This species was originally described as Cotyledon jurgensenii by Hemsley in 1878 but only transferred to Sedum by Reid Moran in Haseltonia 4 (1996). The species is described as variously hispidulous, that is, covered with short, stiff, bristly hairs. It possesses another distinction among the genus Sedum in having n=23, the same number of chromosomes as in the human genome. The foliage is also strongly dimorphic. During winter dormancy, the plant forms compact, spindle-shaped branchlets with tightly appressed, imbricated, ascending leaves. These branchlets can become dislodged and serve as propagules which spill around the parent plant to form colonies. In spring, these take root and elongate into a very different, rather lax succulent. The flowers are white, with five recurved petals and are produced in the fall on elongated summer shoots with spreading leaves. We received it from Myron Kimnach with his collection number 3402. Unfortunately, we never received his field notes with the sequence including this collection. Therefore, we do not have the data that accompanies this number. Perhaps Myron shared this collection with other students of the Crassulaceae and the data is on record somewhere and will find its way to us. In the meantime, we offer rooted plants of HBG 109487, from Myron Kimnach (MK 3402) in 2012. The species is widespread in central Mexico, at 1100-2900m. $10.
Published in the Cactus and Succulent Journal, Vol. 97 (2), Summer 2025