Low branching stellate-pubescent annual or perennial herbs, with small racemose yellow or yellowish flowers. Petals entire. Filaments often dilated and toothed or appendaged. Silicle ovate, oblong or orbicular, compressed, its valves nerveless, the septum thin. Stigma nearly entire. Seeds 1 or 2 in each cell of the pod, wingless; cotyledons accumbent. [Greek, curing madness.]

* Originally spelled Konig. Latinized by R. Brown in 1826.

A genus of 100 species or more, natives of the Old World, some of them known as Madwort.Type species: Alyssum montanum L.

4 Alyssum Tourn L Sp Pl 650 1753 354

1. Alyssum Alyssoides L. Yellow Or Small Alyssum

Fig. 2012

Clypeola alyssoides L. Sp. Pl. 652. 1753. Alyssum alyssoides L. Syst. Ed. 10, 1130. 1759.

Alyssum calycinum L. Sp. Pl. Ed. 2, 908. 1763.

Annual, densely erect, simple, or branching from the base, tufted, 3'-10' high. Leaves linear-oblong or spatulate, narrowed at the base, obtuse, entire, 3"-15" long, the lower somewhat petioled; flowers yellowish-white, 1" broad; pedicels spreading or ascending, 2" long in fruit; pods orbicular, 1 1/2" in diameter, margined, minutely pubescent, notched at the apex, tipped with the minute style; sepals persistent around the base of the pod; seeds 2 in each cell; style minute; filaments of the shorter stamens minutely toothed at the base.

In fields, Ontario to Massachusetts, southeastern New York, New Jersey and Iowa, and in ballast about the seaports. Also in the Far West. Naturalized or adventive from Europe. Heal-bite. Heal-dog. Summer.