西藏沟子荠 xi zang gou zi ji

Dipoma tibeticum O. E. Schulz, Repert. Spec. Nov. Regni Veg. 38: 32. 1935.

Herbs, 4-12 cm, densely hirsute with simple trichomes 0.5-1 mm. Root conical, slightly fleshy, base with a whorl of oblong, scalelike leaves to 5 × 2 mm. Stems erect, 1-3 from fleshy root, lowermost leafless part 1-9 cm. Leaves densely hirsute, not fleshy, lowermost cauline verticillate, others opposite or alternate; petioles 3-5 mm, gradually shorter upward, densely hirsute; leaf blade oblong or spatulate, 4-7 × 1-3 mm, gradually reduced in size upward, base attenuate, margin entire or 2-toothed, apex retuse. Racemes densely flowered, elongated slightly in fruit, bracteate throughout; bracts leafy, smaller than cauline leaves, hirsute; rachis retrorsely or spreading hirsute. Fruiting pedicels hirsute, slender, straight, 3-6 mm. Sepals oblong, 1.7-2.5 × 1-1.5 mm, distal margin and apex membranous, ciliolate with trichomes to 0.1 mm, densely hirsute outside with trichomes ca. 0.5 mm. Petals white, broadly obovate, 4.5-5 × 2.5-3 mm, attenuate to clawlike base to 1.5 mm, apex emarginate. Filaments white, 2-2.5 mm, slightly dilated at base; anthers broadly ovate, ca. 0.5 mm. Ovules 4-6 per ovary. Immature fruit ovate, apparently latiseptate; valves membranous, densely puberulent; replum widely and evenly expanded throughout; septum absent; style subconical, 1-1.5 mm. Immature seeds oblong, ca. 1 mm, foveolate. Fl. Jun-Jul.

* Stony slopes, turf, earth slides, shale along streamsides; 4200-5000 m. Xizang.