In a hospital, you suddenly wake up, wracked with pains. There are tubes in your arm. Over you is standing a doctor. You feel bloated somehow.
"You're awake!" says the doctor.
"What day is it?" you ask.
The doctor gives you the date. "It's over a week later!" you yell. "I must have been asleep for a long time."
You look down at yourself. Impossibly, you seem pregnant. You realize your pain is contractions.
"You were full of pollen," explains the doctor. You remember that pollen is what a plant uses to reproduce, like sperm. "We don't know exactly what happened, but you're pregnant. It's developing fast, around a month per day." You remember how fast some vines can grow--certainly a lot faster than humans.
"Then the birth--?"
"It's coming."
The doctor gives you something to make you feel numb. In an hour the baby is born. It's a girl. You are relieved to see that it doesn't look like a monster. But it has green skin and hair, and its fingernails and toenails seem to be like bark.
You go back to your dorm room and tell everyone what happened. They can't believe it until they see the baby. In the upcoming months the baby grows fast and learns even faster. When your half-plant daughter is teenage, the doctor tells you the fast growth has stopped.