Question: Townsendia and Exochorda are both?

Context articles: Townsendia leptotes
Four Aces (passenger liners)
Townsendia condensata
SS Exochorda
Townsendia aprica
Exochorda racemosa
Townsendia scapigera
Townsendia
Townsendia rothrockii
Exochorda

Townsendia leptotes is a species of flowering plant in the aster family known by the common names common Townsend daisy and slender townsendia.
 It is native to the western United States, where it grows in the alpine climates of high mountain ranges from California to Montana to New Mexico.
The 4 Aces is the quartet of passenger-cargo liners "Excalibur", "Exochorda", "Exeter", and "Excambion", originally built for American Export Lines by New York Shipbuilding of Camden, New Jersey between 1929 and 1931.
 AEL placed the "4 Aces" in service between the US and the Mediterranean, offering cruises of up to 40 days.
Townsendia condensata is a species of flowering plant in the aster family known by the common names cushion Townsend daisy and cushion townsendia.
 It is native to North America where it is known from many scattered occurrences in the mountains of the western United States and Alberta in Canada.
 It is mainly limited to the alpine climates of high mountain peaks, where it grows in meadows, tundra, and barren, rocky talus.
 It grows alongside other alpine plants such as "Eriogonum androsaceum".
SS "Exochorda", a 473-foot, 14,500-ton cargo liner in service with American Export Lines from 1948 to 1959 .
 A member of the line's post-war quartet of ships, "4 Aces", "Exochorda" sailed regularly from New York on a Mediterranean route.
 Originally built in 1944 as the military attack transport USS Dauphin (APA-97), the ship was extensively refurbished prior to her service as a passenger-cargo liner.
 Following her service as a cruise liner, the vessel served as the floating dormitory ship  for the students of Stevens Institute of Technology, a technological university, in Hoboken, NJ.
 At the end of her service life she was scrapped, in 1979.
Townsendia aprica is a rare species of flowering plant in the aster family known by the common name Last Chance Townsend daisy.
 It is endemic to Utah in the United States, where it is known from three counties.
 It faces a number of threats and it is a federally listed threatened species of the United States.
Exochorda racemosa, pearlbush or common pearlbush, is a species of plant in the rose family.
 This species is mostly found in China and Japan.
Townsendia scapigera is a species of flowering plant in the aster family known by the common name tufted Townsend daisy.
 It is native to the western United States, where it grows in mountains, sagebrush, and other habitat.
Townsendia is a genus of North American plants in the aster tribe within the daisy family.
Townsendia rothrockii is a species of flowering plant in the aster family known by the common name Rothrock's Townsend daisy.
 It is endemic to Colorado in the United States, where there are 35 occurrences across thirteen counties.
 Reports of the plant from New Mexico are false.
Exochorda is a small genus of flowering plants in the family Rosaceae, native to China and central Asia (Turkestan).
 They are used as ornamental plants with the common name pearl bush, or pearlbush.
 Numerous species have been described on the basis of differing appearance and geographical separation, but a systematic study revealed that the different types are closely related and probably all descended from a single species that formerly had a wide distribution that has been fragmented by habitat loss.
 As a single species the correct name is "E. racemosa".