I at least partially understand all the invocations in Litaniae in omni tribulatione, but one stays mysterious: "Angelórum planta ágmini" It's quite Google-proof, a quoted search for it returned only references to the litanies. The oldest surviving record of the litanies is from circa 1400 AD, but they are older, perhaps even composed in the first generations of Dominican friars in 13th century.
Analyzing the text, I understand the first word for certain (plural genitive of "angelus"). The second word could be either singular vocative of noun "planta" or singular imperative of verb "planto, plantare" (the verb seems to fit the context better, but I'm not sure), and I have no idea with the third word.