Question: Which plant has more species, Ruta or Tobacco?
Context: Lobelia nicotianifolia is a species of flowering plant with a distribution primarily across India and Sri Lanka.  It is commonly called wild tobacco, because the leaves resemble tobacco leaves.  It is a poisonous plant. Nicotiana sylvestris is a species of the genus "Nicotiana", known by the common names woodland tobacco, flowering tobacco, and South American tobacco.  It is a perennial plant in the tobacco genus "Nicotiana". Ruta (commonly known as rue) is a genus of strongly scented evergreen subshrubs, 20–60 cm tall, in the family Rutaceae, native to the Mediterranean region, Macaronesia and southwest Asia.  There are perhaps 8 to 40 species in the genus.  The most well-known species is "Ruta graveolens" (rue or common rue). Nicotiana langsdorffii, Langsdorff's tobacco, is a species of the "Nicotiana" genus (tobacco).  It is an annual plant with large leaves (up to 10 inches long) with tall 2 inch nodding long tubular bell shaped flowers that are apple green in colour, with blue anthers.  "N. langsdorfii" lacks fragrance unlike some of the other tall species.  It is grown as an ornamental garden plant. Valeriana edulis (tobacco root, edible valerian), a species in the Caprifoliaceae family, is a dioecious perennial flowering plant native to western and central North America.  Despite its common name, tobacco root is not closely related to tobacco, but is instead more closely related to elderberry, honeysuckle, and teasel (Caprifoliaceae s.l.). Tobacco is a product prepared from the leaves of the tobacco plant by curing them.  The plant is part of the genus "Nicotiana" and of the Solanaceae (nightshade) family.  While more than 70 species of tobacco are known, the chief commercial crop is "N. tabacum".  The more potent variant "N. rustica" is also used around the world. Nicotiana glutinosa is a species of tobacco plant that is economically important in tobacco hybrids.  "N. glutinosa" is native to western South America, including Bolivia, Ecuador, and Peru.  It is a model organism for the study of Tobacco Mosaic Virus resistance in tobacco. Tomato ringspot virus (ToRSV) is a plant pathogenic virus of the family "Secoviridae".  It affects species of cucumber, tobacco, tomato, cowpea, among others.  It causes ringspots in tobacco plants and raspberries, yellow bud mosaic in peaches, yellow vein in grapes, and stunted growth in "gladiolus" and "Narcissus".  Its range is in the temperate regions of North America, especially where its vector, "Xiphinema americanum" is present.  Along with the adult and larval stages of this nematode, the virus is also spread by seed.  This type of infection is more common in strawberries and soybeans than any other susceptible plant. Ruta graveolens, commonly known as rue, common rue or herb-of-grace, is a species of "Ruta" grown as an ornamental plant and herb.  It is native to the Balkan Peninsula.  It is now grown throughout the world in gardens, especially for its bluish leaves, and sometimes for its tolerance of hot and dry soil conditions.  It is also cultivated as a medicinal herb, as a condiment, and to a lesser extent as an insect repellent. Manduca quinquemaculata, the five-spotted hawkmoth, is a brown and gray hawk moth of the family Sphingidae.  The caterpillar, often referred to as the tomato hornworm, can be a major pest in gardens.  Tomato hornworms are closely related to (and sometimes confused with) the tobacco hornworm ("Manduca sexta").  This confusion arises because caterpillars of both species feed on the foliage of various plants from the family Solanaceae, so either species can be found on tobacco or tomato leaves.  Thus, the plant on which the caterpillar is found does not indicate its species.
Answer: Tobacco