Classification of the genus Echinocyamus
G. Echinocyamus van Phelsum 1774
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†Echinocyamus bisexus Kier 1968
†Echinocyamus chipolanus Cooke 1942
†Echinocyamus crispus Mazzetti 1893
Echinocyamus huxleyanus Meyer 1886
†Echinocyamus intermedius Hawkins 1922
†Echinocyamus meridionalis Clark and Twitchell 1915
†Echinocyamus parviporus Kier 1964
Echinocyamus parvus Emmonds 1858
†Echinocyamus petalus Kier 1964
†Echinocyamus polymorpha Duncan and Sladen 1883
†Echinocyamus prostratus Nisiyama 1968
Echinocyamus pusillus Müller 1776
†Echinocyamus terminalis Grant and Hertlein 1938
†Echinocyamus texanus Clark and Twitchell 1915
†Echinocyamus vaughani Clark and Twitchell 1915
†Echinocyamus wilsoni Kier 1997
Invalid names: Anaster Sismonda 1841 [synonym]