Question: Which genus of plant has more species, Melasphaerula or Weigela?

<P0-S0> A weed is a plant considered undesirable in a particular situation, "a plant in the wrong place". <P0-S1>  Examples commonly are plants unwanted in human-controlled settings, such as farm fields, gardens, lawns, and parks. Taxonomically, the term "weed" has no botanical significance, because a plant that is a weed in one context is "not" a weed when growing in a situation where it "is" in fact wanted, and where one species of plant is a valuable crop plant, another species in the same genus might be a serious weed, such as a wild bramble growing among cultivated loganberries. <P0-S2>  Many plants that people widely regard as weeds also are intentionally grown in gardens and other cultivated settings, in which case they are sometimes called beneficial weeds. <P0-S3>  The term "weed" also is applied to any plant that grows or reproduces aggressively, or is invasive outside its native habitat. <P0-S4>  More broadly "weed" occasionally is applied pejoratively to species outside the plant kingdom, species that can survive in diverse environments and reproduce quickly; in this sense it has even been applied to humans. <SEP> <P1-S0> Cladosporium is a genus of fungi including some of the most common indoor and outdoor molds. Species produce olive-green to brown or black colonies, and have dark-pigmented conidia that are formed in simple or branching chains. <P1-S1>  Many species of "Cladosporium" are commonly found on living and dead plant material. <P1-S2>  Some species are plant pathogens, others parasitize other fungi. <P1-S3>  "Cladosporium" spores are wind-dispersed and they are often extremely abundant in outdoor air. <P1-S4>  Indoors "Cladosporium" species may grow on surfaces when moisture is present. " <P1-S5> Cladosporium fulvum", cause of tomato leaf mould, has been an important genetic model, in that the genetics of host resistance are understood. <P1-S6>  In the 1960s, it was estimated that the genus "Cladosporium" contained around 500 plant-pathogenic and saprotrophic species, but this number has since been increased to over 772 species. <P1-S7>  The genus "Cladosporium" is closely related to black yeasts in the order Dothideales. <P1-S8>  "Cladosporium" species are often highly osmotolerant, growing easily on media containing 10% glucose or 12–17% NaCl. <P1-S9>  They are rarely grown on media containing 24% NaCl or 50% glucose and never isolated from medium with 32% NaCl or greater. <P1-S10>  Most species have very fragile spore chains, making it extremely difficult to prepare a mount for microscopic observation in which the conidial chains are preserved intact. <SEP> <P2-S0> Melasphaerula is a genus of flowering plants in the family Iridaceae, first described as a genus in 1803. <P2-S1>  There is only one known species, Melasphaerula graminea, native to Namibia and the Cape Province in South Africa. <SEP> <P3-S0>  All are natives of eastern Asia. <P3-S1>  The genus is named after the German scientist Christian Ehrenfried Weigel. <P3-S2> Weigela is a genus of between six and 38 species of deciduous shrubs in the family Caprifoliaceae, growing to 1–5 m (3-15') tall.