Dontostemon integrifolius (L.) Ledeb.

Glandular and eglandular forms of Dontostemon integrifolius, which are frequently found within the same population (see for example, Bunge 1831 (P) and Liu 5430 (NAS)), have variously been treated as independent species or varieties. However, the present authors believe that these variants do not merit formal recognition.

Herbs annual, (2.5-)5-20(-25) cm tall, eglandular or glandular nearly throughout, pubescent, with minute, twisted, simple trichomes mixed with straight ones to 1.5 mm. Stems erect or ascending, simple several branched. Middle cauline leaves sessile, linear, (0.7-)1.5-3 cm × 0.5-1.5 mm, base attenuate, margin entire, ciliate and often pubescent with simple subappressed trichomes, apex subacute. Fruiting pedicels divaricate or rarely ascending, straight, slender, 3-8(-11) mm, pilose. Sepals oblong, 2.5-3.5 × 1-1.5 mm. Petals lilac, broadly obovate, 5-7(-8) × 2-3 mm, apex subemarginate; claw 2.5-4 mm. Filaments of median stamens 2.5-4 mm, united; filaments of lateral stamens 2-3 mm; anthers oblong, 0.7-0.8 mm, apiculate. Ovules 30-50 per ovary. Fruit (0.6-)1.5-2.8(-3.3) cm × 0.9-1.1 mm, glandular or glabrous, straight or slightly curved, divaricate or rarely ascending, torulose, terete, midvein prominent; style 0.5-1 mm; stigma slightly lobed. Seeds brown, oblong, 0.7-0.9 × 0.4-0.5 mm, not margined; cotyledons incumbent or obliquely so. Fl. and fr. Jul-Oct. 2n = 14.

Heilongjiang, Liaoning, Nei Mongol, Ningxia, Shaanxi, Shanxi [Mongolia, Russia].

Open grasslands, meadows, pastures, sandy slopes, dunes; 200-1700 m.

Sisymbrium integrifolium Linnaeus, Sp. Pl. 2: 660. 1753; Andreoskia eglandulosa (de Candolle) de Candolle; A. integrifolia (Linnaeus) de Candolle; Cheiranthus muricatus Weinmann; Dontostemon eglandulosus (de Candolle) Ledebour; D. integrifolius var. eglandulosus (de Candolle) Turczaninow; D. integrifolius var. glandulosus Turczaninow; Hesperis glandulosa Persoon; Sisymbrium eglandulosum de Candolle; Synstemon linearifolius Z. X. An.