Annual herb, 0.15-0.50 m high, slender or stout, erect, simple or branched, mostly glabrous, puberulous for the first few nodes, axils of lower branches, upper surface of leaves and lower part of pedicels. Leaves mostly in lower half of stem, simple or 3-lobed near the tip, filiform or linear; upper leaves few, smaller, simple. Inflorescence a raceme. Flowers blue, deep blue, pale pink. Sepals linear-oblong; outer 2 cucullate, apex thickened or horn-tipped; inner 2 saccate. Petals oblong-obovate or elliptic-obovate, rounded, each with a small appendage. Fruit linear, shallowly moniliform.
Like H. bulbostyla but buds narrow and pointed. Flowers pink to blue and fruiting pedicels adpressed-erect.