Hostile-dependent relationships are characterized by either one sided, or a mutual atmosphere of hostility and aggression between the partners, which are endured due to the dependence of the partners involved (Aldrich, 1966).
 Since the members of the relationship are dependent on one another, these characteristics can express themselves in complementary ways.
 For example, between spouses where one is a sadist and the other a masochist, however many other forms are possible, for example, as abusive spousal relationships or in parental relationships with their dependent children (both young, teen and adult children) and in other circumstances of dependency.
 Many members of hostile-dependent relationships remain together, despite the conflict between one another.
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.
A flow tracer is any fluid property used to track flow.
 The concentration of a chemical compound in the fluid can be used as a chemical tracer, and characteristics such as temperature are physical tracers.
 Tracers may be artificially introduced, like dye tracers, or they may be naturally occurring; radioactive tracers may be either.
 Conservative tracers remain constant following fluid parcels, whereas reactive tracers (such as compounds undergoing a mutual chemical reaction) grow or decay with time.
Acalypha is a genus of flowering plants in the family Euphorbiaceae.
 It is the sole genus of the subtribe Acalyphinae.
 It is one of the largest euphorb genera, with approximately 450 to 462 species.
 The genus name "Acalypha" is from the Greek ακαλεφης, "akalephes" ("nettle"), and was inspired by the nettle-like leaves.
 General common names include copperleaf.

Question: Evolvulus and Acalypha, have which mutual characteristics?
Answer: flowering plant