Question: Which is native to Western China, Petrocosmea or Onoclea?
Context: Petrocosmea is a genus of the family Gesneriaceae, the African violet family.  Most of the species within this genus are endemic to high-altitude areas in Western China, although some are native to other parts of Asia.  It is a rosette forming genus that generally grows on wet mossy rocks or forests. Fritillaria thunbergii is an Asian plant species of the lily family.  It is native to Kazakhstan and in Xinjiang Province of western China, though cultivated in other places and naturalized in Japan and in other parts of China. Askellia pygmaea (dwarf alpine hawksbeard) is a species of Asian and North American plants in the dandelion tribe within the sunflower family.  It is native to western, northern, and eastern Canada (Yukon, Northwest Territories, British Columbia, Alberta, Nunavut, Quebec, Labrador, Newfoundland), the western United States (Alaska, Montana, Wyoming, Colorado, Idaho, Utah, Nevada, Washington, Oregon, California), Russia, Mongolia, Kazakhstan, and western China (Tibet + Xinjiang). Onoclea is a genus of plants in the Onocleaceae family, native to moist habitats in eastern Asia and eastern North America.  They are deciduous ferns with sterile fronds arising from creeping rhizomes in spring, dying down at first frost.  Fertile fronds appear in late summer.  Depending on the authority, the genus contains one to five species. Petrocosmea forrestii is a species of flowering plant in the family Gesneriaceae native to China, and sometimes cultivated as a houseplant.  It grows among rocks in shady places.  Like other species in its genus, it does not develop a stem above ground, but spreads by rhizomes.  The entire rosette of leaves is less than 15 cm in diameter. The Turkic languages are a language family of at least thirty-five languages, spoken by Turkic peoples from Eastern Europe and the Mediterranean to Siberia and Western China.  The Turkic languages originated in a region of East Asia spanning Western China to Mongolia, where Proto-Turkic is thought to have been spoken, according to one estimate, around 2,500 years ago, from where they expanded to Central Asia and farther west during the first millennium. China Western Development (), also China's Western Development, Western China Development, Great Western Development Strategy, or the Open Up the West Program is a policy adopted for the western regions. Yao Xing (; 366–416), courtesy name Zilüe (子略), formally Emperor Wenhuan of (Later) Qin ((後)秦文桓帝), was an emperor of the Chinese/Qiang state Later Qin.  He was the son of the founding emperor Yao Chang (Emperor Wucheng).  For most of his reign, he did not use the title of emperor, but used the title Heavenly Prince ("Tian Wang").  During his reign, he destroyed the rival Former Qin and proceeded to expand his hegemony over nearly all of western China, as he temporarily seized all of Western Qin's territory and forced Southern Liang, Northern Liang, Western Liáng, and Qiao Zong's Western Shu (西蜀) all to at least nominally submit to him, but late in his reign, defeats on the battlefield, particularly at the hands of the rebel general Helian Bobo (who founded Xia), and internecine struggles between his sons and nephews greatly damaged the Later Qin state, and it was destroyed soon after his death.  Yao Xing was an avid Buddhist, and it was during his reign that Buddhism first received official state support in China.  The monk Kumarajiva also visited Chang'an at Yao Xing's request in 401. Western China (, or rarely ) is the west of China.  In the definition of the Chinese government, Western China covers one municipality: Chongqing; six provinces: Sichuan, Guizhou, Yunnan, Shaanxi, Gansu, and Qinghai; and three autonomous regions: Tibet, Ningxia, and Xinjiang. Zhuang Xueben (; 1909–1984) was one of China’s first ethnographic photographers.  In the 1930s, he left his native Shanghai and travelled to western China to photograph the minority people in four provinces: Sichuan, Yunnan, Gansu, and Qinghai.  During the almost ten years of ethnographic research, he took more than ten thousand photographs and wrote a vast amount of materials including research reports, travel notes, and journals.  In 1941, he held a photographic exhibition on Xikang in several Chinese cities and about 200,000 people attended the exhibit.  These photos and written materials have become a valuable source for anthropologists to the ethnic groups in western China.
Answer: Petrocosmea