There were 2 illustrations found for C. Johnston
Tontelea sp.J.C. Mutis, Draw. Roy. Bot. Exped. Granada: t. 2362 (1783)
0Adansonia, sér. 2, vol. 17(4): : p. 411, t. 7 (1977) [N. Hallé]
224117 Cerastium pedunculare Bory & Chaub.Mag. Zool. Bot., vol. 2 : t. 6 (1837-1838)
223639 Cerastium diffusum Pers.Mag. Zool. Bot., vol. 2 : t. 9 (1837-1838)