In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Let me give you an example: Passage: Nearing London, Oliver encounters Jack Dawkins, a pickpocket more commonly known by the nickname the "Artful Dodger", and his sidekick, a boy of a humorous nature named Charley Bates, but Oliver's innocent and trusting nature fails to see any dishonesty in their actions. The Dodger provides Oliver with a free meal and tells him of a gentleman in London who will "give him lodgings for nothing, and never ask for change". Grateful for the unexpected assistance, Oliver follows the Dodger to the "old gentleman's" residence. In this way Oliver unwittingly falls in with an infamous Jewish criminal known as Fagin, the gentleman of whom the Artful Dodger spoke. Ensnared, Oliver lives with Fagin and his gang of juvenile pickpockets in their lair at Saffron Hill for some time, unaware of their criminal occupations. He believes they make wallets and handkerchiefs.
The answer to this example can be: Who believes Fagin's gang make wallets and handkerchiefs?.
Here is why: This question is based on the following sentence in the passage "He believes they make wallets and handkerchiefs". It evaluates the understanding that the pronoun "he" refers to name "Oliver". You can ask questions like this one about most pronouns in a paragraph.

OK. solve this:
Passage: While Leonard Harrison and Colton Point State Parks and parts of the surrounding Tioga State Forest are now the Pine Creek Gorge National Natural Landmark, it is their status as part of a Pennsylvania State Natural Area that provides the strongest protection for them. Within this Natural Area, all logging, mining, and oil and gas drilling are prohibited, and only foot trail access is allowed. In 1988 the Pennsylvania Department of Environmental Resources, precursor to the DCNR, described it as about 95% State owned, unroaded, and designated the Pine Creek Gorge Natural Area. It is a place of unique geologic history and contains some rare plant communities, an old growth hemlock stand, ... active bald eagle nest[s] ... and is a major site of river otter reintroduction. Departmental policy is protection of the natural values of the Canyon from development and overuse, and restoration of the area to as near a natural condition as possible.
The gorge has over 225 species of wildflowers, plants and trees,  with scattered stands of old growth forest on some of its steepest walls. The rest of the gorge is covered with thriving second growth forest that can be over one hundred years old. However, since clearcutting, nearly 90 percent of the forest land has burnt at least once. Typical south-facing slopes here have mountain laurel below oak and hickory trees, while north-facing slopes tend to have ferns below hemlocks and hardwoods. Large chestnuts and black cherry can also be found.The Grand Canyon of Pennsylvania is known for its fall foliage, and Leonard Harrison State Park is a popular place to observe the colors, with the first three weeks of October as the best time to see the leaves in their full color. Red leaves are found on red maple, red oak, and black cherry, while orange and yellow leaves are on black walnut, sugar maple, aspen, birch, tulip poplar and chestnut oak, and brown leaves are from beech, white oak, and eastern black oak trees. Plants of "special concern" in Pennsylvania that are found in the gorge include Jacob's ladder, wild pea, and hemlock parsley.
Answer:
What are the three listed plants of "special concern" that are found in the gorge that has over 225 species of wildflowers?