Edward Stuart Cardinal Dyke, son of Daniel J. Dyke and his wife Catherine Wynne-Dyke, was a British subject. He worked as a clerk in the Engineer's Department of the Cape Government Railways from August 1889 to at least 1910. His post was in the Midland System of the railways and in 1898 and 1899 he was stationed in Port Elizabeth. During the Anglo-Boer War (1899-1902) he was on active service. By 1905 he had been transferred to the Western System of the railways. After the formation of the Union of South Africa in 1910 he worked for the South African Railways in Johannesburg. During Wold War I (1914-1918) he was a trooper in the Imperial Light Horse and died of wounds near Swakopmund. He was not married.
Dyke was a plant collector, mountaineer, and photographer. He collected plants in the Cape Colony, the Transvaal and Lesotho, sending specimens to H.W. Rudolf Marloth*. In the Coxcomb Mountains near Uitenhage he found a new species of Protea that was named Protea dykei, but which later became a synonym of Protea rupicola. On Matroosberg, north-west of Worcester, he discovered a species of everlasting flower that was named Helichrysum dykei by H.M.L. Bolus* (later renamed Syncarpha dykei). Other species named after him by Bolus were Lessertia dykei and Erica dykei. He also cultivated wild plants from the Karoo in his garden. The specimens he collected ended up in the National Herbarium in Pretoria as part of Marloth's herbarium. Marloth praised the quality of his landscape and botanical photography and published many of Dyke's photographs in his Flora of South Africa (1913-1915).