Tiên Hiêp Nguyên

Xanthocyparis is a genus of cypresses in the family Cupressaceae. As of August 2021, it has only one species, Xanthocyparis vietnamensis, native to Vietnam and southeast China. It is commonly known as the Vietnamese golden cypress. The Nootka cypress, Cupressus nootkatensis or Callitropsis nootkatensis, was also placed in the genus, but this has been rejected.

Cycas aculeata is a species of cycad in the genus Cycas, native to Vietnam, where it is endemic to a single site on the south slopes of the Hai Van Pass. It has a short subterranean stem 15–18 cm diameter, which bears 6-23 leaves. The leaves are 1.8-2.5 m long, and pinnate, with 100-150 leaflets and several basal spines; they are glossy dark green, but covered in orange pubescence at first which soon wears off. The leaflets are 35–52 cm long and 13–19 mm wide, and the basal spines . The name derives from the Latin aculeatus, which translates as "prickly", indeed has short prominent spikes

Calocedrus rupestris is a species of conifer recently discovered in highly eroded rocky limestone mountains in northern Vietnam and first described in 2004. It also occurs in China. Calocedrus rupestris is a medium-sized tree growing up to about 25 meters tall, with a trunk up to 1.2 meters in diameter. Many of the specimens observed in the wild were estimated to be some 600 to 800 years old, on the basis of preliminary year-ring observations. It occurs together with other lime-adapted species in highly endemic relict coniferous forest. However, the ecological region extends from Vietnam into

Cycas collina is a species of cycad. It is found in the Mai Sơn area of Sơn La Province, Vietnam.

Cycas brachycantha is a species of cycad in the genus Cycas, native to northern Vietnam where it is endemic to Bắc Kạn Province. It grows in often soil-free cracks and crevices of limestone crests and ridges under the canopy of evergreen forests. It is found in Ba Bể National Park. It has a short stem 9–10 cm diameter, often subterranean, or up to 1 m tall above ground, bearing 5-10 leaves. The leaves are 1.4-2.5 m long, slightly keeled to flat, very glossy dark green, pinnate, with 100-210 leaflets, each leaflet 20–25 cm long and 10–14 mm wide, angled forward at 70-85°; the leaf apex has a

Xanthocyparis is a genus of cypresses in the family Cupressaceae. As of August 2021, it has only one species, Xanthocyparis vietnamensis, native to Vietnam and southeast China. It is commonly known as the Vietnamese golden cypress. The Nootka cypress, Cupressus nootkatensis or Callitropsis nootkatensis, was also placed in the genus, but this has been rejected.

Cycas lindstromii is a species of cycad endemic to southern Vietnam. It is found in Ba Ria-Vung Tau, Binh Thuan, Khanh Hoa, and Ninh Thuan provinces, Vietnam.

Cycas hoabinhensis is a species of cycad endemic to central Vietnam, where it is found in Hòa Bình, Hà Nam, Hà Tây, and Ninh Bình provinces.

Cycas fugax is a species of cycad which is endemic to Vietnam. It has only been recorded in the wild from Phu Tho Province and Hanoi. It is also commonly cultivated in Hanoi.

Cycas dolichophylla is a species of cycad in northern Vietnam and southern China.

Amentotaxus hatuyenensis is a species of conifer in the yew family, Taxaceae. It is a shrub or tree endemic to northern Vietnam. This is an endangered species with a total population of fewer than 250 mature individuals limited to Hà Giang Province in northern Vietnam. They grow in various types of forest on karst formations. They may be found alongside conifers such as Pinus fenzeliana, Tsuga chinensis, Cephalotaxus mannii, Podocarpus neriifolius, Nageia fleuryi, and Podocarpus pilgeri. There are also many epiphytes such as orchids in the habitat.

Livistona halongensis is a species of palm first collected in Ha Long Bay, Vietnam, in 1999. The species was described by Tiên Hiêp Nguyên and Ruth Kiew in 2000. It is a fan palm.

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Impatiens halongensis is a species in the family Balsaminaceae, native to Vietnam. It was collected in Hạ Long Bay in 1999, which is how the species got its name.

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Pinus cernua is a pine species, Pinaceae. It is critically endangered.

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Paraboea halongensis is a plant in the family Gesneriaceae, native to Vietnam. The specific epithet halongensis is for Hạ Long Bay, where the species is found.

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