Another Caudiciform Impatiens

This one again coming from the Indo China region, where exactly I am not sure but I was told it was from Laos (unsubstantiated).
The medium size flattened bulb produce a plant with reddish stems and green leaves with a red mid-vein. The whorled arrangements of the leaves, the long racemes and its corky caudex sets it apart from the other more herbaceous Impatiens with Annual growth patterns. While resembling an I. mirabilis, this is quite different in a few ways namely the red stems the scarlet fine roots that appear when it breaks dormancy and scalloped leaves. Also, it is seasonally dormant, dying down to the horizontally flattened tuber annually, which is quite different from a mirabilis which rarely goes dormant unless in severe drought. On top of that, this plant rot so easily in the lowland that I am pretty convinced it is a dryish highland species.

Anyway there appear to be a few new species of caudex-type Impatiens unleashed from this region in recent years, mostly from the limestone hills.... so while we wait for the experts to publish their authoritative findings, I welcome any reports of other fellow grower's experience and observations on this interesting group of plants.