Question: In between Indigofera and Willow, which one has 750 species?

full_context: Document 1: Indigofera australis: Indigofera australis, known as Australian Indigo, is an attractive species of leguminous shrub in the genus "Indigofera" (Fabaceae family). The genus name ""Indigofera"" is Neo-Latin for "bearing Indigo" (Indigo is a purple dye originally obtained from some "Indigofera" species), while "australis" from the Latin, means "southern", referring to the geographical distribution of the species.
Document 2: Salix acutifolia: Salix acutifolia, also known as Siberian violet-willow, long-leaved violet willow or sharp-leaf willow, is a species of flowering plant in the Salicaceae family, native to Russia and eastern Asia. It is a spreading, deciduous shrub or tree, growing to 10 m tall by 12 m wide. The young shoots are deep purple with a white bloom. The leaves are narrow, up to 10 cm long. The catkins are produced in early spring, before the leaves. Older bark has a fine, netted pattern.
Document 3: Salix caroliniana: Salix caroliniana, commonly known as the coastal plain willow, is a shrub or small tree native to the southeastern United States, Mexico and parts of Central America and the Caribbean. It is an obligate wetland species and grows as an emergent species in the Everglades. In the absence of fire, "S. caroliniana" can convert herbaceous wetlands to forested wetlands. Although fires kill large woody stems and the species does not reproduce by rhizomes or root sprouts, it sprouts readily after fire. As a result, the total number of stems does not change, but fire converts "S. caroliniana" from a tree into a shrub.
Document 4: Salix humboldtiana: Salix humboldtiana, the Humboldt's willow, is a tree species of willow native to North and South America, growing along watercourses.
Document 5: Salix atrocinerea: Salix atrocinerea, commonly called grey willow or large gray willow, is a species of willow. It is a bush or small tree up to 12 m tall. As a pioneer species of willow, it quickly colonizes poor soils.
Document 6: Clover: Clover or trefoil are common names for plants of the genus Trifolium (Latin, "tres" "three" + "folium" "leaf"), consisting of about 300 species of plants in the leguminous pea family Fabaceae. The genus has a cosmopolitan distribution; the highest diversity is found in the temperate Northern Hemisphere, but many species also occur in South America and Africa, including at high altitudes on mountains in the tropics. They are small annual, biennial, or short-lived perennial herbaceous plants. Clover can be evergreen. The leaves are trifoliate (rarely quatrefoiled (Four-leaf clover), cinquefoil, or septfoil), with stipules adnate to the leaf-stalk, and heads or dense spikes of small red, purple, white, or yellow flowers; the small, few-seeded pods are enclosed in the calyx. Other closely related genera often called clovers include "Melilotus" (sweet clover) and "Medicago" (alfalfa or Calvary clover).
Document 7: Bauhinia: Bauhinia is a genus of more than 500 species of flowering plants in the subfamily Cercidoideae of the large flowering plant family Fabaceae, with a pantropical distribution. The genus was named after the Bauhin brothers, Swiss-French botanists.
Document 8: Indigofera tinctoria: Indigofera tinctoria, also called true indigo, is a species of plant from the bean family that was one of the original sources of indigo dye. It has been naturalized to tropical and temperate Asia, as well as parts of Africa, but its native habitat is unknown since it has been in cultivation worldwide for many centuries. Today most dye is synthetic, but natural dye from "I. tinctoria" is still available, marketed as natural coloring where it is known as tarum in Indonesia and nila in Malaysia. In Iran and areas of the former Soviet Union it is known as basma. The plant is also widely grown as a soil-improving groundcover.
Document 9: Baptisia: Baptisia (wild indigo, false indigo) is a genus in the legume family, Fabaceae. They are flowering herbaceous perennial plants with pea-like flowers, followed by pods, which are sometimes inflated. They are native to woodland and grassland in eastern and southern North America. The species most commonly found in cultivation is "B. australis".
Document 10: Fabaceae: The Fabaceae or Papilionoideae, commonly known as the legume, pea, or bean family, is a large and economically important family of flowering plants. It includes trees, shrubs, and perennial or annual herbaceous plants, which are easily recognized by their fruit (legume) and their compound, stipulated leaves. Many legumes have characteristics of flowers and fruits. The family is widely distributed, and is the third-largest land plant family in terms of number of species, behind only the Orchidaceae and Asteraceae, with about 751 genera and some 19,000 known species. The five largest of the genera are "Astragalus" (over 3,000 species), "Acacia" (over 1000 species), "Indigofera" (around 700 species), "Crotalaria" (around 700 species) and "Mimosa" (around 500 species), which constitute about a quarter of all legume species. The ca. 19,000 known legume species amount to about 7% of flowering plant species. Fabaceae is the most common family found in tropical rainforests and in dry forests in the Americas and Africa.
Document 11: Inocybe salicis: Inocybe salicis is an uncommon species of fungus found in association with willow in Europe. The species produces small, brown or yellow mushrooms with caps up to 2.5 cm across, with stems up to 3.5 cm long. The species is similar in appearance to several other closely related species in the genus "Inocybe" that also associate with willow, and so is most reliably differentiated microscopically.
Document 12: Salix warburgii: Salix warburgii is a plant of the genus "Salix", the willows, endemic to Taiwan. It can be found among shrubs near water. growing 15 m tall. Liliaceae is the most fortunate plant in the vascular plant. It can live the most northern where is in the polar environment. In the tropical edge of the formation of endemic species in Taiwan is the reason for the rapid evolution of species in a special environment. The evolution of the results of the time and space, In addition to water willow outside the southeastern China's other multi-stamens willow and the four sub-Liu will have a similar situation, and these special willow plants are also known as tropical willow. Salix warburgii in Taiwan's distribution is low Elevation of the shrub and the river bank, because the cutting method is easy to survive so there is no artificial introduction of cultivation.
Document 13: Willow: Willows, also called sallows, and osiers, form the genus Salix, around 400 species of deciduous trees and shrubs, found primarily on moist soils in cold and temperate regions of the Northern Hemisphere. Most species are known as willow, but some narrow-leaved shrub species are called osier, and some broader-leaved species are referred to as sallow (from Old English "sealh", related to the Latin word "salix", willow). Some willows (particularly arctic and alpine species) are low-growing or creeping shrubs; for example, the dwarf willow ("Salix herbacea") rarely exceeds 6 cm in height, though it spreads widely across the ground.
Document 14: Salix myrsinifolia: Salix myrsinifolia, known as the dark-leaved willow or myrsine-leaved willow, is a species of willow native to Europe and Western Siberia. It forms a 2 - high shrub. In the north it becomes often a tree up to 8 m tall.
Document 15: Indigofera: Indigofera is a large genus of over 750 species of flowering plants belonging to the family Fabaceae. They are widely distributed throughout the tropical and subtropical regions of the world.
ground_truth: Indigofera