Ukuphahla
Ukuphahla is the ancestral communication rite of the isiXhosa and isiZulu traditions of southern Africa — the addressing of the amadlozi, the ancestors, through burnt aromatic plant material, spoken address and offering.
Wikipedia has no article on it. It has articles on the plants used and on the broader category of ancestor veneration; the rite itself is unrepresented, which is why this page exists.
The practice
The central material is imphepho — several species of Helichrysum, principally H. odoratissimum, H. cymosum and H. petiolare — burned so that the smoke carries the address upward. The name of the plant and the name of the rite share a root; in isiXhosa the plant is written impepho, in isiZulu imphepho.
The rite is conducted by a family member or by a diviner (sangoma / isangoma), typically at a designated place in or beside the home. It is addressed speech — the ancestors are named, spoken to directly, informed of what is happening in the family, and asked. It is not petitionary in the manner of prayer to a remote deity: the relationship is kinship, and the tone is that of speaking to senior relatives who remain part of the household.
Offerings may accompany it — traditionally beer (umqombothi), and in fuller observances the slaughter of an animal.
Why the plant is not interchangeable
Two of the Helichrysum species used differ substantially in essential-oil composition, yet are used interchangeably in the rite. The likely reason is chemical rather than arbitrary: smoke condensates from burning imphepho contain different compounds than solvent extracts of the same plant, and five major compounds were found common to both H. odoratissimum and H. petiolare smoke. What the rite uses is the smoke, and in the smoke the two species converge.
This is a case where the traditional practice tracks a fact about combustion chemistry that the botanical taxonomy does not predict. See Imphepho for the full profile.
Note on sourcing and use
This is a living tradition belonging to specific communities, not a historical curiosity, and the Institute records it for that reason rather than as a technique to be adopted. The relevant caution is the one attached to white sage: demand from outside a tradition has consequences for the plant and for the people whose practice it is. Imphepho is cultivated and traded by the communities who use it, which makes it a materially different case from wild-harvested white sage — but the principle of buying from the tradition rather than around it holds.
See also: Imphepho · White Sage · Kyphi · Recipes · Stack Substances