Combo photo taken on Oct. 10, 2021 shows a sample of Manglietiastrum sinicum collected by researchers in the wild (L) and a transplanted Manglietiastrum sinicum plant growing in the Kunming Botanical Garden in Kunming, southwest China's Yunnan Province. Kunming Botanical Garden has built a garden featuring Plant Species with Extremely Small Populations (PSESP) since 2015. Currently, a total of 44 rare target species have been transplanted into the garden under protection efforts. (Xinhua/Wang Nan)

Combo photo taken on Oct. 10, 2021 shows a sample of Christensenia assamica collected by researchers in the wild (L) and a transplanted Christensenia assamica plant growing in the Kunming Botanical Garden in Kunming, southwest China's Yunnan Province. Kunming Botanical Garden has built a garden featuring Plant Species with Extremely Small Populations (PSESP) since 2015. Currently, a total of 44 rare target species have been transplanted into the garden under protection efforts. (Xinhua/Jin Liwang)

Combo photo taken on Oct. 10, 2021 shows a sample of Pinus squamata, or the Qiaojia pine, collected by researchers in the wild (L) and a transplanted Qiaojia pine growing in the Kunming Botanical Garden in Kunming, southwest China's Yunnan Province. Kunming Botanical Garden has built a garden featuring Plant Species with Extremely Small Populations (PSESP) since 2015. Currently, a total of 44 rare target species have been transplanted into the garden under protection efforts. (Xinhua/Jin Liwang)

Combo photo taken on Oct. 10, 2021 shows a sample of Craigia yunnanensis collected by researchers in the wild (L) and a transplanted Craigia yunnanensis plant growing in the Kunming Botanical Garden in Kunming, southwest China's Yunnan Province. Kunming Botanical Garden has built a garden featuring Plant Species with Extremely Small Populations (PSESP) since 2015. Currently, a total of 44 rare target species have been transplanted into the garden under protection efforts. (Xinhua/Jin Liwang)

Combo photo taken on Oct. 10, 2021 shows a sample of firmiana major collected by researchers in the wild (L) and a transplanted firmiana plant growing in the Kunming Botanical Garden in Kunming, southwest China's Yunnan Province. Kunming Botanical Garden has built a garden featuring Plant Species with Extremely Small Populations (PSESP) since 2015. Currently, a total of 44 rare target species have been transplanted into the garden under protection efforts. (Xinhua/Wang Nan)

Combo photo taken on Oct. 10, 2021 shows a sample of Cyclobalanopsis sichourensis collected by researchers in the wild (L) and a transplanted Cyclobalanopsis sichourensis plant growing in the Kunming Botanical Garden in Kunming, southwest China's Yunnan Province. Kunming Botanical Garden has built a garden featuring Plant Species with Extremely Small Populations (PSESP) since 2015. Currently, a total of 44 rare target species have been transplanted into the garden under protection efforts. (Xinhua/Jin Liwang)

   (Editor: Yang Mei)