Chiastophyllum oppositifolium Umbilicus oppositifolius, common names lamb's-tail[1] and gold drop, is a succulent, perennial flowering plant, a species in the genus Umbilicus of the family Crassulaceae.

It is endemic to shady mountain areas in the Caucasus.

[2] It is widely listed under its synonym Chiastophyllum oppositifolium.

It is a hardy, prostrate evergreen growing to 25 cm (10 in) with large fleshy leaves and racemes of tiny, sulphur-yellow flowers.

It has gained the Royal Horticultural Society's Award of Garden Merit.