- IPNI Life Sciences Identifier (LSID)
- United States Geological Exploration [sic] of the Fortieth Parallel. Botany. Washington, DC
- Date of Publication
- Sep-Dec 1871
- Family as entered in IPNI
- Am. bor. occ
Watson (p. 248, adnot.), the publishing author, acknowledged Torrey’s contributions for the determinations and descriptions of the relevant taxa.