No text, but a visual code

[-JKP-]

Given that outside the circle of Ecliptic there are stars and no herbs, it is logical to think that flowers replace stars in constellations inside the Zodiac. 
I think it's a way of saying that not all stars have power over herbs. There is a relationship between the Zodiac and the plants, specifically medicinal herbs, and here there is an example

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We do know that they believed there is a relationship between zodiac constellations (and the planets) and plants. That was taken for granted at the time.