Question: What type of category does Plantago and Matteuccia have in common?

Context articles: Fitkid
Plantago rugelii
Plantago
Matteuccia
Plantaginaceae
Plantago cordata
Plantago princeps
Plantago lanceolata
Plantago hawaiensis
Arnoglossum

Fitkid (also "FitKid", "Fit Kid" or "Fit-Kid") is a type of children's sport combining gymnastics, dance and acrobatics.
 It originated in Europe in the 1990s, and is meant to engage children 8–18 years of age in fun individual and group exercise, free of the extremes of more strenuous aerobics or traditional gymnastics.
 International competitions are organized regularly by the "International FitKid Division", in addition to national competitions.
 A routine stands of four types of elements: strength, flexibility, acrobatics, and jumps.
 All elements are graded by difficulty from A to H.
 A elements being worth 0.1 points, B 0.2, C 0.3, and so on until H which is worth 0.8.
 Routines get evaluated in three categories: technique, artistry, and content (execution of elements).
 Competition is divided by age groups (I. to IX.
 (or Senior in A category)), and categories ( which are based on knowledge).
 There three categories (from hardest to easiest) A, B, and C, also called Dance.
 In each categories there are group and individual routines.
 In C Category (here group routines are also called Dance Show) team member can go from 4 to 8.
 In A and B category there are duos, small groups (3-4), and big groups (5-6).
 In C category, individually 4 elements have to be performed ( one from each type), A or B difficulty, and in groups, two are optional.
 In B category individually 8 elements need to be performed ( two from each type) A-D difficulty ( but max.
 two elements can be D), and in groups 4 (same as C category individual).
 In A category team and individual, 8 elements need to be performed (same as B category) and an acrobatic connection is optional.
 Skills in A category can be any difficulty.
Plantago rugelii is a species of flowering plant in the plantain family, Plantaginaceae.
 It is native to North America, where it occurs in eastern Canada and the central and eastern United States.
 Its common names include American plantain, blackseed plantain, pale plantain, and Rugel's plantain.
 The generic name "Plantago" is from the Latin "planta" ("footprint") and the species name "rugelii" honors Ferdinand Ignatius Xavier Rugel (1806-1879), a German-born botanist and pharmacist.
Plantago is a genus of about 200 species of small, inconspicuous plants commonly called plantains or fleaworts.
 The common name plantain is shared with the unrelated cooking plantain, a kind of banana.
 Most are herbaceous plants, though a few are subshrubs growing to 60 cm tall.
Matteuccia is a genus of ferns with one species, Matteuccia struthiopteris (common names ostrich fern, fiddlehead fern or shuttlecock fern).
 It is a crown-forming, colony-forming plant, occurring in temperate regions of the Northern Hemisphere in central and northern Europe, northern Asia, and northern North America.
 The species epithet "struthiopteris" comes from Ancient Greek words, "struthio" meaning ostrich and "pterion" meaning wing.
Plantaginaceae, the plantain family, is a family of flowering plants in the order Lamiales.
 The type genus is "Plantago" L..
Plantago cordata is a species of flowering plant in the plantain family known by the common name heartleaf plantain.
 It is native to eastern North America, where it is distributed throughout eastern Canada and the eastern United States.
 Though it has a wide distribution, it is very localized, and populations have declined almost everywhere.
Plantago princeps is a rare species of flowering plant in the plantain family known by the common name ale.
 It is endemic to Hawaii, where it is known from the islands of Hawaii, Kauai, Oahu, Molokai, and Maui.
 Like other Hawaiian "Plantago", it is known as kuahiwi laukahi, or laukahi kuahiwi.
 It is a federally listed endangered species of the United States.
Plantago lanceolata is a species of flowering plant in the plantain family Plantaginaceae.
 It is known by the common names English plantain, narrowleaf plantain, ribwort plantain, ribleaf and lamb's tongue.
 It is a common weed of cultivated land.
Plantago hawaiensis is a rare species of flowering plant in the plantain family known by the common name Hawaiian plantain.
 It is endemic to Hawaii, where it is known only from the island of Hawaii.
 It grows on the slopes of Mauna Loa and Hualalai.
 Like other Hawaiian "Plantago", it is known as kuahiwi laukahi.
 It is a federally listed endangered species of the United States.
Arnoglossum is a North American genus of plants in the sunflower family, described as a genus in 1817.
 Common name Indian plantain despite not being closely related to the common plantain (Plantago spp.)
 nor to the cooking plantain (Musa × paradisiaca)