Clem-Yuz and the Quest for a Cold-Hardy, Sweet Citrus
Clem-Yuz 2-2 from Dr. Brown's original tree in Houston, TX. A very lemon-like Clem-Yuz from Augusta, GA. 'Yuzu Hybrid' from North Carolina An interesting class of citrus hybrids involving the Clementine mandarin was produced by the late Dr. John Brown of Houston, TX, back in the 1960s. Dr. Brown was a physician by profession but was an active and avid breeder of citrus, attempting to produce very cold-hardy, edible citrus. He succeeded in a number of areas, and some of his hybrids are just now getting the recognition they deserve. Many mainstream citrus are already complex hybrids involving two or more species of citrus, and this is true of the Clementine, which is probably a mandarin-orange hybrid (and the orange itself is probably a mandarin-pomelo hybrid). An interesting feature of citrus is that these hybrids produce seeds that are polyembryonic. Each seed will contain two embryos, one produced sexually (zygotic), the other a nucellar clone of the seed parent. O