The genus of Gidnor includes 5 species growing in the tropical regions of Africa, Arabia and Madagascar. Hydnor is completely devoid of leaves, even rudimentary (residual). Flower buds arise endogenously (i.e., originating from causes lying in the internal environment of the body) and grow in the direction of the soil surface, where they open, rising above the soil no more than the length of the perianth.
Hydornorium flowers are rather large, solitary, almost sessile, bisexual, and without leaves. And what we usually see on the surface of the soil and call it a “flower” is nothing but a very thick, fleshy cup.
The disclosure of hydornoria flowers is very original. The meaty lobes of the calyx often diverge from the beginning in the middle and lower parts, remaining connected at the top of the flower and making it possible for their pollinator beetles to easily penetrate flowers directly from the soil surface. Lobes of the calyx are gummy formations with a rough, brownish surface and a brightly colored inner one.
The inner surface of the flower parts in different species changes color from pure white or pink to bright red. These features of color and structure, as well as the putrid smell of flowers, serve to attract beetles that feed on carrion.
Beetles, climbing into flowers, “travel” in them, especially in their lower part, where the reproductive organs are located, contributing to their pollination. Often, female beetles not only find food in flowers, but also lay eggs there.
Hydornor fruits are rather massive and fleshy, more or less berry-like, but with an almost woody, transversely revealing outer layer.
Seeds are very numerous.
Various animals willingly eat the fruits of hydornor. Thus, baboons, jackals, foxes, porcupines do not mind eating the fruits of gidnory.
Inhabitants of Africa - Bushmen, Somalis, etc. - also willingly use the fruits of Gidnara for food. In Madagascar, hydnorium fruits are considered one of the best local fruits. Thus, the distributors of the seeds of gidnory are the most diverse animals and humans.
In Madagascar, locals use flowers and roots of gidnor to treat heart disease.
But basically, the hydra leads an underground lifestyle, its roots (some of which, strictly speaking, are not roots at all, but underground stems) go deep into the earth, form a network around another plant, stick to other people's roots and, in short, help to guide the hydrator parasitic lifestyle. Plants of the genus Hydnor are parasitic on the roots of a wide variety of plants, such as acacia, euphorbia, cotyledon, leafworm, albicia, adansonia and kigelia. In particular, Hydnora africana prefers various types of milkweed as host plants.