Hymenosporum flavum, or native frangipani, is a rainforest tree which is native to Queensland and New South Wales in Australia and New Guinea.
 It is the sole species within the genus Hymenosporum, and is closely related to the widespread genus Pittosporum.
Pittosporum ( or ) is a genus of about 200 species of flowering plants in the family Pittosporaceae.
 The genus is probably Gondwanan in origin; its present range extends from Australasia, Oceania, eastern Asia and some parts of Africa.
 "Citriobatus" is usually included here, but might be a distinct (though closely related) genus.
 They are commonly known as pittosporums or, more ambiguously, "cheesewoods".
Pittosporum angustifolium (formerly Pittosporum phillyreoides) is a shrub or small tree growing in inland Australia.
 A slow growing plant, usually seen between two and six metres high, though exceptional specimens may exceed ten metres.
 Common names include Weeping Pittosporum, Butterbush, Cattle Bush, Native Apricot, Gumbi Gumbi, Cumby Cumby, Meemeei and Berrigan.
 It is drought and frost resistant.
 It can survive in areas with rainfall as low as 150 mm per year.
 A resilient desert species, individuals may live for over a hundred years.
 A revision of the genus "Pittosporum" re-instated this species the year 2000.
Pittosporum patulum is plant species endemic to New Zealand where it has a restricted distribution on South Island only ranging from Nelson, New Zealand in the north with occurrences in inland Marlborough down to Wanaka in the south.
 It is unusual amongst the genus in having deep red and scented flowers.
Paralucia is a genus of butterflies belonging to the family Lycaenidae.
 The caterpillars feed on "Bursaria" and sometimes "Pittosporum" species and co-habit with ants of the genera "Anonychomyrma" and "Notoncus".
Astilbe is a genus of 18 species of rhizomatous flowering plants within the family Saxifragaceae, native to mountain ravines and woodlands in Asia and North America.
 Some species are known by the common names false goat's beard and false spirea.
Myrsine is a genus of flowering plants in the family Primulaceae.
 It was formerly placed in the family Myrsinaceae before this was merged into the Primulaceae.
 It is found nearly worldwide, primarily in tropical and subtropical areas.
 It contains about 200 species, including several notable radiations, such as the matipo of New Zealand and the kōlea of Hawaiʻ i (the New Zealand "black matipo", "Pittosporum tenuifolium", is not related to "Myrsine").
 In the United States, members of this genus are known as colicwood.
 Some species, especially "M. africana", are grown as ornamental shrubs.

Question: Which genus has more species, Astilbe or Pittosporum ?
Answer: Pittosporum