Poncirus trifoliata is the only species in the genus and can be found growing wild in northern China and Korea, where it thrives on sheltered, sunny hillsides and valleys. Its common name ...

Flying Dragon (Poncirus trifoliata): A unique and exotic citrus relative, Flying Dragon is a deciduous, very dwarf tree with attractive, contorted branches and equally attractive, hook-shaped thorns.

Well, “dragon” was a great clue but the photo was a dead giveaway. You were looking at a plant known as Poncirus trifoliata “Flying Dragon” (pon-SIGH-rus tri-fo-lee-AH-ta).

The trifoliata rootstock also imparts increased cold hardiness to the upper part of the tree. But the rootstock is never intended to sprout and grow shoots.

However, I do believe that there is a hardy citrus tree (or relative) growing on Monte Sano – appropriately named the Hardy orange (Poncirus trifoliata pon-SIGH-rus try-foh-lee-A-tuh) or Bitter ...

Citrus tristeza virus (CTV) is the major virus pathogen causing significant economic damage to citrus worldwide, and a single dominant gene, Ctv, provides broad spectrum resistance to CTV in Poncirus ...

The degree of polyembryony in progenies of 88 citrus hybrids derived from crosses between monoembryonic 'Clementine' (C. reticulata Blanco) as seed parent, and Poncirus trifoliata Raf., sour orange (C ...