Kerelis is the diminutive for keras, which is not a strict term. It just means the entirety of a plant that has a shape which resembles, in miniature, a bush. Or it could indeed refer to one indivdual bushy plant. It could also imply that the individual plant can be multiplied by splitting and transplanting. Or if you planted several seeds and thus produced a bunch from intertwined individual plants, that's a keras also