Question: Which genus of plant had more species identified with it in the past, Carissa or Aruncus?

Context paragraphs:
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".

Aruncus: Aruncus is a genus of clump forming herbaceous perennial plants in the family Rosaceae.  Botanical opinion of the number of species differs, with from one to four species accepted.  They are closely related to the genera "Filipendula" and "Spiraea", and are native to mountainous damp woodland in temperate regions of the Northern Hemisphere.  Creamy white plumes of flowers are produced above veined and toothed leaflets.

Synodontis omias: Synodontis omias is a species of upside-down catfish native to the Niger River basin of Guinea, Mali, Niger and Nigeria.  It was first described by German-born British zoologist, ichthyologist, and herpetologist Albert Günther in 1864, from a specimen collected in Jebba, Nigeria, on the Niger River.  There have been very few specimens of this species identified, and it may be the same species as "S. budgetti" from the Upper Niger.

Aruncus dioicus: Aruncus dioicus (Walt.)  (known as goat's beard, buck's-beard or bride's feathers) is a flowering herbaceous perennial plant in the family Rosaceae, and is the type species of the genus "Aruncus".  It has alternate, pinnately compound leaves, on thin, stiff stems, with plumes of feathery white or cream flowers borne in summer.  This plant can be found in moist woodland, often at higher altitudes, throughout temperate areas of Europe, Asia, and eastern and western North America.  In the UK it is considered suitable for planting in and around water areas, and has gained the Royal Horticultural Society's Award of Garden Merit.

Tephritid Workers Database: The Tephritid Workers Database is a web-based database for sharing information on tephritid fruit flies.  Because these species are one of the most economically important group of insect species that threaten fruit and vegetable production and trade worldwide, a tremendous amount of information is made available each year: new technologies developed, new information on their biology and ecology; new control methods made available, new species identified, new outbreaks recorded and new operational control programmes launched.  The TWD allows workers to keep up-to-date on the most recent developments and provides an easily accessible and always available resource.

IUCN Red List extinct in the wild species: Version 2014.2 of the IUCN Red List of Threatened Species identified 78 (39 animal, 39 plant) extinct in the wild species, subspecies and varieties, stocks and subpopulations.

Ornithogalum lebaense: Ornithogalum lebaense is a flowering plant that grows in southwest Angola.  It was discovered on January 2009 by Ernst Jacobus van Jaarsveld.  The word ""lebaense"" refers to Leba Pass, where the plant lives.  "O. lebaense" does not have a known common name, most likely because its habitat is not one that is easily accessible by local people.  There are three other "Ornithogalum" species identified in Angola: "Ornithogalum tenuifolium", "O. pulchrum" and "O. benguellens".

Verrucomicrobia: Verrucomicrobia is a phylum of bacteria.  This phylum contains only a few described species ("Verrucomicrobium spinosum", is an example, the phylum is named after this).  The species identified have been isolated from fresh water and soil environments and human faeces.  A number of as-yet uncultivated species have been identified in association with eukaryotic hosts including extrusive explosive ectosymbionts of protists and endosymbionts of nematodes residing in their gametes.  While verrucae is another name for the warts often found on hands and feet, this phylum is so called not because it is a causative agent thereof, but because of its wart-like morphology.

Lancefield grouping: Lancefield grouping is a method of grouping catalase-negative, coagulase-negative bacteria based on the carbohydrate composition of bacterial antigens found on their cell walls.  The system, created by Rebecca Lancefield, was historically used to organize the various members of the family Streptococcaceae, which includes the genera Lactococcus and Streptococcus, but now is largely superfluous due to explosive growth in the number of streptococcal species identified since the 1970s.  As of 2016, Lancefield designations are often used to communicate medical microbiological results in the United States.  Enterococcus, formerly known as Group D Streptococcus, was believed to be a member of the genus Streptococcus until 1984, after the Lancefield criteria were devised, and so were included in the original Lancefield grouping.  Many - but not all - species of streptococcus are beta-hemolytic.  Notably, Enterococcus and Streptococcus bovis (Lancefield Group D) are not beta-hemolytic.  Though there are many groups of streptococcus, only five are known to commonly cause disease in immune-competent human beings: Group A, Group B, both members of Group D, and two groups that lack the Lancefield carbohydrate antigen: Streptococcus pneumoniae and Viridans streptococci.

Platanthera azorica: Platanthera azorica, commonly known as Hochstetter's butterfly orchid, is a species of orchid in the genus "Platanthera".  It was "rediscovered" in 2013 on a single volcanic ridge on the central Azores island of São Jorge, and "is arguably Europe's rarest "bona fide" orchid species."  While "P. azorica" was previously considered by some sources to be the same as "Platanthera micrantha", the 2013 discovery triggered a thorough analysis of historic and current data and specimens, resulting in three species identified.

Supporting paragraphs: Aruncus Carissa
Answer: Carissa