Heterotropa

…An evergreen perennial plant of the Aristolochiaceae family cultivated for ornamental purposes. One or two leaves emerge from the tip of a shortened, branched stem, which grows in clusters. The leaves are somewhat fleshy, spurge-ovate, 6-10 cm long, and come in a variety of colors, from dark green to those with various patterns. The petioles are purple, but some are green and have lost their pigment. Flowers with short stalks grow between the leaves. The perianth has three leaves, which are fused at the base to form a perfect cylinder, and the upper part opens out into three lobes. The inner wall of the tubular part usually has nine vertically protruding wrinkles, which connect them in a stepped pattern. …

*Some of the terminology explanations that mention "Heterotropa" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…観賞用に栽植されるウマノスズクサ科の常緑多年草。短縮し分枝した茎の先端から1～2枚の葉を出し，株をつくり群がる。葉はやや肉厚，ほこ形卵形で長さ6～10cm，全体が濃緑色のものや，いろいろな形の斑紋の発達したものがあり，多彩である。葉柄は紫色を帯びるが，色素をなくした緑色のものもある。葉間から，短い花梗をつけた花をつける。花被は3枚で，基部は合着し，完全な円筒をつくり，上部は3裂し開出する。筒状部の内壁には通常9本の縦に通る突出したしわと，それを階段状につなぐしわを有する。…

※「Heterotropa」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報