| Classification | Liliaceae: Trillium | 
| Harvard University Herbaria Barcode(s) | 00030144 | 
| Type Status | Isotype | 
| Collector | J. M. Bigelow | 
| Country | United States of America | 
| State | California | 
| Geography | North America: North America (CA, US, MX) (Region): United States of America: California | 
| Locality | Mammoth Grove, [wet ravines] | 
| Date Collected | [[15 May]] | 
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/875dad4a-0be6-4242-906f-8ac0bb50a186 | 
| Harvard University Herbaria Barcode | 00030144 | 
| Herbarium | GH | 
| Family | Liliaceae | 
| Type Status | Isotype | 
| Isotype of | Trillium sessile var. angustipetalum Torrey | 
| Taxon Reference | (for  Trillium sessile var. angustipetalum Torrey) Pacific Railr. Rep. 4, Pt. 5, No. 4 (Whipple) 1857. 151. | 
| Family | Liliaceae | 
| Determination | Trillium angustipetalum (Torrey) J. D. Freeman | 
| Determined by | J. D. Freeman | 
| Determination Remarks | [current name] | 
| Sex | not determined | 
| Phenology | Flower | 
| Preparation Type | Sheet | 
| Preparation Method | Pressed |