- IPNI Life Sciences Identifier (LSID)
- Account of an expedition from Pittsburgh to the Rocky Mountains, performed in the years 1819, 1820 by order of the Hon. J. C. Calhoun, secretary of War, under the command of Maj. S. H. Long / compiled from the notes of Major Long, Mr. T. Say and other gentlemen of the party by Edwin James, botanist and geologist for the Expedition.
- 2: 345
- Family as entered in IPNI
- Am. bor. occ
specific epithet appears as coerulea in Philadelphia issue and as caerulea in London issue of this publication. The type specimen at NY shows the epithet as coerulea.