Question: Disanthus and Elaeagnus are what?
Context: Elaeagnus macrophylla, the broad-leaved oleaster, is a species of "Elaeagnus" native to Eastern Asia. Elaeagnus angustifolia, commonly called Russian olive, silver berry, oleaster, Persian olive, or wild olive, or commonly referred to as "senjid" or "sinjid" in Afghanistan and "senjed" in Iran, is a species of "Elaeagnus", native to western and central Asia, Afghanistan, from southern Russia and Kazakhstan to Turkey and Iran.  It is now also widely established in North America as an introduced species. Desert riparian is a North American desert vegetation type (or biome) occurring in the bottoms of canyons and drainages that have water at or near the surface most of the year.  It is contrasted with the desert dry wash vegetation type in which water at or near the surface is lacking most of the year.  The visual character is of large, lush green trees surrounded by dry desert vegetation and soil coloration.  The area may be in a patch surrounding a spring (oasis), or in a strand following the course of water flow.  Over 80% of known desert wildlife species use desert riparian areas.  Common dominant species include Fremont cottonwood ("Populus fremontii"), Arizona ash ("Fraxinus velutina"), arroyo willow ("Salix lasiolepis"), Goodding's willow ("Salix gooddingii"), red willow ("Salix laevigata"), California fan palm ("Washingtonia filifera"), and invasive species such as salt cedar ("Tamarix ramosissima"), giant reed ("Arundo donax"), and Russian olive ("Elaeagnus angustifolia").  Salt cedar is particularly causing problems for this ecosystem because it is able to extract water more efficiently than cottonwoods and willows.  Many noninvasive non-native species may also be found because springs and surface water areas in the desert often were old homesites where such species were intentionally planted, such as elm, black locust, and assorted fruit trees. Elaeagnus , silverberry or oleaster, is a genus of about 50–70 species of flowering plants in the family Elaeagnaceae. Elaeagnus tonkinensis is a species of "Elaeagnus" found in Southeast Asia Elaeagnus multiflora, the cherry elaeagnus, cherry silverberry, goumi, gumi, or natsugumi, is a species of "Elaeagnus" native to China, Korea, and Japan. Elaeagnus umbellata is known as Japanese silverberry, umbellata oleaster, autumn olive, autumn elaeagnus, or spreading oleaster.  The species is indigenous to eastern Asia and ranges from the Himalayas eastwards to Japan.  Because it fixes atmospheric nitrogen in its roots, it often grows vigorously and competitively in infertile soils. Elaeagnus commutata, the silverberry or wolf-willow, is a species of "Elaeagnus" native to western and boreal North America, from southern Alaska through British Columbia east to Quebec, south to Utah, and across the upper Midwestern United States to South Dakota and western Minnesota.  It typically grows on dry to moist sandy and gravel soils in steppes, meadows or woodland edges. Ceraceopsora is a genus of rust fungi in the Chaconiaceae family.  The genus is monotypic, containing the single species Ceraceopsora elaeagni, found in Japan growing on "Anemone flaccida" and "Elaeagnus umbellata". Disanthus is a genus containing two species of flowering plants in the family Hamamelidaceae.  The type species, "Disanthus cercidifolius", was the only known species until 2017, when a second species, "Disanthus ovatifolius" was described.
Answer: a genus containing two species of flowering plants