1. Lepyrodiclis holosteoides (C. A. Meyer) Fenzl ex Fischer & C. A. Meyer, Enum. Pl. Nov. 1: 93, 110. 1841.
Gouffeia holosteoides C. A. Meyer, Verz. Pfl. Casp. Meer., 217. 1831
Stems 40-100 cm, glabrous or papillate. Leaf blades 1-8 × 0.3-1 cm, margins glandular-dentate. Flowers: sepals 4-5 mm; petals 1-1.5 times as long as sepals. Capsules globose-ovoid, 3 mm, shorter than calyx. Seeds 1.8-2 mm. 2n = 34, 68 (both Asia).
Flowering spring. Disturbed areas, pea and wheat fields; 500-800 m; introduced; Idaho, Wash.; c, sw Asia; introduced in Europe (Germany), Asia (Japan).
Although known in North America only since 1959, Lepyrodiclis holosteoides is a serious menace in pea and wheat plantings, where it grows quickly and often overtops the crops. It is listed as a noxious weed in Washington and Oregon; I am not aware of any documented occurrences in Oregon.
If Lepyrodiclis stellarioides Schrenk ex Fischer & C. A. Meyer is included as a variety of L. holosteoides (see Y. P. Kozhevnikov 1985), North American plants are var. holosteoides