| Classification | Asteraceae: Riddellia |
| Classification 1 | Asteraceae: Psilostrophe |
| Classification 2 | Asteraceae: Riddellia |
| Classification 3 | Asteraceae: Psilostrophe |
| Classification 4 | Asteraceae: Riddellia |
| Harvard University Herbaria Barcode(s) | 00011495 |
| Type Status | Lectotype |
| Collector | J. G. Cooper |
| Country | United States of America |
| State | California |
| Geography | North America: North America (CA, US, MX) (Region): United States of America: California |
| Locality | Fort Mojave |
| Date Collected | 1861-12-** |
| Habitat | gravelly bank |
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/3b2777a3-91aa-44ad-9226-240c2ccfb881 |
| Harvard University Herbaria Barcode | 00011495 |
| Herbarium | GH |
| Family | Asteraceae |
| Determination | Riddellia cooperi A. Gray |
| Determined by | [A. Gray (scripsit) W. T. Kittredge, 2012] |
| Determination Remarks | [is label name] |
| Annotation Text | n. sp. |
| Family | Asteraceae |
| Determination | Psilostrophe cooperi (A. Gray) Greene |
| Determined by | Heiser, Charles Bixler, Jr. |
| Date Determined | 1944 |
| Family | Asteraceae |
| Determination | Riddellia cooperi A. Gray |
| Determined by | Brown, Roy Curtiss |
| Date Determined | 1973-05-** |
| Annotation Text | LECTOTYPE |
| Family | Asteraceae |
| Determination | Psilostrophe cooperi (A. Gray) Greene |
| Determined by | Brown, Roy Curtiss |
| Date Determined | 1973-05-** |
| Determination Remarks | [is Current name] |
| Family | Asteraceae |
| Type Status | Lectotype |
| Lectotype of | Riddellia cooperi A. Gray |
| Verified by | Kittredge, Walter Tobey |
| Date Determined | 2012 |
| Determination Remarks | [is filed under name] |
| Taxon Reference | (for Riddellia cooperi A. Gray) Proc. Amer. Acad. Arts 1868. 7: 358. |
| Sex | not determined |
| Phenology | NotDetermined |
| Preparation Type | Sheet |
| Preparation Method | Pressed |
