This unusual form of P. vivax develops "Bory-like" coloration near the base of the culm. It is not as consistent as Bory, but interesting, none the less, because of the large diameter culms inherent to all forms of vivax. This is one of the plants we grew from the seed we collected from the vivax at our old nursery in Milwaukie Oregon. It was the first new bamboo variety originated at Bamboo Garden. P. nigra 'Bory' and P. glauca 'Yunzhu' have similar variations, but each type looks unique in its own way.