Question: Which genus has been around longer, Encelia or Dregea?

Context paragraphs:
Encelia: Encelia is a genus of the plant family Asteraceae.  It consists of shrubs (and one geophyte) of arid environments in southwestern North America and western South America.

Oeceoclades quadriloba: Oeceoclades quadriloba is a terrestrial orchid species in the genus "Oeceoclades" that is native to Swaziland, southern Zimbabwe, and western Madagascar.  It was first described by the German botanist Rudolf Schlechter in 1913 as "Eulophia quadriloba".  Schlechter later moved this species to the genus "Eulophidium" in 1925.  It was again moved to the genus "Lissochilus" by the French botanist Joseph Marie Henry Alfred Perrier de la Bâthie in 1941 and last transferred the genus "Oeceoclades" in 1976 by Leslie Andrew Garay and Peter Taylor.  Garay and Taylor noted that structure of the labellum is unique in the genus and resembles that of an Asian genus of orchids, "Grosourdya".  The spur is longer than the midlobe of the labellum.

Felis attica: Felis attica is an extinct felid of the subfamily Felinae.  Around 12 million years ago, the genus "Felis" appeared and eventually gave rise to many of the modern small cats.  "Felis attica" was a small lynx-like cat, and was one of the ancestors of the first modern "Felis" species, such as "F. lunensis" (Martelli's cat), which appeared around 2.5 million years ago during the Pliocene epoch.  Fossil specimens of "F. attica" have been recovered in western Eurasia.  Fossil evidence suggests that "F. attica" was among the smallest of the Miocene Felinae: about the size of the modern bobcat ("Lynx rufus"), but with a longer profile.  It was made the type species of a separate genus, Pristifelis, by Salesa "et al." (2012).

Urocitellus: Urocitellus is a genus of ground squirrels.  They were previously believed to belong to the much larger genus "Spermophilus", but DNA sequencing of the cytochrome "b" gene showed that this group was paraphyletic to the prairie dogs and marmots, and could therefore no longer be retained as a single genus.  As a result, "Urocitellus" is now considered as a genus in its own right.

Celsinotum candango: Celsinotum candango is a species of crustaceans.  Its epithet comes from the name applied to people that built the city of Brasilia and was subsequently used for its inhabitants.  The species was found in Lagoa do Henrique, a freshwater pond in the Brasília National Park.  Its body is high and rounded, with a low dorsal keel.  Its last 5–8 ventral setae ventral setae thick and spiniform, carrying 1–3 setules on their posterior margin.  Its head shield and head pores are the same as its cogenerate species, as is its labrum, antenna and antennule and thoracic limbs.  "Celsinotum candango" other species of the genus in the proportions of its postabdomen, given the postanal portion is 1.2–1.3 times longer than the anal one in all other species.  It differs from Australian species ("C. hypsophilum, "C. parooensis" and C. platamoides") by its less developed keel, the lateral head pores which are located close to midline, a longer spine on the basal segment of the antenna exopodite, and by the presence of very big projections on the latter.  The Brazilian "C. Laticaudatum" differs from "C. candango" by having a longer spine on the basal segment of the antenna exopodite, in the shape of its postabdomen, and in postabdominal denticles, which in this species are long and single.

Dregea: Dregea is a genus of vines in the Apocynaceae, first described as a genus with this name in 1838.  It is native to Africa and southern Asia.

Draparnaldia: Draparnaldia is a genus of freshwater green algae, in the family Chaetophoraceae.  Draparnaldia are uniseriate; each filament is composed of a chain of cells arranged in one row.  Chloroplasts appear as a band within the center of each cell.  The length of the main axis cells are generally the same, regardless of whether or not they bear branches.  These side branches are divided extensively into terminal hairs.  The entire plant is enveloped in loose, slippery mucilage.  "Draparnaldia" is a cosmopolitan genus with wide distribution and it is usually found in cold aerated waters.They are either attached to sand or grow epiphytically on other aquatic plants.  "Draparnaldia" can be seen growing in clear streams trailing on stones and boulders .  Herman S. Forest of The Southern Appalachian Botanical Club has stated that while not common, it is present frequently enough to be recorded in almost all local flora lists of green algae that have been compiled.  A multitude of species are present in Lake Baikal, Siberia and have been described by Meyer and Jasnitzky.  It is interesting to note that a species of the genus had been placed and described in the Linnean Herbarium as Conferva Mutabilis Roth in 1797.  Nowadays Conferva is no longer used and the species is described as Draparnaldia mutabilis (Roth) Bory.  Bory is added in honour of the researcher of the same name, based on whose description the genus was separated from similar appearing forms.  Bory is accredited with the establishment of the genus.

Enceliopsis: Enceliopsis is a small genus of flowering plants in the daisy family.  They are sometimes called sunrays.  They are similar to the daisylike plants in the related genus "Encelia".  These three shrubs are native to the western United States and Canada.

Dermogenys: Dermogenys is a genus of viviparous halfbeaks.  They are widely distributed in fresh and brackish water in South and Southeast Asia, ranging from India to the Philippines and Greater Sundas.  They are all viviparous, producing small clutches of up to 30 fry that closely resemble the adults, except they are much smaller, around 1 - in length.  Adults are typically around 6 - in length, with females being slightly larger than males.  Males tend to be more brightly coloured and are well known for being aggressive towards one another.  The wrestling halfbeak, "D. pusilla", is widely used in Asia as fighting animals upon which wagers are placed (see Siamese fighting fish).  Both sexes have lower jaws (mandibles) that are much longer than the upper ones, and from this comes the "halfbeak" name.

Stylidium diceratum: Stylidium diceratum is a dicotyledonous plant that belongs to the genus "Stylidium" (family Stylidiaceae).  The specific epithet "diceratum" is Greek for "two horns", referring to the two appendages that are present on the bend of the gynostemium.  It is an annual plant that grows from 15 to 35 cm tall.  The longer leaves are lanceolate and the shorter ones are spathulate, forming a basal rosettes around the stem.  The leaves are around 5–8 mm long and 0.2-2.5 mm wide.  Inflorescences are around 6–15 cm long and produce flowers that are orange with dark orange and pink veins and bloom from June to August in their native range.  "S. diceratum" is only known from the type location, which is at creek crossings on the road to Beverley Springs in the Kimberley region of Western Australia.  Its habitat is recorded as being sandy soils on creek margins.  It grows in the presence of "S. ceratophorum", "S. rubriscapum", "Drosera caduca", "D. paradoxa", "Byblis liniflora", and "Grevillea pteridifolia".  "S. diceratum" is most closely related to "S. longicornu", but it can be confused with "S. ceratophorum", which also has an orange corolla but twice as large.

Supporting paragraphs: Encelia Dregea
Answer: Dregea