| Classification | Asclepiadaceae: Asclepias | 
| Barcode(s) | 00076149 | 
| Type Status | Isolectotype | 
| Collector | C. Wright | 
| Country | United States of America | 
| State | Texas | 
| Geography | North America: North America (CA, US, MX) (Region): United States of America: Texas: El Paso County: El Paso | 
| Locality | N. Mex. | 
| Remarks | [Field #22, 2nd coll., "19 July 1851, sides of mountains at Frontera" and #297, "6 May 1852, stony hills near Frontera, fl. light purple"] | 
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/c5f17667-0029-4e52-bdf1-d8bec55fbc5d | 
| Harvard University Herbaria Barcode | 00076149 | 
| Herbarium | GH | 
| Family | Asclepiadaceae | 
| Type Status |  Isolectotype | 
| Isolectotype of |  Asclepias macrotis Torrey | 
| Verified by | W. T. Kittredge | 
| Date Determined | 2008 | 
| Determination Remarks | [Lectotype: MO] | 
| Taxon Reference | (for  Asclepias macrotis Torrey) Rep. U.S. Mex. Bound., Bot. 1-20 Apr 1859. 164. | 
| Family | Asclepiadaceae | 
| Determination |  Asclepias macrotis Torrey | 
| Determined by | A. Gray | 
| Determination Remarks | [A. Gray (scripsit)] [current name] | 
| Annotation Text | Syn. Fl. N. Amer. | 
| Sex | not determined | 
| Phenology | Flower | 
| Preparation Type | Sheet | 
| Preparation Method | Pressed | 
| Item Remarks | [mounted with Isosyntype of Parry, 76148] |