Question: What type of category does Pitcairnia and Evolvulus have in common?

full_context: Document 1: Ipomoea obscura: Ipomoea obscura, the obscure morning glory or small white morning glory, is a species of the genus "Ipomoea". It is native to parts of Africa, Asia, and certain Pacific Islands, and it is present in other areas as an introduced species
Document 2: Bromelia laciniosa: Bromelia laciniosa natively known as "macambira", is part of the bromeliad plant family, or in other words, the pineapple family—though not all bromeliads resemble the common pineapple. As a family, the histories of bromeliads have been well recorded, but the details of its many species, like "Bromelia laciniosa", are not known. "Bromelia laciniosa" is native to Brazil and Argentina but cultivated in many other places.
Document 3: Pitcairnia clarkii: Pitcairnia clarkii is a species of plant in the family Bromeliaceae. It is endemic to Ecuador, where it is known only from the type locality in Esmeraldas Province. It grows in coastal forest in a protected area.
Document 4: Ipomoea nil: Ipomoea nil is a species of "Ipomoea" morning glory known by several common names, including picotee morning glory, ivy morning glory, and Japanese morning glory. It is native to most of the tropical world, and has been introduced widely.
Document 5: Evolvulus: Evolvulus is a genus of flowering plants in the Convolvulaceae, the morning glory family. They are known generally as dwarf morning glories. Most all are native to the Americas. There are about 100 species.
Document 6: Ipomoea wrightii: Ipomea wrightii, or Wright's morning glory, is a species of morning glory.It is generally described as an annual, perennial vine or forb or herb. Wright's morning glory is not native to the United States and is considered as an invasive species. It is found growing in the Southeastern part of the United States.
Document 7: Pitcairnioideae: The Pitcairnioideae comprise the terrestrial subfamily of the bromeliads (Bromeliaceae) with over 1000 species in 16 genera. Unlike the many epiphytes and lithophytes which make up the rest of the family, with a few exceptions, all of the members of this subfamily are either terrestrial or saxicolous. Common to arid and high-altitude regions, this subfamily is considered to have the most ancient lineage, more closely resembling its grassy relatives than the exotic novelties represented in the other two subfamilies. The commonly cultivated genera from this group include "Dyckia", "Hechtia", "Pitcairnia", and "Puya".
Document 8: Thonningia: Thonningia is a monotypic genus of flowering plants in the family Balanophoraceae containing the single species Thonningia sanguinea. It is distributed throughout much of southern and western Africa, particularly the tropical regions. Common names for the plant include ground pineapple. A familiar plant to humans, it has an extremely long list of common names in many African languages. Many names are inspired by the resemblance of the plant's inflorescence to a pineapple or palm tree. Some of the names can be translated as pineapple of the bush (from Anyi), duiker's kolanut (from Igala), and crown of the ground (from Yoruba).
Document 9: Datura: Datura is a genus of nine species of poisonous vespertine flowering plants belonging to the family Solanaceae. They are commonly known as daturas, but also known as devil's trumpets, not to be confused with angel's trumpets, its closely related genus "Brugmansia". They are also sometimes called moonflowers, jimsonweed, devil's weed, hell's bells, thorn-apple, and many more. Its precise and natural distribution is uncertain, owing to its extensive cultivation and naturalization throughout the temperate and tropical regions of the globe. Its distribution within the Americas and North Africa, however, is most likely restricted to the United States and Mexico and Southern Canada in North America, and Tunisia in Africa, where the highest species diversity occurs.
Document 10: Pitcairnia: Pitcairnia is a genus of the botanical family Bromeliaceae, subfamily Pitcairnioideae. It was named for Dr. William Pitcairn, English physician and gardener (1711-1791). The genus "Pitcairnia" ranks as the second most prolific of the bromeliad family (after "Tillandsia)." They are most abundant in Colombia, Peru and Brazil, but can also be found in areas from Cuba and Mexico south to Argentina. One species, "Pitcairnia feliciana" is found in tropical West Africa and is the only member of the Bromeliaceae family not native to the Western Hemisphere.
Document 11: Sinningia: Sinningia is a genus of flowering plants in the family Gesneriaceae. It is named after Wilhelm Sinning (1792-1874), a gardener of the Botanische Gärten der Friedrich-Wilhelms-Universität Bonn. There are about 65 species of tuberous herbaceous perennials, all occurring in Central and South America, with the greatest concentration of species occurring in southern Brazil.
Document 12: Brocchinia: Brocchinia is a genus of the botanical family Bromeliaceae, subfamily Pitcairnioideae. However, a recent DNA study suggests the breakup of the Pitcairnioideae subfamily into 6 new subfamilies and "Brocchinia" would be the sole genus of new subfamily Brocchinioideae (family Bromeliaceae). The genus is named for Giovanni Battista Brocchi, Italian naturalist (1772–1826). "Brocchinia" species are native primarily to the ancient Guayana Shield in southern Venezuela and Guyana, with some species extending into Colombia and northern Brazil. Its species are generally restricted to areas of sand and sandstone of the Roraima Formation; a few occur on granite.
Document 13: Eupatorieae: Eupatorieae is a tribe of over 2000 species of plants in the aster family. Most of the species are native to tropical, subtropical, and warm temperate areas of the Americas, but some are found elsewhere. Well-known members are "Stevia rebaudiana" (used as a sugar substitute), a number of medicinal plants ("Eupatorium"), and a variety of late summer to autumn blooming garden flowers, including "Ageratum" (flossflower) and "Conoclinium" (mistflower).
Document 14: Convolvulus cantabrica: Convolvulus cantabrica, common name Cantabrican morning glory or dwarf morning glory, is a herbaceous perennial plant belonging to the genus "Convolvulus" of the Convolvulaceae family.
Document 15: Morning glory: Morning glory (also written as morning-glory) is the common name for over 1,000 species of flowering plants in the family Convolvulaceae, whose current taxonomy and systematics are in flux. Morning glory species belong to many genera, some of which are:
ground_truth: genus