Question: Dahlia and Aruncus are both examples of what type of plant catagorization?

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. <SEP>  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. Aruncus is a genus of clump forming herbaceous perennial plants in the family Rosaceae.  Creamy white plumes of flowers are produced above veined and toothed leaflets. <SEP> The Ayla-Axum amphorae are narrow conical amphoras that were named after the widest range of finds in the Red Sea.  Subsequent findings since the mid- 1990s indicate, however, that the amphoras originate in Byzantine, or even early Islamic, Aqaba.  Hence, the preferred nomenclature is now "Aqaba Amphora."  The Ayla-Axum/Aqaba amphora type has parallels from at least three terrestrial sites in Eritrea and Ethiopia: Aksum, where amphora sherds with gray fabric were found by the Deutsche Aksum Expedition (Zahn 1913: 208); Matara dating to the 4th through 7th centuries (Anfray 1990: 118); and Adulis (Paribeni 1907: 551) examples of which are on display in the National Museum in Asmara.  Other examples have been found at Berenike in Egypt, where the amphoras date firmly to an early 5th century context in what may be the best stratified examples (Hayes 1996: 159-61); from Aqaba in Jordan where many examples have been found, including their kilns; on The Shipwreck at Black Assarca Island, Eritrea (Pedersen 2008; Pedersen 2000); and in the Mediterranean such as on the late 6th-century shipwreck at Iskandil Burnu, Turkey, as well as in Spain and Carthage in strata datable from the mid-fourth to the sixth centuries (Keay 1986: 356, 358, 471).  The largest number (c. 500) came to light during excavations at Zafar/Yemen. <SEP>  A member of the Asteraceae (or Compositae), dicotyledonous plants, related species include the sunflower, daisy, chrysanthemum, and zinnia. Dahlia ( or ) is a genus of bushy, tuberous, herbaceous perennial plants native to Mexico.  There are 42 species of dahlia, with hybrids commonly grown as garden plants.  Flower forms are variable, with one head per stem; these can be as small as 2 in diameter or up to 1 ft ("dinner plate").  This great variety results from dahlias being octoploids—that is, they have eight sets of homologous chromosomes, whereas most plants have only two.  In addition, dahlias also contain many transposons—genetic pieces that move from place to place upon an allele—which contributes to their manifesting such great diversity.