Gaylussacia mosieri, the hirsute huckleberry or woolly huckleberry, is a plant species native to the coastal plains of the southeastern United States (Louisiana, Mississippi, Alabama, Georgia, Florida).
Gaylussacia ursina, the bear huckleberry, is a plant species native to the coastal plains of the southeastern United States, in the southern Appalachians of (Georgia, Tennessee, and the Carolinas).
Gaylussacia dumosa is a species of flowering plant in the heath family known by the common names dwarf huckleberry, bush huckleberry, and gopherberry.
 It is native to eastern North America from Newfoundland to Louisiana and Florida.
 It occurs along the coastal plain and in the mountains.
Gaylussacia orocola, the Blue Ridge huckleberry, is a plant species native to the coastal plains of the southeastern United States (Louisiana, Mississippi, Alabama, Georgia, Florida).
Gaylussacia frondosa is a species of flowering plant in the heath family known by the common names dangleberry and blue huckleberry.
 It is native to the eastern United States, where it occurs from New Hampshire to South Carolina.
Gaylussacia tomentosa, commonly known as the hairy dangleberry or hairytwig huckleberry, is a plant species native to the coastal plains of the southeastern United States (Alabama, Georgia, Florida, the Carolinas).
Gaylussacia is a genus of about fifty species of flowering plants in the family Ericaceae, native to the Americas, where they occur in eastern North America and in South America in the Andes and the mountains of southeastern Brazil (the majority of the known species).
 Common English names include huckleberry (shared with plants in several other genera) and "dangleberry".
Rehmannia is a genus of six species of flowering plants in the order Lamiales, endemic to China.
Rehmannia elata (Chinese foxglove) is a species of flowering plant in the family Orobanchaceae, native to China.
 Growing to 150 cm tall by 50 cm broad, it is an herbaceous perennial with veined, hairy leaves and pink, tubular flowers with darker pink stripes in summer.
 The flowers bear a superficial resemblance to foxgloves, hence the common name "Chinese foxglove", which is also applied to the whole genus.
 However this species is not closely related to the true foxglove ("Digitalis").
Gaylussacia bigeloviana, the bog huckleberry, is a plant species native to the coastal plains of eastern Canada and the eastern United States.
 It grows from Newfoundland to South Carolina.

Question: Which has more species, Rehmannia or Gaylussacia?
Answer: Gaylussacia