I.M.Johnst. and I.M.Johnst., (P. ), ?Proc. Amer. Acad. Arts 71: 70. 1936?, 1936.

I.M.Johnst. and I.M.Johnst., (P. ), ?Proc. Amer. Acad. Arts 71: 77. 1936?, 1936.

(G. ) I.M.Johnst., I.M.Johnst.,, I.M.Johnst., (P. ), I.M.Johnst., (P. ), I.M.Johnst., (G. ), I.M.Johnst.,, I.M.Johnst., (P. ), I.M.Johnst., (P. ), I.M.Johnst., (G. ), I.M.Johnst.,, I.M.Johnst., (P. ), and I.M.Johnst., (P. ), ?Contr. Gray Herb. 85: 110. 1929?, 1929.

I.M.Johnst., I.M.Johnst.,, I.M.Johnst., (P. ), I.M.Johnst.,, I.M.Johnst.,, I.M.Johnst., (P. ), I.M.Johnst.,, I.M.Johnst.,, and I.M.Johnst., (P. ), ?Contr. Gray Herb. 85: 107. 1929?, 1929.

I.M.Johnst., I.M.Johnst., (L. ), I.M.Johnst.,, I.M.Johnst.,, I.M.Johnst.,, and I.M.Johnst., (P. ), ?Contr. Gray Herb. 85: 105. 1929?, 1929.

(P. ) I.M.Johnst. and I.M.Johnst., ?Contr. Gray Herb. 85: 112. 1929?, 1929.