassicaceae |
| Determination | Sisymbrium retrofractum Rollins |
| Determined by | Rollins, Reed Clark |
| Date Determined | 1957 |
| Annotation Text | Type |
| Family | Brassicaceae |
| Determination | Sisymbrium sp. |
| Determination Remarks | [label name] |
| Sex | not determined |
| Phenology | FlowerAndFruit |
| Preparation Type | Sheet |
| Preparation Method | Pressed |
