taxonID	type	description	language	source
ED5D87D9FFBAFFC0C0F827D432AEF8EA.taxon	description	Sin. 15 (1978: 142); Tanaka in J. Jpn. Bot 74 (1999: 265); Ho in Ill. Fl. Vietnam 3 (1993: 585); Yang & Li in Acta Bot. Yunnan., Suppl. 3 (1990: 82); Yang in Fl. Yunnan. 7 (1997: 673, t. 216, f. 3 & 4); Li et al. in Fl. Guangxi 5 (2016: 216, Figs. 1 ‒ 6.).	en	Feng, Hui Zhe, Peng, Cai Xia, Tan, Kun, Lin, Qin Wen (2025): Identity of Ophiopogon tonkinensis and O. ogisui, with a new species O. tiandengensis from Guangxi, China. Phytotaxa 700 (1): 45-59, DOI: 10.11646/phytotaxa.700.1.4, URL: https://doi.org/10.11646/phytotaxa.700.1.4
ED5D87D9FFBAFFC0C0F827D432AEF8EA.taxon	materials_examined	Type: — VIETNAM. Tokin. Lang-Son: environs de Van Linh, alt. 100 m, November 1926, P. A. Pételot & M. E. Colani s. n. (holotype: P 00509925 photo!).	en	Feng, Hui Zhe, Peng, Cai Xia, Tan, Kun, Lin, Qin Wen (2025): Identity of Ophiopogon tonkinensis and O. ogisui, with a new species O. tiandengensis from Guangxi, China. Phytotaxa 700 (1): 45-59, DOI: 10.11646/phytotaxa.700.1.4, URL: https://doi.org/10.11646/phytotaxa.700.1.4
ED5D87D9FFBAFFC0C0F827D432AEF8EA.taxon	materials_examined	Type: — CHINA, Guangxi, Longzhou (ḭffl, in Tamura & Xu (2007) it was misspelled as longzhu), Jinlong, Gaoshan, Banbi, ca 440 m a. s. l., Mikinori Ogisu 250 (holotype: PE 01842104!).	en	Feng, Hui Zhe, Peng, Cai Xia, Tan, Kun, Lin, Qin Wen (2025): Identity of Ophiopogon tonkinensis and O. ogisui, with a new species O. tiandengensis from Guangxi, China. Phytotaxa 700 (1): 45-59, DOI: 10.11646/phytotaxa.700.1.4, URL: https://doi.org/10.11646/phytotaxa.700.1.4
ED5D87D9FFBAFFC0C0F827D432AEF8EA.taxon	description	Description: — Herb lithophytic, evergreen, perennial, acaulescent, densely clustered, completely glabrous. Rhizome stout and abbreviated; old roots reddish brown, lignified, ca. 3.5 mm in diam; young roots succulent, densely covered with white pubescence, 2.5 – 3 mm in diam. Foliage leaves 5 – 25, clustered on apical part of stem / rhizome, distinctly petiolate; petiole 8 – 32 cm long, 2.5 – 4.8 mm in diam., abaxially of the cross-section circular, adaxially somewhat flat; blade oblanceolate-oblong, acutely at apex, somewhat oblique proximally, 8.3 – 23.5 cm long, 2.0 – 6.3 cm wide, adaxially glossy, deep green, with 21 – 49 longitudinal veins and numerous transverse veinlets, silvery stripes between longitudinal veins on abaxial surface. Peduncle 9.5 – 24 cm tall, 2 mm in diameter, purple, bracteate; sterile bracts 2 – 4, boat-shaped, dark purple, longcentrally pale green, marginally whitish, papery, ca. 1.8 mm long, ca. 5 mm wide, embracing peduncle; inflorescence racemose; erect, 8.5 – 13.5 cm long, ca. 2.5 mm in diameter. Flower hermaphroditic, urceolate, in clusters of 2 or 3 – 4, facing downward, often perpendicularto pedicel, up to 75 per rachis, usually nodding; pedicels terete, in fully open flower 12.5 – 20.5 mm long, 1.5 mm in diameter, jointed with basal stalky part (ca. 1 – 1.5 mm long) of flower, and articulation at the base of the entire peduncle, subtended at base by two bracts which are navicular, dark purple; out bract narrowly triangular, up to ca. 15 mm long, ca. 7.5 mm wide, base contracted into a handle; inner bract is broadly triangular, 5 mm long and 3.8 mm wide. Perianth distally 6 - lobed, pink-purplish dorsally; dark purple inside; lobes in 2 whorls of 3, dimorphic as to shape and size between inner and outer whorls, 1 - nerved; outer lobes elliptic, ca. 5.3 × 3.2 mm wide, excurved distally; inner lobes narrow elliptical, ca. 4.5 × 2.5 mm wide, apically recurved (outer lobes larger, paler in color, more distinctly recurved distally than outer lobes). Stamens 6, arranged almost in 1 whorl, shaped conic in assemblage (androecium); filaments swollen at base, 1.0 – 1.2 mm long, ca. 0.8 mm wide, green; anthers dorsi-basifixed, valvately arranged, triangular, 1.5 – 2.3 mm long, ca. 1.3 mm wide, arrowshaped dehiscence at base, (greenish) yellow. Ovary inferior, 3 - locular superior, septum absent at base to 1 - locular. Style ca. 15 mm long, slender, white, exceeding perianth by 1 mm at maturity. Phenology: — Flowering occurs in November; fruiting from December to August.	en	Feng, Hui Zhe, Peng, Cai Xia, Tan, Kun, Lin, Qin Wen (2025): Identity of Ophiopogon tonkinensis and O. ogisui, with a new species O. tiandengensis from Guangxi, China. Phytotaxa 700 (1): 45-59, DOI: 10.11646/phytotaxa.700.1.4, URL: https://doi.org/10.11646/phytotaxa.700.1.4
ED5D87D9FFBAFFC0C0F827D432AEF8EA.taxon	distribution	Distribution and habitat: — Ophiopogon tonkinensis is distributed in Southwestern Guangxi of China and Northern Vietnam. It grows in shady primary and secondary lowland forests of evergreen broad-leaved trees. Many specimens previously identified as belonging to this species in the herbarium are actually misidentified and belong to other species. Additionally, the distribution of this species in Yunnan requires further confirmation.	en	Feng, Hui Zhe, Peng, Cai Xia, Tan, Kun, Lin, Qin Wen (2025): Identity of Ophiopogon tonkinensis and O. ogisui, with a new species O. tiandengensis from Guangxi, China. Phytotaxa 700 (1): 45-59, DOI: 10.11646/phytotaxa.700.1.4, URL: https://doi.org/10.11646/phytotaxa.700.1.4
ED5D87D9FFB1FFC4C0F8253C350BFD51.taxon	materials_examined	Type: — CHINA. Type herbarium specimen prepared in 22 May 2023 from plants cultivated in Garden of IBSC, C. X. Peng 0373 (holotype: IBSC 9301377!; isotype: IBSC 9301376!), originated from Guangxi, Chongzuo, Tiandeng, Fuxin, Wanxiu, the vicinity of Buxiu, alt. 224 m.	en	Feng, Hui Zhe, Peng, Cai Xia, Tan, Kun, Lin, Qin Wen (2025): Identity of Ophiopogon tonkinensis and O. ogisui, with a new species O. tiandengensis from Guangxi, China. Phytotaxa 700 (1): 45-59, DOI: 10.11646/phytotaxa.700.1.4, URL: https://doi.org/10.11646/phytotaxa.700.1.4
ED5D87D9FFB1FFC4C0F8253C350BFD51.taxon	diagnosis	Diagnosis: — Ophiopogon tiandengensis resembles O. tonkinensis, but can be readily distinguished from the latter by its blade obovate, smaller in size, pedicel articulated in the middle, inflorescence ca. 25 flowered, flower campanulate and lobes not reflexed but somewhat divergent distally; and flowering in May – July (vs. in October to December).	en	Feng, Hui Zhe, Peng, Cai Xia, Tan, Kun, Lin, Qin Wen (2025): Identity of Ophiopogon tonkinensis and O. ogisui, with a new species O. tiandengensis from Guangxi, China. Phytotaxa 700 (1): 45-59, DOI: 10.11646/phytotaxa.700.1.4, URL: https://doi.org/10.11646/phytotaxa.700.1.4
ED5D87D9FFB1FFC4C0F8253C350BFD51.taxon	description	Description: — Herbs, perennial, evergreen. Rhizome very short, ca. 1.5 cm long, 0.6 cm in diam. Roots ca. 4 mm in diam., pubescent. Leaves basal or tufted glabrous; petiole 3 – 5 cm long, ca. 2.5 mm in diam., pale green; blade obovate, 6.5 – 9.1 cm long, 2.2 – 3.2 cm broad, entire, leathery, adaxially green, abaxially pale green with 23 – 28 whitish green longitudinal streaks, basally cuneate and asymmetric, acute at apex. Cataphyll membranous, quickly withering, brown. Scape 5 – 6 cm long, green, glabrous. Inflorescence terminal, reduced panicle 5.5 – 8 cm long, erect, green, glabrous, ca. 25 flowered, in clusters of 2 or 3; outer bract ca. 4 mm long, boat-shaped, centrally pale green, marginally purple, inner bract 0.8 – 1.5 mm long. Flowers hermaphroditic, campanulate, in clusters colate, in clusters of 1 or 2, facing downward. Pedicel articulated, 4.5 – 8.0 mm long; portion below articulation ca. 2 – 3 mm long, dark purple; portion above articulation 2.5 – 5.0 mm long. Perianth ca. 5.5 mm long, ca. 6.5 mm in diam., purplish; lobes 6, oblong to elliptic, apex reflexed, 4.5 – 5 mm long, 2 – 2.5 mm broad. Stamens 6, ca. 2 mm long, introrse; filaments free, ca. 1 mm long, ca. 0.5 mm broad, pale green; anthers ovoid, ca. 0.7 mm long, cream. Ovary half inferior, 3 locules at distal part and septum disappears thus locules at base. Style 4.5 mm long, slender, white, exceeding perianth by 1 mm at maturity. Seeds spherical, 1.3 cm in diam. Phenology: — Flowering from May to July.	en	Feng, Hui Zhe, Peng, Cai Xia, Tan, Kun, Lin, Qin Wen (2025): Identity of Ophiopogon tonkinensis and O. ogisui, with a new species O. tiandengensis from Guangxi, China. Phytotaxa 700 (1): 45-59, DOI: 10.11646/phytotaxa.700.1.4, URL: https://doi.org/10.11646/phytotaxa.700.1.4
ED5D87D9FFB1FFC4C0F8253C350BFD51.taxon	distribution	Distribution and habitat: — Ophiopogon tiandengensis is only distributed in the damp valleys on the shady slopes of limestone hills in the southwestern part of Guangxi. In addition to the type locality in Tiandeng County, the species is also distributed in places such as Longzhou County, Jingxi County, Daxin County (see Additional specimens examined).	en	Feng, Hui Zhe, Peng, Cai Xia, Tan, Kun, Lin, Qin Wen (2025): Identity of Ophiopogon tonkinensis and O. ogisui, with a new species O. tiandengensis from Guangxi, China. Phytotaxa 700 (1): 45-59, DOI: 10.11646/phytotaxa.700.1.4, URL: https://doi.org/10.11646/phytotaxa.700.1.4
ED5D87D9FFB1FFC4C0F8253C350BFD51.taxon	etymology	Etymology: — The specific epithet tiandengensis is derived from Tiandeng County, where it was discovered. The Chinese name for Ophiopogon tiandengensis is provided here as “ 天Şȁ ẖặ ” (Tiān děng yán jiē cǎo), “ ȁ ẖặ ” is the common Chinese name for the genus Ophiopogon, while “ 天Ş ” directly translated the specific epithet tiandengensis. Conservation status: — Based on field surveys, the species is widely distributed in southwestern Guangxi, but each population is relatively small. Although some populations are located within protected areas, this plant is sold online as a small bonsai and has high ornamental value, leading to extensive collection that has caused a rapid decline in both population and individual numbers. And its population is estimated to decrease by 50 % in the next ten years. According to the IUCN's A 2 c (IUCN 2024) standard, it is rated as Endangered (EN). Note: — Ophiopogon tiandengensis is similar to O. tonkinensis, but its blades obovate to suboblong (vs. oblanceolate-oblong), 6.5 – 9.1 × 2.2 – 3.2 cm (vs. 8.3 – 23.5 × 2.0 – 6.3 cm), petiole 3 – 5 cm long (vs. 8 – 32 cm long), pedicel portion above articulation 2.5 – 5 mm long (vs. 11 – 19 mm long) and articulated in the middle (vs. articulated in the lower), inflorescence ca. 25 flowered (vs. ca. 51 flowered), flower campanulate and lobes top not reflexed but somewhat divergent distally (vs. urceolate and lobes top reflexed) and flowering from May – July (vs. in November). In addition, Ophiopogon tiandengensis is somewhat similar to O. sinensis Y. Wan & C. C. Huang (1987: 398) (Figs. 10) with their perianth lobes white to light purple and being somewhat divergent distally. O. sinensis was described on the basis of a single specimen, C. C. Huang 12252 (GXMG 0039018!), type herbarium specimen prepared from cultivated plant in GXMG, Nanning, Guangxi, China and origin unknown. Based on Chen & Tamura (2000), Yang & Li (1990) and Yang (1997), this species also distributed in Southeastern Yunnan. In the protologue, the author stated that O. sinensis similar to O. bockianus Diels (1900: 254) but differing by the following characters: leaves oblanceolate-oblong, 3.2 – 4 cm wide; scape shorter (ca. 14 cm long); pedicels longer (12 – 15 mm long); anthers lanceolate (ca. 4.5 mm long), initially coherent but becoming discrete. Thus, there are significant differences between O. tiandengensis and O. sinensis. The leaves of O. sinensis are oblanceolate-oblong to suboblong and petiolate indistinctly. Additionally, the anthers are lanceolate and ca. 4.5 mm long. The most critical difference is that the anthers of O. tiandengensis are initially connate, later free. The differences in these three species are mentioned in Table 1.	en	Feng, Hui Zhe, Peng, Cai Xia, Tan, Kun, Lin, Qin Wen (2025): Identity of Ophiopogon tonkinensis and O. ogisui, with a new species O. tiandengensis from Guangxi, China. Phytotaxa 700 (1): 45-59, DOI: 10.11646/phytotaxa.700.1.4, URL: https://doi.org/10.11646/phytotaxa.700.1.4
ED5D87D9FFB1FFC4C0F8253C350BFD51.taxon	materials_examined	Additional specimens examined: — Ophiopogon tiandengensis. CHINA. Guangxi: Longzhou County, 20 July 2009, R. H. Jiang, W. H. Wu & D. X. Nong H 09218 (IBK 00216917!); Longzhou County, 27 April 2013, L. Wu & Y. Tong 3481 (BNU 0033173!); Longzhou County, 7 May 2014, Z. G. Yan, S. C. Yao & S. G. Wei 451423140507004 LY (GXMG 0128310!); Longzhou County, 28 April 1980, Nonggang Exped. 11823 (IBK 00139109!); Longzhou County, 1 November 1979, Nonggang Exped. 11489 (IBK 00139110); Longzhou County, 3 November 1979, Nonggang Exped. 20733 (IBK 00185093!); Longzhou County, 7 July 2011, Y. S. Huang & Y. B. Liao LZ 622 (IBK 00205600!). Jingxi County, 8 August 2009, W. B. Xu & W. H. Wu 091674 (IBK 00216916!). Daxin County, 20 May 2008, Zhongzhilian 0822 (IBK 00281506!). Ophiopogon tonkinensis. CHINA. Guangxi: Introduced in Guangxi Medicinal Botanical Garden, 9 November 1997, X. C. Huang 7375 (GXMG 0039065!). Longzhou County, 9 November 1956, Z. J. Li 3142 (IBSC 0644273!); Longzhou County, 2 November 2024, H. Z. Feng et al. 202411022 (SYS!); Longzhou County, 12 November 2024, Ting Xu et al. 2321 (SYS!). Ningming County, 23 October 1958, Z. Q. Zhang 13057 (IBK 00139097!). VIETNAM. Northern Vietnam: limestone area allied to Chinese border. Terrestrial herb in primary and secondary evergreen broad-leaved shady lowland forests on limestone at elevations about 400 – 500 m a. s. l, 8 November 2014, Averyanov, L. Vladimirovich & N. M. Duc Averyanov s. n. (LE 01049841 photo!). Lang Son province: Quan Ba District, Can Ty Commune, Sin Suoi Ho Village, around point 23.09566 ºN 105.02142 ºE. Very steep mountain slopes composed of solid highly eroded karstic limestone at elevation 800 – 1000 m a. s. l. Remnants of primary evergreen broad-leaved and coniferous (with Calocedrus rupestris and Xanthocyparis vietnamensis) humid forest. Terrestrial herb in shady place among rocks. 11 October 2019, Averyanov, L. Vladimirovich, K. S. Nguyen, M. T. Viktorovna VR 1551 (LE 01070147 photo! & LE 01067025 photo!). Lao Cai province: Sapa, 21 October 1960, A. L. Takhtajan 385 (LE 01049927 photo!; LE 01049923 photo! & LE 01049848 photo!). Ninh Binh province: Thanh Yen District, Sanh Village, Cuc Phuong National Park, 1 January 2001, N. M. Cuong, D. T. Kien & M. V. Sinh NMC 1300 (P 01850925 photo!). Ha Giang province: Quan Ba District, Bat Dai Son Nature Reserve, Bat Dai Son Commune, Pai Chu Phin Village, around point 23 º 07 ʹ 54 ʺN 104 º 59 ʹ 24 ʺE, elev. 1000 – 1200 m a. s. l., karstic, highly eroded mountains composed of solid marble-like limestone, primary evergreen broad-leaved and coniferous (with Pseudotsuga sinensis) humid forest on steep rocky slopes near mountain tops. Perennial herb up to 25 cm tall, occasionally on the ridge and near mountain top. 21 October 2022, V. D. Nguyen et al. VN-US- 008 (LE 01123895 photo!). TONKIN: November 1885, B. Balansa 280 (P 01850926 photo!); B. Balansa 281 (P 01850927 photo! & P 01850928 photo!).	en	Feng, Hui Zhe, Peng, Cai Xia, Tan, Kun, Lin, Qin Wen (2025): Identity of Ophiopogon tonkinensis and O. ogisui, with a new species O. tiandengensis from Guangxi, China. Phytotaxa 700 (1): 45-59, DOI: 10.11646/phytotaxa.700.1.4, URL: https://doi.org/10.11646/phytotaxa.700.1.4
