Thlaspi yunnanense var. dentatum Diels.

Herbs perennial, (4-)8-25(-30) cm tall, glabrous throughout. Stems erect or ascending, simple. Basal leaves rosulate; petiole (0.1-)0.5-1.5(-2.5) cm; leaf blade oblong, spatulate, ovate, or suborbicular, 3-10(-15) × 2-5(-10) mm, base obtuse, margin entire, repand, or dentate, apex rounded. Middle cauline leaves sessile, oblong, ovate, or suborbicular, 0.5-1.8(-2.5) cm × (2-)4-7(-10) mm, base auriculate, margin dentate or denticulate, rarely repand or entire, apex rounded, obtuse, or subacute. Fruiting pedicels (2-)4-7(-10) mm, slender, divaricate, straight or slightly recurved. Sepals oblong, 1.5-2 × 0.8-1.2(-1.5) mm, not saccate, margin white. Petals lavender, purplish, or rarely white, spatulate, (3-)3.5-4.5(-5.5) × (1-)1.5-2.2(-3) mm, apex rounded. Filaments 1-2 mm; anthers ovate, 0.4-0.5 mm. Ovules 14-18 per ovary. Fruit oblong to oblong-linear, (0.8-)1-1.4(-1.6) cm × 1.5-2.3(-3) mm, base obtuse, apex retuse and apical notch 0.1-0.4 mm deep, or obtuse and apical notch obsolete; apical wings obsolete or rarely to 0.3 mm wide; style 0.5-1(-1.5) mm. Seeds dark brown, ovoid, 0.9-1.3 × 0.6-0.8 mm, obscurely reticulate. Fl. late May-Aug, fr. Jul-Sep.

The type collections of Thlaspi yunnanense and T. yunnanense var. dentatum are indistinguishable in every aspect except for the size of leaf teeth, a feature that is highly variable within any given collection. The apical notch of the fruit can also be variable: in the type collection of T. yunnanense it ranges from obsolete to 0.4 mm deep.

Thlaspi yunnanense is recorded here for the first time from Xizang, based on Ludlow, Sherriff & Taylor 4163 (BM).

Presently treated by Ihsan Al-Shehbaz as Noccaea yunnanensis (Franchet) Al-Shehbaz (Adansonia 24(1): 91. 2002).

* Grassy slopes, pastures, meadows, scree; 3200-5100 m. Sichuan, Xizang, Yunnan.