noun
climbing stem
Botanical term for a stem that climbs by twining, tendrils, or other means. Rare in everyday language.
アサガオの攀縁茎は支柱に巻き付いて伸びる。
The climbing stem of the morning glory twines around the support as it grows.
つる性 is a broader term for a climbing or vining habit, while 攀縁茎 specifically refers to the stem itself.
Compound of 攀縁 (climbing) + 茎 (stem). The exact historical derivation is uncertain; the spelling is conventionally associated with botanical terminology.