Sedum paradisum ( Denton 1978: 236 ) Denton ex B. L. Wilson, 2018

Zika, Peter F., Wilson, Barbara L., Brainerd, Richard E., Otting, Nick, Darington, Steven, Knaus, Brian J. & Nelson, Julie Kierstead, 2018, A review of Sedum section Gormania (Crassulaceae) in western North America, Phytotaxa 368 (1), pp. 448-450 : 448-450

12. Sedum paradisum ( Denton 1978: 236) Denton ex B. L. Wilson , stat. nov.

Sedum obtusatum Gray (1868: 342) subsp. paradisum Denton (1978: 236) (basionym). Sedum obtusatum A.Gray var. paradisum (Denton) Ohba (2007: 889) .

Type: — UNITED STATES. California: Trinity County, Trinity National Forest, Salmon Trinity Alps Primitive Area, 4 miles N of trailhead on trail to Canyon Creek Lakes, or ca. 8 miles N of Dedrick , 1340 m, 17 June 1977, M . F . Denton 4097 (holotype, WTU; isotype, NY) .

Denton (1993: 534) inadvertently published Sedum paradisum at species rank as a nomen nudum; here we validate the name with reference to the basionym.

We treated Sedum paradisum as two geographic subspecies. Between their ranges lies Lassen Peak and a large area affected by its eruptions. Appropriate habitat for Sedum is limited in this area because most rock outcrops were recently exposed and excessively dry. We hypothesize that any Sedum paradisum once present in this area was killed by the eruptions of Lassen Peak in 1914, or in previous volcanic episodes dating back 27,000 years.