Question: Which genus of flowering plants contains more species, Scaevola or Goldenrod (Solidago)?
Context: Solidago faucibus, the gorge goldenrod, is North American species of flowering plants in the sunflower family.  It was recognized as a distinct species in 2003.  It is found primarily in the southern Appalachian Mountains of the southeastern United States, in the states of Virginia, West Virginia, Kentucky, Tennessee, and South Carolina.  It is found in mesic forested gorges, often growing under "Tsuga canadensis". Solidago uliginosa, or bog goldenrod, is a North American species of flowering plants in the sunflower family.  It is found in eastern Canada (from Nunavut to Newfoundland and Manitoba) and the eastern United States (Great Lakes, Northeast, and Appalachian Mountains as far south as northeastern Georgia.  There are historical reports of the species growing in Alabama, but these populations appear now to have been extirpated). Solidago, commonly called goldenrods, is a genus of about 100 to 120 species of flowering plants in the aster family, Asteraceae.  Most are herbaceous perennial species found in open areas such as meadows, prairies, and savannas.  They are mostly native to North America, including Mexico; a few species are native to South America and Eurasia.  Some American species have also been introduced into Europe and other parts of the world. Solidago rupestris , the rock goldenrod or riverbank goldenrod, is a North American species of flowering plants in the sunflower family.  It is found in the eastern United States, found today in the States of Maryland, Virginia, Kentucky, and Tennessee.  There are historical records of it formerly growing in Indiana and Pennsylvania as well, but these populations now appear to have been extirpated. Solidago curtisii, commonly called Curtis' goldenrod and mountain decumbent goldenrod, is a North American species of flowering plants in the sunflower family.  It is the eastern part of the United States from Pennsylvania to Mississippi and Alabama, primarily in the southern Appalachian Mountains. Solidago speciosa, the showy goldenrod, is a North American species of flowering plants in the sunflower family.  It grows in the province of Ontario in central Canada, as well as in the eastern and central United States (from the Atlantic coast west as far as the Great Plains, so from Maine to Georgia (except Delaware) west as far as Texas, Nebraska, and the Dakotas). Solidago ouachitensis is a North American species of flowering plants in the aster family known by the common name Ouachita Mountain goldenrod.  It has a very limited range, found only in the Ouachita Mountains along the border between Arkansas and Oklahoma in the United States. Solidago rugosa, the wrinkleleaf goldenrod or rough-stemmed goldenrod, is a North American species of flowering plants in the sunflower family.  It is widespread across eastern and central Canada (from Newfoundland to Ontario) and the eastern and central United States (Maine west as far as Wisconsin and Iowa, south to Florida and Texas). Scaevola is a genus of flowering plants in the "Goodenia" family, Goodeniaceae.  It consists of more than 130 tropical species, with the center of diversity being Australia and Polynesia. Solidago elongata, commonly called West Coast Canada goldenrod or Cascade Canada goldenrod, is a North American species of flowering plants in the sunflower family.  It is native to western Canada, western United States, and northwestern Mexico, primarily in British Columbia, Washington, Oregon, California, and Baja California, with a few populations in Nevada and Idaho.  It grows in the Coast Ranges, the Sierra Nevada, the Cascades, and other mountain ranges in the region.
Answer: Scaevola