Lysimachia daqiaoensis G. D. Tang & R. Z. Huang 2020, sp. nov.
Creators: name: Huang, Rui-Zhou
name: Liao, Miao
name: Han, Wei
name: Yang, Yuan-Zhi
name: Zhou, Ming-Yi
name: Feng, Han-Hua
name: Tang, Guang-Da
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Ericales
Primulaceae
Lysimachia
Lysimachia daqiaoensis

description: Lysimachia daqiaoensis G.D.Tang & R.Z.Huang, sp. nov. (Figs. 1 & 2).
Type:— CHINA. Guangdong: Ruyuan County, Daqiao Town, 24°56’20.86’’ N, 113°06’20.48” E, in a limestone cave, elev. ca. 480 m, 14 May 2019, Guang-Da Tang, Rui-Zhou Huang, Miao Liao & Wei Han GD 190501 (holotype CANT!; isotypes IBSC!).
Diagnosis:— Lysimachia daqiaoensis is similar to L. rupestris F.H.Chen & C.M.Hu (1979: 40) in having rosette leaves and being glabrous all the plants, but the former has no stolons, racemose inflorescences and solitary flowers, longer filaments (ca. 5 mm), and shorter (ca. 0.8 mm) and dorsifixed anthers opening by lateral slits, while the latter has obvious stolons, solitary flowers only, shorter filaments (ca. 1 mm), and longer (4–5 mm) and basifixed anthers opening by apical pores.
Herbaceous perennial, glabrous. Rhizome subterete, less than 1 cm, 5–8 mm in diameter, branched at the apex of the rhizome, densely white or brown crystals, no stolons. Leaves thickly papery to thinly leathery, spirally arranged, congested at the apex of the rhizome, forming a rosette, elliptic-oblanceolate, long oblanceolate, 2.5–12 × 1.2–3.5 cm, tapering towards the base, margin entire and revolute narrowly, apex acute to obtuse; petiole 0.6–2.5 cm long, narrowly winged, white or brown crystals on both sides; veins 2 or 4 pairs, inconspicuous on two sides; veinlets invisible adaxially when drying. Racemose inflorescences, ca. 8-flowered, axillary. Peduncles 1.6–2.5 cm long, densely white or brown crystals. Bract Linear, 3–5 mm, borne from the base of pedicel. And some flowers solitary. Calyx lobes triangular, ca. 4× 1.2 mm, separate to near the base, apex acuminate, densely white or brown crystals, veins inconspicuous. Corolla yellow, separate near to base, lobes imbricate, lanceolate to elliptic, 7–9 mm × ca. 3 mm, apex obtuse to emarginate, glabrous, red stripe at base. Stamens 5, filaments ca. 5 mm long, connate basally into a tube; anthers ca. 0.8 mm long, ca. 0.6 mm in diameter, dorsifixed, opening by lateral slits. Ovary globose, glabrous, ca. 1 mm in diameter; style ca. 6 mm long, glabrous. Capsule subglobose, ca. 3 mm in diameter. Calyx and style persistent in fruit. Fruit stalk curve toward wet rock when ripening.
Phenology:—The flowering of Lysimachia daqiaoensis is from April to May; and the fruiting from July to September.
Distribution:— Lysimachia daqiaoensis is only found from the type locality in Daqiao Town, Ruyuan County, Shaoguan City, Guangdong Province, China.
Habitat:— Lysimachia daqiaoensis was observed to grow on limestone walls of a wet cave at an elevation of ca. 480 m.
IUCN Red List category:—Only one population is found from the type locality. Religious and other human activities in and around the cave seriously threaten the survival of the species. The status of the new species should be Critically Endangered category (CR) based on current information and the International Union for Conservation of Nature and Natural Resources guidelines (IUCN 2019).
Etymology:—The species epithet refers to the town where this new species was found.
Additional specimens examined (paratypes):— CHINA. Guangdong: Ruyuan County, Daqiao Town, 24°56’20.86’’ N, 113°06’20.48” E, in a limestone cave, elev. ca. 480 m, 18 July. 2019, Guang-Da Tang, Wei Han GD190502 (IBSC!).
description: Published as part of Huang, Rui-Zhou, Liao, Miao, Han, Wei, Yang, Yuan-Zhi, Zhou, Ming-Yi, Feng, Han-Hua & Tang, Guang-Da, 2020, Lysimachia daqiaoensis (Primulaceae), a new cave species from Guangdong, China, pp. 41-45 in Phytotaxa 430 (1) on pages 41-44, DOI: 10.11646/phytotaxa.430.1.6, http://zenodo.org/record/13876061