| Classification | Rosaceae: Crataegus | 
| Harvard University Herbaria Barcode(s) | 00016630 | 
| Type Status | Syntype,  Lectotype | 
| Collector | E. J. Palmer | 
| Collector number | 1933 | 
| Country | United States of America | 
| State | Missouri | 
| Geography | North America: North America (CA, US, MX) (Region): United States of America: Missouri: Jasper County: Joplin | 
| Date Collected | 1909-05-08 | 
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/ac476e81-2247-4927-870c-290dabcc37d7 | 
| Harvard University Herbaria Barcode | 00016630 | 
| Herbarium | A | 
| Family | Rosaceae | 
| Type Status | Syntype | 
| Syntype of | Crataegus paradoxa Sargent | 
| Verified by | D. E. Boufford | 
| Date Determined | 1987 | 
| Determination Remarks | (but date cited as 1908 in protologue) | 
| Taxon Reference | (for  Crataegus paradoxa Sargent) Rep. (Annual) Missouri Bot. Gard. 1912. 22: 68. | 
| Family | Rosaceae | 
| Type Status | Lectotype | 
| Lectotype of | Crataegus paradoxa Sargent | 
| Verified by | J. B. Phipps (UWO) & G. Yatskievych (MO) | 
| Date Determined | 2003 | 
| Taxon Reference | (for  Crataegus paradoxa Sargent) Rep. (Annual) Missouri Bot. Gard. 1912. 22: 68. | 
| Family | Rosaceae | 
| Determination | Crataegus crus-galli var. capillata Sargent | 
| Determined by | J. B. Phipps (UWO) & G. Yatskievych (MO) | 
| Date Determined | 2003 | 
| Determination Remarks | [current name] | 
| Annotation Text | Note discrepancy between coll. date and protologue (1908) | 
| Family | Rosaceae | 
| Determination | Crataegus regalis var. paradoxa (Sargent) Beadle | 
| Determined by | E. J. Palmer | 
| Date Determined | 1947-04-30 | 
| Sex | not determined | 
| Phenology | Flower | 
| Preparation Type | Sheet | 
| Preparation Method | Pressed |