Question: Which plant has more species, Aquilegia or Larrea?
Context: The "Asphondylia auripila" group (Diptera: Cecidomyiidae) consists of 15 closely related species of gall-inducing flies which inhabit creosote bush (Zygophyllaceae: "Larrea tridentata").  They have partitioned the plant ecologically with different gall midge species inhabiting the leaves, stems, buds, and flowers of creosote bush.  Each species induces a uniquely shaped gall but the insects are otherwise morphologically very similar and very difficult to tell apart.  Their life cycle begins when the female oviposits into the part of the plant which her species prefers, she inserts her egg along with a fungal spore from a mycangia (a small pocket to store fungal spores).  A gall forms and the fungal mycelium grows to line the inside of the gall, when the egg hatches the developing larva feeds upon the fungus.  Adult emergence is timed with periods of plant growth associated with winter, spring, or summer rain fall.  In contrast to many other groups of plant-feeding insects (which form new species through changes to new host plants) the evolution of new species in the "A. auripila" group seems to be a result of colonizing new parts of the same plant and/or colonization of new seasons of plant growth. Red columbine can refer to any red-flowered species in the flowering plant genus "Aquilegia", especially: Aquilegia nuragica, commonly called Nuragica columbine, is a species of plant in the Ranunculaceae family.  It is endemic to Italy, on the island of Sardinia. Aquilegia bertolonii, common name Bertoloni columbine, is a species of flowering plant in the family Ranunculaceae, native to Southern France and Italy.  Growing to 30 cm in height, it is an alpine herbaceous perennial.  In early summer each erect stem produces up to four spurred, blue-purple flowers. Larrea is a genus of flowering plants in the caltrop family, Zygophyllaceae.  It contains five species of evergreen shrubs that are native to the Americas.  The generic name honours Bishop J.A. Hernández Pérez de Larrea, a patron of science.  South American members of this genus are known as jarillas and can produce fertile interspecific hybrids.  One of the more notable species is the creosote bush ("L. tridentata") of the southwestern United States and northwestern Mexico.  The King Clone ring in the Mojave Desert is a creosote bush clonal colony estimated to be 11,700 years old. Aquilegia barbaricina (also called barbaricina columbine) is a species of plant in the Ranunculaceae family.  It is endemic to Italy, occurring only on the island of Sardinia. Aquilegia grahamii is a species of flowering plant in the buttercup family known by the common name Graham's columbine.  It is endemic to Utah in the United States, where it is known only from Uintah County.  It occurs in three canyons along the Uinta Mountains.  There are an estimated 5,000 to 10,000 individuals. Aquilegia (common names: granny's bonnet or columbine) is a genus of about 60-70 species of perennial plants that are found in meadows, woodlands, and at higher altitudes throughout the Northern Hemisphere, known for the spurred petals of their flowers. Aquilegia flabellata, common name fan columbine or dwarf columbine, is a species of flowering perennial plant in the genus "Aquilegia" (columbine), of the family Ranunculaceae. Aquilegia grata is a species of "Aquilegia" native to Serbia, Montenegro and Bosnia.  It is a herbaceous perennial plant growing to 0.8 m tall, with branched, thinly hairy stems.  The leaves are pinnate, with the basal leaflets themselves trifoliate.
Answer: Larrea