| Classification | Rosaceae: Crataegus | 
| Harvard University Herbaria Barcode(s) | 00017559 | 
| Type Status | Syntype | 
| Collector | C. S. Sargent | 
| Collector number | 13 | 
| Country | United States of America | 
| State | Massachusetts | 
| Geography | North America: North America (CA, US, MX) (Region): United States of America: Massachusetts: Worcester County: West Boylston | 
| Date Collected | 1900-05-25 | 
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/aa7f5a68-92c5-44fa-abec-8adedb017cf2 | 
| Harvard University Herbaria Barcode | 00017559 | 
| Herbarium | A | 
| Family | Rosaceae | 
| Type Status | Syntype | 
| Syntype of | Crataegus thayeri Sargent | 
| Verified by | D. E. Boufford | 
| Determination Remarks | [filed under] | 
| Taxon Reference | (for  Crataegus thayeri Sargent) Rhodora 1903. 5: 113. | 
| Sex | not determined | 
| Phenology | Flower | 
| Preparation Type | Sheet | 
| Preparation Method | Pressed |