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x amecamecanum  Praeger, 1917

Parentage : Sedum praealtum ssp. monticola x S. goldmanii (as Villadia batesii)

Synonym : xSedadia amecamecana  (Praeger pro sp.) Moran (1975)

Distribution : Originally collected on the Trans-Mexican Volcanic Belt by C.A.Purpus on Mount Iztaccihuatl towards Amecameca in January 1906.

Growing on 2500 - 4000 m as a true alpine it is almost hardy and dislikes hot greenhouse conditions.


Description (according to t' Hart & Bleij in IHSP, 2003) :

Glabrous perennial subshrubs with many widely spreading branches and shorter sterile branches, 20 - 30 cm tall.

Leaves alternate, oblanceolate, subacute, reflexed, slightly spurred, flat, 15 - 20 x ± 6 mm, light green.

Flowering branches erect to ascending.

Inflorescences densely cymose to corymbose, bracts sepal-like.

Flowers 5-merous, sepals basally free, shortly spurred, unequal, broadly linear, obtuse, 4 - 6 mm, green, petals basally slightly connate, oblong, subobtuse, shortly mucronate, 8 - 9 mm palse yellow, filaments and anthers yellow.


The hybrid is intermediate between the parents and  according to Clausen sterile or nearly so. Uhl has noted terminal as well as axillary inflorescences. A fairly similar hybrid has been found on 3000 m on Popocatepetl. As only S. praealtum ssp. parvifolium is growing on Popocatepetl the latter might result from S. goldmanii crossed with S. praealtum ssp. parvifolium.

Photo Ray Stephenson

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