Question: Which genus has more species, Datura or Castanopsis?

Context paragraphs:
Datura leichhardtii: Datura leichhardtii is a species of thorn apple in the genus "Datura".  In 1844, Ludwig Leichhardt is said to have discovered this species in Australia.  Ferdinand von Mueller gave it the name "Datura leichhardtii" when he published his first description of it in 1855.

Datura: Datura is a genus of nine species of poisonous vespertine flowering plants belonging to the family Solanaceae.  They are commonly known as daturas, but also known as devil's trumpets, not to be confused with angel's trumpets, its closely related genus "Brugmansia".  They are also sometimes called moonflowers, jimsonweed, devil's weed, hell's bells, thorn-apple, and many more.  Its precise and natural distribution is uncertain, owing to its extensive cultivation and naturalization throughout the temperate and tropical regions of the globe.  Its distribution within the Americas and North Africa, however, is most likely restricted to the United States and Mexico and Southern Canada in North America, and Tunisia in Africa, where the highest species diversity occurs.

Boletus albobrunnescens: Boletus albobrunnescens is a species of bolete fungus in the family Boletaceae.  It is classified in the section "Boletus" of the genus "Boletus", commonly known as the porcini mushrooms.  First reported to science in 2010, the species was officially described in 2014.  It is found in mixed evergreen and deciduous forests of Thailand, where it fruits singly to scattered in soil under "Pinus" and "Castanopsis" trees.  Its fruit bodies have caps measuring 5.5 – in diameter.  They are white but stain brown to reddish brown, hence the epithet, which combines the Latin words for "white" ("albo") and "becoming brown" ("brunnescens").  The stipe measures 6 – long by 1.5 – thick except for the swollen base, which is up to 5 cm in diameter.  The top of the stipe has a prominent network pattern (reticulations) that diminishes as it extends down to over half its length.  Like the cap, it also stains brown after handling.  The smooth spores are roughly spindle-shaped (fusoid), and measure 10.5–11.9 by 4.2–4.9 μm.

Pyrofomes castanopsidis: Pyrofomes castanopsidis is a species of polypore fungus in the family Polyporaceae.  It was described as new to science in 2011 by Chinese mycologists Bao-Kai Cui and Yu-Cheng Dai.  The type collections of the fungus were made in Luofushan Forest Park in Huizhou (Guangdong Province, China), where the fungus was discovered growing on a live plant of "Castanopsis".  The specific epithet "castanopsidis" refers to the genus of the host plant.

Lettuce necrotic yellows virus: Lettuce necrotic yellows virus (LNYV) is a plant virus belonging to the virus order "Mononegavirales", family "Rhabdoviridae" and genus "Cytorhabdovirus".  It was first identified in Australia in the plant species "Lactuca sativa" in 1963 by Stubbs et al.  Since then it has been identified in many other plant species including "Datura stramonium" and "Nicotiana glutinosa".  The virus is transmitted by the insect vector "Hyperomyzus lactucae" the insect can become infected by feeding on an infected plant.  It then acts as a reservoir for the virus in which it can multiply.  The virus is also transmitted congenitally to its progeny

Iochroma cardenasianum: Iochroma cardenasianum is a spiny shrub bearing very small leaves (0.35-0.5 x 0.1-0.12 cm), a yellow trumpet-shaped campanulate flower, measuring some 3 cm long and globose fruit.  The growth habit is somewhat reminiscent of certain "Lycium" species.  It is endemic to Bolivia, growing in dry, Andean valleys at altitudes of 2,000–2,500 m and 3,000–3,500 m and has been collected near the town of Cotagaita in Potosí Department.  Recent research has revealed that, far from being a species of "Iochroma", "I. cardenasianum" does not even belong in tribe Physaleae (to which "Iochroma" belongs), constituting instead an (as yet unnamed) monotypic genus in tribe Datureae, and thus is most closely related to the genera "Datura" and "Brugmansia", species of which are well known as ornamentals and hallucinogens, owing their activity to tropane alkaloid content.

Castanopsis: Castanopsis, commonly called chinquapin or chinkapin, is a genus of evergreen trees belonging to the beech family, Fagaceae.  The genus contains about 120 species, which are today restricted to tropical and subtropical eastern Asia.  A total of 58 species are native to China, with 30 endemic; the other species occur further south, through Indochina to Indonesia, and also in Japan.  The English name chinkapin is shared with other related plants, including the golden chinkapins of the Pacific United States, which are sometimes included within "Castanopsis" but are more often considered a separate but very closely related genus, "Chrysolepis".

Lactarius acicularis: Lactarius acicularis is a member of the large milk-cap genus "Lactarius" in the order Russulales.  Described as new to science in 2010, the species is found in Chiang Mai Province of northern Thailand, where it grows in rainforests that are dominated by "Castanopsis armata", "Dipterocarpus" sp.  and "Lithocarpus".

Brugmansia: Brugmansia is a genus of seven species of flowering plants in the family Solanaceae.  They are woody trees or shrubs, with pendulous flowers, and have no spines on their fruit.  Their large, fragrant flowers give them their common name of angel's trumpets, a name sometimes used for the closely related genus "Datura".  (Datura differs from Brugmansia in that they are herbaceous bushes, with erect rather than pendulous flowers - and most have spines on their fruit).

Supporting paragraphs: Datura Castanopsis
Answer: Castanopsis