Question: Do the genera Helianthemum and Magnolia share the same family?

Context articles: Magnolia neillii
Phyllocnistis magnoliaeella
Magnolia grandiflora
Magnolia virginiana
Magnolia × wieseneri
Helianthemum
Magnolia Petroleum Company
Magnolia
Terfeziaceae
Helianthemum marifolium

Magnolia neillii is a species of plant in the Magnoliaceae family.
 It is endemic to Ecuador.
 Its natural habitat is subtropical or tropical moist lowland forests.
 If the Magnolia family is treated as consisting of a large number of smaller genera, then this species is placed in genus "Talauma".
 In modern literature, it is customary to treat "Magnolia" as one large genus, and in that case, this species is treated as belonging to section "Talauma" in subgenus "Magnolia".
Phyllocnistis magnoliaeella is a moth of the Gracillariidae family, known from the United States (Florida, Georgia, Louisiana, Virginia, Kentucky, Maryland, New Jersey and New York).
 The hostplants for the species include "Magnolia acuminata", "Magnolia grandiflora", "Magnolia grandiflora", "Magnolia umbrella", and "Magnolia virginiana".
Magnolia grandiflora, commonly known as the southern magnolia or bull bay, is a tree of the family Magnoliaceae native to the southeastern United States, from coastal North Carolina to central Florida, and west to East Texas and Oklahoma.
 Reaching 27.5 m in height, it is a large, striking evergreen tree, with large dark green leaves up to 20 cm long and 12 cm wide, and large, white, fragrant flowers up to 30 cm in diameter.
 Although endemic to the lowland subtropical forests on the Gulf and south Atlantic coastal plain, magnolia grandiflora is widely cultivated in warmer areas around the world.
 The timber is hard and heavy, and has been used commercially to make furniture, pallets, and veneer.
Magnolia virginiana, most commonly known as sweetbay magnolia, or merely sweetbay (also laurel magnolia, swampbay, swamp magnolia, whitebay, or beaver tree), is a member of the magnolia family, Magnoliaceae.
 It was the first magnolia to be scientifically described under modern rules of botanical nomenclature, and is the type species of the genus "Magnolia"; as "Magnolia" is also the type genus of all flowering plants (magnoliophytes), this species in a sense typifies all flowering plants.
Magnolia" × "wieseneri is a hybrid plant in the "Magnolia" genus and family, Magnoliaceae.
 A small tree or large shrub with white highly fragrant blooms, it is the progeny of "Magnolia sieboldii" and "Magnolia obovata".
Helianthemum , known as rock rose, sunrose, rushrose, or frostweed, is a genus of about 110 species of flowering plants in the family Cistaceae.
 They are widely distributed throughout the Northern Hemisphere, especially in the Mediterranean.
 There are New World species, but it has been proposed that these be transferred to genus "Crocanthemum".
The Magnolia Petroleum Company was an early twentieth century petroleum company in Texas founded on April 24, 1911 by the Sealy family of Galveston, as a consolidation of several earlier companies.
 Standard Oil of New York (Socony) exchanged its stock for all of the Magnolia stock (except seven shares for the Directors) in December 1925 though it continued to operate as an affiliate of Socony.
 Socony merged with Vacuum Oil Company in 1931, becoming Socony-Vacuum Oil Company.
 Magnolia Petroleum continued to operate as a subsidiary of Socony-Vacuum.
 In 1959, Magnolia was fully incorporated into the Mobil division of Socony-Vacuum, which later changed its name to Socony Mobil and, ultimately to Mobil Mobil Oil Corporation.
Magnolia is a large genus of about 210 flowering plant species in the subfamily Magnolioideae of the family Magnoliaceae.
 It is named after French botanist Pierre Magnol.
The Terfeziaceae, or desert truffles, is a family of truffles (Arabic: كمأ "Kamā<nowiki>'</nowiki>") endemic to arid and semi-arid areas of the Mediterranean Region, North Africa, and the Middle East, where they live in ectomycorrhizal association with "Helianthemum" species and other ectomycorrhizal plants (including "Cistus", oaks, and pines).
 This group consists of three genera: "Terfezia", "Tirmania", and "Mattirolomyces".
 They are a few centimetres across and weigh from 30 to 300 grams (1-10 oz).
 Desert truffles are often used as a culinary ingredient.
Helianthemum marifolium (syn.
 "Helianthemum alpinum" Delarbre) is an endangered ornamental plant in the Cistaceae family.