BioStor
 | Studies in the Boraginaceae, XXI. Sino-Indian species of Onosma [concl.] I M Johnston (1951) Journal of the Arnold Arboretum 32: 344-368 |
 | Studies in the Boraginaceae, XXVI. Further revaluation of the genera of the Lithospermae I M Johnston (1954) Journal of the Arnold Arboretum 35: 1-81 |