Question: Does Ixora or Mesquite have more species?

Context paragraphs:
Ixora: Ixora is a genus of flowering plants in the Rubiaceae family.  It is the only genus in the tribe Ixoreae.  It consists of tropical evergreen trees and shrubs and holds around 545 species.  Though native to the tropical and subtropical areas throughout the world, its centre of diversity is in Tropical Asia.  "Ixora" also grows commonly in subtropical climates in the United States, such as Florida where it is commonly known as "West Indian Jasmine".  Other common names include "viruchi", "rangan", "kheme", "ponna", "chann tanea", "techi", "pan", "siantan", "jarum-jarum/jejarum", "jungle flame", "jungle geranium" among others.  The plants possess leathery leaves, ranging from 3 to 6 inches in length, and produce large clusters of tiny flowers in the summer.  Members of Ixora prefer acidic soil, and are suitable choices for bonsai.  It is also a popular choice for hedges in parts of South East Asia.  In tropical climates they flower year round and are commonly used in Hindu worship, as well as in ayurveda and Indian folk medicine.

Ixora umbellata: Ixora umbellata is a species of flowering plant in the Rubiaceae family.  It is found from southern Indo-China to western Malaysia.

Antelope jackrabbit: The antelope jackrabbit ("Lepus alleni"), found in Southern Arizona and Northwestern Mexico, is a species of North American hare.  Within this range, it occupies dry desert areas.  This species is placed in family Leporidae, which is within order Lagomorpha.  Male and female antelope jackrabbits are identical in appearance.  This species is large in size with long, pointed ears and a distinct coat coloration.  The antelope jackrabbit has a white belly, light grey sides, a back peppered with black, and orange coloration on the neck and chest.  It is similar to species like the Black-tailed Jackrabbit and White-sided Jackrabbit.  It is most active during twilight (crepuscular) and nocturnal, but can be active during the day when conditions are favorable (heavy cloud coverage).  It feeds on cacti, mesquite leaves, and other vegetation.

Texas kangaroo rat: The Texas kangaroo rat ("Dipodomys elator") is a rodent of the family Heteromyidae.  It is endemic to Texas where it lives in association with mesquite brush and in areas with firm clay-loam soils.  It is a relatively large kangaroo rat that ranges in size from approximately 60 grams to 95 or more.  Males and females of this species are sexually dimorphic, males being larger than females.  Its distribution is within north-central Texas and it is only found within 13 counties.  It was formerly found in Oklahoma, but is thought to have since been extirpated.  The species is listed as threatened by the Texas Parks and Wildlife Department and the IUCN lists the species as vulnerable.

Ixora pavetta: Ixora pavetta (torch tree) is a plant in the Rubiaceae family.  This species is found in South Asia.  The species is commonly seen in Ballari district of Karnataka, India.  It is called as Goravi (ಗೊರವಿ) in Kannada.  People use the branches of this tree for making walls and paste with mud for their thatched huts in villages, but now this practice has become obsolete owing to modern housing materials.

Ambrosia cheiranthifolia: Ambrosia cheiranthifolia is a rare species of flowering plant known by the common names South Texas ambrosia and Rio Grande ragweed.  It is native to the coast of South Texas and the Mexican states of Tamaulipas and Coahuila.  It occurs in coastal prairie, grassland, and mesquite shrubland habitat.  It has declined because its native habitat has been cleared for development, with remaining open savanna invaded by non-native grasses such as buffelgrass ("Cenchrus ciliaris").  Today there are perhaps 20 populations remaining, but some of these may have very few genetic individuals because the species is clonal, with many cloned plants attached by one rhizome.  It is not certain that the plant still exists in Mexico.  This is a federally listed endangered species of the United States.

Ixora beckleri: Ixora beckleri, commonly known as brown coffeewood, is a species of flowering plant in the Rubiaceae family.  It is endemic to rainforests of eastern Australia, south to Forster in New South Wales.

Mesquite: Mesquite is the common name for the genus "Prosopis", containing over 40 species of small leguminous trees.  They are native to the southwestern United States and Mexico (even the creeping mesquite, which is invasive in southern California).

Rubiaceae: The Rubiaceae are a family of flowering plants, commonly known as the coffee, madder, or bedstraw family.  It consists of terrestrial trees, shrubs, lianas, or herbs that are recognizable by simple, opposite leaves with interpetiolar stipules.  The family contains about 13,500 species in 611 genera, which makes it the fourth-largest angiosperm family.  Rubiaceae has a cosmopolitan distribution; however, the largest species diversity is concentrated in the (sub)tropics.  Economic importance includes "Coffea", the source of coffee, "Cinchona", the source of the antimalarial alkaloid quinine, some dye plants (e.g. "Rubia"), and ornamental cultivars (e.g. "Gardenia", "Ixora", "Pentas").

Ixora coccinea: Ixora coccinea (also known as jungle geranium, flame of the woods or jungle flame) is a species of flowering plant in the Rubiaceae family.  It is a common flowering shrub native to Southern India, Bangladesh and Sri Lanka.  It has become one of the most popular flowering shrubs in South Florida gardens and landscapes.  It is the National flower of Suriname respectively.

Supporting paragraphs: Ixora Mesquite
Answer: Ixora