Rosemary

Rosemary is a Mediterranean evergreen shrub, long known as Rosmarinus officinalis and reclassified in 2017 into Salvia as Salvia rosmarinus on genetic evidence, a change many sources have not caught up with. The old name means dew of the sea, from ros and marinus, and refers to its coastal habit; it has nothing to do with the name Mary, though a folk etymology attaching it to the Virgin is old and widespread.

Rosemary for remembrance is the tag everyone knows, from Ophelia in Hamlet, and the funerary use behind it is real: sprigs of rosemary were thrown into graves in England as a token that the dead would not be forgotten, and the herb was carried at both weddings and funerals. The custom is documented well before Shakespeare used it.

Whether rosemary does anything to memory is a more interesting question than it looks. There is a small experimental literature, including work on rosemary aroma and cognitive performance, reporting modest effects on measures of alertness and recall, and 1,8-cineole from the volatile oil is detectable in blood after aroma exposure and has been correlated with performance in those studies. The effect sizes are small, the samples are small, and the field has replication problems. It would be overstating it to say the folklore is vindicated; it would be inaccurate to say it has been refuted. The correct description is an open, low-powered literature with suggestive results.

Carnosic and rosmarinic acids make rosemary extract an effective antioxidant, and it is used industrially as a food preservative.

Culpeper gives rosemary to the Sun, noting its action on the head and the memory, the Sun in his scheme governing the vital spirits and the higher faculties. That is the sourced attribution.

Rosemary is then an unusually good illustration of how unstable this material becomes once it leaves the source. Later occult compilers variously place it under the Moon, on the dew-of-the-sea name and coastal habit, and under Mercury, on the association with memory and intellect. Each reassignment is internally reasonable and each is unsourced, and printed tables now circulate giving all three without noting that they disagree or where any of them came from.

There is a fourth placement with an actual citation, in a different scheme. Agrippa's fifteen Behenian fixed stars each carry a stone and a plant for talismanic use, and the plant paired with Alphecca, in the Northern Crown, is rosemary. That is a documented Renaissance correspondence, dated and attributable, and it is unrelated to the planetary rulership question.

The lesson generalises past rosemary. When a modern source prints a plant's planetary ruler without attribution, the reasonable default assumption is that it is Culpeper, possibly at several removes, possibly altered along the way, and that any confidence in the figure is borrowed. Where two sources disagree, at least one of them has changed it silently. Rosemary happens to be a case where the drift is easy to trace because the alternatives are each attached to a visible feature of the plant.