Question: While Philadelphus is a genus of about 60 species of shrubs, what genus is the Pachyphytum?

Context paragraphs:
Pachyphytum oviferum: Pachyphytum oviferum (also named "sugaralmond plant" or "moonstone") is a species of plant in the genus "Pachyphytum" .

Pachyphytum: Pachyphytum is a small genus of succulents in the Crassulaceae family, native from Mexico, lands at 600 to high.  The name comes from the ancient Greek "pachys" (=thick) and "phyton" (=plant) because of the shape of the leaves.

Philadelphus: Philadelphus ( ) (mock-orange) is a genus of about 60 species of shrubs from 3-20 ft (1-6 m) tall, native to North America, Central America, Asia and (locally) in southeast Europe.

Cornus: Cornus is a genus of about 30–60 species of woody plants in the family Cornaceae, commonly known as dogwoods, which can generally be distinguished by their blossoms, berries, and distinctive bark.  Most are deciduous trees or shrubs, but a few species are nearly herbaceous perennial subshrubs, and a few of the woody species are evergreen.  Several species have small heads of inconspicuous flowers surrounded by an involucre of large, typically white petal-like bracts, while others have more open clusters of petal-bearing flowers.  The various species of dogwood are native throughout much of temperate and boreal Eurasia and North America, with China and Japan and the southeastern United States particularly rich in native species.

Philadelphus lewisii: Philadelphus lewisii (Lewis' mock-orange)—also known as Gordon's mockorange, Indian arrowwood, wild mockorange (though this can apply to any species in the genus) and syringa—a name that usually refers to the unrelated lilacs.—is a deciduous shrub native to western North America, from northwestern California in the Sierra Nevada, north to southern British Columbia, and east to Idaho and Montana.  It is widespread but not very common, usually appearing as an individual plant amongst other species.  It was first collected by scientist and explorer Meriwether Lewis in 1806 during the Lewis and Clark expedition and the "Philadelphus lewisii" is named after him.

Pachyphytum hookeri: Pachyphytum hookeri is a species of the genus "Pachyphytum" in the family of Crassulaceae.

Eupatorium: Eupatorium is a genus of flowering plants in the aster family, Asteraceae, containing from 36 to 60 species depending on the classification system.  Most are herbaceous perennial plants growing to 0.5–3 m tall.  A few are shrubs.  The genus is native to temperate regions of the Northern Hemisphere.  Most are commonly called bonesets, thoroughworts or snakeroots.  The genus is named for Mithridates Eupator, king of Pontus.

Endlicheria: Endlicheria is a neotropical plant genus consisting of approximately 60 species, occurring mostly in northern South America and the Amazon region.  Most species are medium-sized trees, sometime up to 40 metres in height, but a few species are shrubs.  DNA molecular data shows that it is closely related to "Rhodostemonodaphne" and "Ocotea".

Momordica: Momordica is a genus of about 60 species of annual or perennial climbers herbaceous or rarely small shrubs belonging to the family Cucurbitaceae, natives of tropical and subtropical Africa and Asia and Australia.  Most species produce floral oils and are visited by specialist pollinators in the apid tribe Ctenoplectrini.  A molecular phylogeny that includes all species is available (Schaefer and Renner, 2010).

Mock orange: Mock orange or mock-orange typically means "Philadelphus", a mostly Holarctic genus of shrubs, particularly the species "Philadelphus coronarius" which is widely cultivated as an ornamental.

Supporting paragraphs: Philadelphus Pachyphytum
Answer: a small genus of succulents in the Crassulaceae family