Stems. - Mucilaginous, leafy, mostly upright. Leaves. - Linear, keeled. Flowers. - Blue, clustered, with floral leaves as in the day-flower. Calyx. - Of three sepals. Corolla. - Of three petals. Stamens. - Six, with bearded filaments. Pistil. - One.

The flowers of the spiderwort, like those of the day-flower, to which they are nearly allied, are very perishable, lasting only a few hoars. They are found throughout the summer, somewhat south and westward. The genus is named in honor of Trades-cant, gardener to Charles I. of England.