Chasmanthe
Chasmanthes are winter-growing South African corms related to Gladiolus. They bear double ranks of arching, tubular flowers on tall stems. Since they're winter growers, they need to be grown in a climate no colder than zone 9, or in a greenhouse. In nature, Chasmanthes grow in wet spots on rocky outcrops, where they form small colonies. They prefer sun, but will adapt to partial shade. This genus of 3 species is part of the Cape Flora, a group of plants that live around the cape and nowhere else on earth.
Chasmanthe floribunda grows to twice the height of C. bicolor, or even more. Five-six-foot plants are not unusual. From Cape Provence, it is classed by some as a species of Gladiolus. Flowers spikes to 7' tall bear yellow and scarlet tubes.