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Man Jing Zi highlights variation within a traditional drug name. The profile records Vitex trifolia and var. simplicifolia; leaves can be simple or trifoliate depending on the taxon, so a single leaf image should not be used as the only identification character. The dried fruit is small, dark, shallowly grooved, and may retain a fuzzy calyx. Compare fruit size and calyx with the source description, then check the voucher and region. Coastal habitats are part of the botanical record, but shore collection can encounter pollution, protected areas, or look-alike Vitex shrubs. The cited formula example gives a historical amount for Man Jing Zi in Qiang Huo Sheng Shi Tang, while the English/Chinese record differs on another ingredient; no modern self-use ratio follows from it. Autumn fruit maturity is not a promise that every garden shrub produces a medicinal-grade lot. Record taxon, leaf form, fruit maturity, collection locality, and drying method. This is a study identity exercise, not a suggestion to collect wild fruit or treat headaches. The leaf variation in Man Jing Zi is a useful reminder to describe the specimen instead of forcing every plant into one picture. Vitex trifolia may have compound leaves, while var. simplicifolia has simple leaves; the fruit and calyx remain important comparison points. A field note should state whether the plant was in flower or fruit, whether leaves were simple or trifoliate, and whether the source identified a variety. The coastal habitat record can guide an ecology lesson but does not justify collecting fruit from beaches, protected dunes, or polluted shorelines. A historical formula amount is tied to its edition and unit system, so retain qian/liang wording and do not convert it into a present-day prescription. These details are more useful for study than memorizing a common name without a species record. The botanical source and the formula source answer different questions. The first can explain fruit shape, leaf variation, coast habitat, and autumn maturity; the second records how a historical author placed the material among other herbs. A formula’s presence does not validate every coastal Vitex or every retail fruit lot. Preserve those two source types separately when making notes or citations.