Katie was close. Toby could sense her. He ignored the branches whipping his face and the brambles tripping him. Instead, he just ran, the screams of demons in his ears.
It is a matter of familiar observation that the ends of the shoots of brambles take root when bent down to the ground.
Katie started in the direction of the woman's voice. She stumbled over fallen, slick wood and brambles she couldn't see. Whatever magic that had cleared a path for her was gone. She struggled through the jungle before calling out, "Can you hear me? I can't see much. You'll have to say something, so I can find you."
The occurrence of hybrids in nature explains the difficulty experienced by botanists in deciding on what is a species, and the widely different limitations of the term adopted by different observers in the case of willows, roses, brambles, &c. The artificial process is practically the same in hybridization as in cross-fertilization, but usually requires more care.