Grex is latin for flock. It is a term used by hybridizers when talking about the seedlings resulting from a specific cross. As in a flock of sheep or a swarm of bees, they all look about the same from a distance. Up close and on careful examination, each is clearly an individual.
Below are a dozen different stems of seedlings from bulbs that resulted from a careful selfing of “Edgedin Gold’. The strategy of selfing is sometimes used as it often intensifies expressed traits. The goal here was to whiten the perianth and darken the gold picotee. Note the variance in each stem below. Note the differences in shape, petal width, flatness, etc. Again, they all look about the same but each flower stem is different. The grouping below could be called a grex.
There is another oddity to see in the below grex. The taller flower stems in the middle and on the right have more flowers, thicker stems, are taller, and have heavier substance. I wonder if these might be of higher ploidy? The height, flower size and number, and vigor of these two were quite noticeable in the field row in comparison to its siblings.
Steve