Question: Which genus includes more species, Nicandra or Carissa?

Context paragraphs:
Lymphocryptovirus: Lymphocryptovirus is a genus of viruses in the order Herpesvirales, in the family Herpesviridae, in the subfamily Gammaherpesvirinae.  This genus includes the human-infecting Epstein–Barr virus, as well as viruses that infect both Old World monkeys and New World monkeys.  Other names for the Lymphocryptovirus genus include "Lymphocryptoviridae" and gamma-1 herpesviruses.  There are currently eight species in this genus including the type species Human herpesvirus 4.  Diseases associated with this genus include: mononucleosis, Burkitt's lymphoma, and nasopharyngeal carcinoma.

Thraupis: Thraupis is a genus of birds of the tanager family occurring from Mexico to Argentina.  Some are familiar species with large ranges.  As currently defined the genus includes 9 species, but this includes species from two separate clades. Consequently, the genus is paraphyletic and two species ("T. cyanocephala" and "T. bonariensis") are likely to eventually be moved to another genus.

Nicandra: Nicandra is a monotypic genus of flowering plants in the nightshade family containing the single species Nicandra physalodes.  It is known by the common names apple-of-Peru and shoo-fly plant.  It is thought originally to have been native to Peru (known elsewhere as an introduced species and sometimes as a weed) and is found nowadays as a ruderal species in tropical, subtropical and, to a lesser extent, temperate areas all over the world.  It has also long been cultivated as an ornamental plant for its attractive flowers and curious fruits (the latter sometimes dried for use in floral design) and has been adopted into the traditional medicine of countries far-removed from its original home.

Labidochromis: Labidochromis is a genus of cichlid fishes that are endemic to Lake Malawi in East Africa.  The genus includes 18 formally described species, and several yet undescribed species.  It includes a number of species commonly kept in cichlid aquariums such as "L. caeruleus" (electric yellow).  The species in this genus can easily hybridize, so if kept in an aquarium it is recommended to only have one species from this genus.

Protoparvovirus: Protoparvovirus is a genus of viruses in the subfamily "Parvovirinae" of the virus family "Parvoviridae".  Vertebrates serve as natural hosts.  There are currently five species in this genus including the type species "Rodent protoparvovirus 1".  This genus includes canine parvovirus, which causes gastrointestinal tract damage in puppies that is about 80% fatal.  Until 2014, the genus was called "Parvovirus", but it was renamed to eliminate confusion between members of this genus and members of the entire family "Parvoviridae".

Secale: "Secale" is a genus of the Triticeae tribe containing grasses that are related to barley ("Hordeum") and wheat ("Triticum").  The genus includes cultivated species such as rye ("Secale cereale") as well as weedy and wild rye species.  The most well known species of the genus is the cultivated rye, "S. cereale", which is grown as a grain and forage crop.  Wild and weedy rye species help provide a huge gene pool that can be used for improvement of the cultivated rye.

Gaura: Gaura is a genus of flowering plants in the family Onagraceae, native to North America.  The genus includes many species known commonly as beeblossoms.  Recent genetic research has shown that the genus is paraphyletic unless the monotypic genus "Stenosiphon" is included within "Gaura", increasing the number of species in the genus to 22.

Jewel scarab: The Ruteline genus Chrysina, or jewel scarabs (not to be confused with jewel beetles which are a different family), is a large genus of brightly colored, often metallic iridescent species, ranging from the southwestern edge of the United States as far south as Ecuador.  The genus includes all the species formerly known as "Plusiotis".  They are typically between 15-35mm in length, and are nocturnal in habits, coming readily to lights.  The larvae live in rotting logs, while the adults commonly feed on foliage; they tend to be found in pine, juniper, or pine-oak forests, most commonly between 1000-3000m elevation.  They are most diverse in countries such as Honduras, where as many as 15 species can be found in a single location.  There are only 4 species which occur in the United States (see taxobox).

Carissa: Carissa is a genus of shrubs or small trees native to tropical and subtropical regions of Africa, Australia and Asia.  Until recently about 100 species were listed, but most of them have been relegated to the status of synonyms or assigned to other genera, such as "Acokanthera".

Pleurozia: Pleurozia is the only genus of liverworts in the family Pleuroziaceae, which is now classified in its own order Pleuroziales, but was previously included in a broader circumscription of the Jungermanniales.  The genus includes eleven species, and as a whole is both physically distinctive and widely distributed.  The lower leaf lobes of "Pleurozia" species are fused, forming a closed water sac covered by a movable lid similar in structure to those of the angiosperm genus "Utricularia".  These sacs were assumed to play a role in water storage, but a 2005 study on "Pleurozia purpurea" found that the sacs attract and trap ciliates, much in the same way as "Utricularia".  Observations of plants "in situ" also revealed a large number of trapped prey within the sacs, suggesting that the species in this genus obtain some benefit from a carnivorous habit.  After "Colura", this was the second report of zoophagy among the liverworts.

Supporting paragraphs: Nicandra Carissa
Answer: Carissa