This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
Tall biennial or perennial herbs with narrow entire leaves and yellow or orange flowers. Lateral sepals saccate at the base. Pod elongated, roundish or 4-angled; seeds not winged, oblong, in one row. Europe, Asia, and North America. Name from Epvw, to draw blisters.
1, E. Peroffskianum. - This showy annual is a great favourite on account of its deep reddish orange-coloured blossoms and neat habit. From the Caucasus. E. asper, syn. E, Arkansanum, is similar to the last, but with lemon-coloured flowers. E. Marschallianum is another Caucasian species, with bright yellow flowers.