is an obligate stem hemiparasite.

Holoparasites are always obligate so only two terms are needed, e.g.
*Dodder is a stem holoparasite.
*Hydnora spp. are root holoparasites.

Plants usually considered holoparasites include broomrape, dodder, Rafflesia, and the Hydnoraceae. Plants usually considered hemiparasites