Published in Gard. Chron. 1873: 608 in 1873.
Basionym of Paphiopedilum argus (Rchb.f.) Stein. Pictured in Dict. Icon. Orchid. Cypripedium #5 in 1897. Also published in Bot. Mag. 101: 6175 in 1875.
A very near ally indeed of the old C. barbatum of Java (Tab. nost. 4234), but differing in the very acuminate upper sepal, and the brilliant ocellated markings on the petals, as also in the much larger size, stouter habit, and longer ovary. Also allied to C. purpuratum (Tab. nost. 4901), C. Hookcrte (Tab. nost. 5362), and others, of which the type is the old C. venustum of Wallich (Tab. 2129). All these have a similar habit, tesselated leaves, a broad upper sepal, variously-marked petals, similar sacs to the lip, and a horseshoe-shaped extremity to the column. All are further natives of the hotter parts of India and its Archipelago, and suggest the idea that they are races of one variable species. C. Argus is no doubt much the handsomest of all these ; it was discovered by Mr. Wallis, Messrs. Veitch's collector, in the Island of Luzon, one of the Philippines, and was flowered in Messrs. Veitch's establishment in March of the present year.