短果小柱芥 duan guo xiao zhu jie

Microstigma junatovii Grubov.

Herbs annual, 7-25 cm tall, densely tomentose, glandular or rarely eglandular. Stems erect, simple or branched. Lowerand middle cauline leaves with petioles 0.5-2.2 cm; leaf blade lanceolate, oblanceolate, or obovate, 0.9-2.5(-4) cm × 1.5-8(-20) mm, densely tomentose, base attenuate or cuneate, margin entire or few toothed, apex acute. Fruiting pedicels strongly relexed, thickened, 2-3 mm. Sepals oblong-linear, 5.5-7(-9) × 0.7-1 mm, white margined. Petals creamy white or yellowish, linear, 1-1.5 cm × 0.8-1.5 mm. Median filament pairs 3.5-4 mm, lateral pair 2-2.5 mm; anthers linear-oblong, 1.3-1.6 mm. Ovules 4 per ovary. Fruit narrowly ovoid or ellipsoid, 0.9-1.6 cm × 3-4.5 mm, 4-angled, indehiscent; valves woody, not veined, densely covered with dendritic trichomes with stalks to 1.5 mm, sparsely glandular or eglandular, depressed at middle, strongly thickened at margin; septum leathery; style 3-4 mm. Seeds ovate, 2-2.8 × 1.4-1.6 mm; wing to 0.5 mm wide at distal end, narrower along margin. Fl. May-Jul, fr. Jun-Jul.

Dry mountain slopes; ca. 1900 m. Gansu [Mongolia].

Microstigma junatovii is an eglandular form of M. brachycarpum with slightly broader cauline leaves.