The species Euphorbia heterophylla is an annual with ovate, sometimes variegated leaves and small flowers surrounded with scarlet bracts.  To 90cm.  [RHSD, Hortus].  The variety cyathophora, described nearly 100 years before the type, varies from the type ‘not only in its mostly pandurate [fiddle-shaped] leaves (the floral ones commonly purplish- or reddish-splotched) but in its more rounded, ecarinate [keelless] seeds’.  [Annals of the Missouri Botanic Garden vol.25 p.72/1938].