We present a catalog (status July 1, 2022) of triple and higher order systems
identified containing exoplanets based on data from the literature, including
various analyses. We explore statistical properties of the systems with focus
on both the stars and the planets. So far, about 30 triple systems and one to
three quadruple systems, including (mildly) controversial cases, have been
found. The total number of planets is close to 40. All planet-hosting triple
star systems are highly hierarchic, consisting of a quasi-binary complemented
by a distant stellar component, which is in orbit about the common center of
mass. Furthermore, the quadruple systems are in fact pairs of close binaries
(``double-doubles"), with one binary harboring a planet. For the different
types of star-planet systems, we introduce a template for the classifications
of planetary orbital configurations in correspondence to the hierarchy of the
system and the planetary host. The data show that almost all stars are
main-sequence stars, as expected. However, the stellar primaries tend to be
more massive (i.e., corresponding to spectral types A, F, and G) than expected
from single star statistics, a finding also valid for stellar secondaries but
less pronounced. Tertiary stellar components are almost exclusively low-mass
stars of spectral type M. Almost all planets have been discovered based on
either the Radial Velocity or the Transit method. Both gas giants (the dominant
type) and terrestrial planets (including super-Earths) have been identified. We
anticipate the expansion of this data base in the light of future planetary
search missions.Comment: Accepted by ApJS; 59 pages, including 11 figures and 12 table