Youngia hangii T. Deng, D.G. Zhang, Qun Liu & Z.M. Li, 2021

Liu, Qun, Huang *, Gui-Yun, Zhang, Dai-Gui, Zhang, Jian-Wen, Deng, Tao & Li 1, Zhi-Min, 2021, Youngia hangii (Asteraceae, Crepidinae), a new species from Hubei, China, PhytoKeys 182, pp. 27-38 : 27

publication ID

https://dx.doi.org/10.3897/phytokeys.182.71063

persistent identifier

https://treatment.plazi.org/id/51E31F18-D526-526C-84F8-B676EDD58ACD

treatment provided by

PhytoKeys by Pensoft

scientific name

Youngia hangii T. Deng, D.G. Zhang, Qun Liu & Z.M. Li
status

sp. nov.

Youngia hangii T. Deng, D.G. Zhang, Qun Liu & Z.M. Li View in CoL sp. nov.

Type.

China. Hubei: Wufeng County, Renheping , 30°06'27"N, 110°16'31"E, karst cave of karst topography, 500-800 m alt., 5 August 2018, Daigui Zhang & Qun Liu HAC 001 (holotype KUN (KUN1511675); isotypes KUN (KUN1511676), JSU (HHE 3256)) GoogleMaps .

Description.

Herbs, perennial, 20-35 cm tall. Taproot straight or slightly oblique, fleshy, with lateral roots (Fig. 2D View Figure 2 ). Stems erect, branched from the base, with sparse white simple hairs; stem base ribbed, with 1 or 2 leaves similar to basal leaves. Basal leaves crowded at the caudex base; petiole 2-3 cm long; blade oblanceolate, 6-18 × 2-4 cm, both surfaces short pubescent with white hairs 0.1-0.3 mm long (pubescence more evident on veins), bipinnate to pinnatifid, apical lobe halberd-shaped, apex acute-acuminate, margin deeply lobed; lateral lobes 5-10 pairs, opposite or slightly skewed, irregularly halberd-shaped (lateral lobes tapering to the base, serrate, lowermost lobes narrowly triangular), often with 1-3 pairs of triangular or oblique-ovate lobes between lateral lobes. Synflorescence corymbiform; capitula 7-10. Involucre ampullate, 3-4 mm long, 3 mm in diameter. Phyllaries in 4 rows, greyish-green; outer phyllaries 5-7, ovoid-triangular, ca. 1 × 1 mm, apex acute; inner phyllaries 7-9, lanceolate, 2-4 × 0.5-1 mm, margin white-membranous, apex acute; florets 8-10, ligules 4-6 × 1-2 mm, teeth 0.2-0.4 mm long, tube 3-4 mm; anther tube ca. 2.5 mm long; style branches ca. 0.5 mm long. Outer achenes black, fusiform, 2 mm long, apex attenuate to shortly beaked and expanded again into the pappus disc; ribs 12-14; pappus white, bristles rough, 3 mm long; inner achenes similar to the outer ones, 2.5 mm long.

Phenology.

Flowering and fruiting April to October.

Vernacular name.

五峰黄鹌菜, wǔ fēng huánɡ ān cài in Chinese Pinyin.

Etymology.

The species epithet honours Prof. Hang Sun (b. 1963), a Chinese botanist who has conducted research on plant taxonomy, floristics, biogeography and evolutionary biology and inspired many people through his work. He has also given a lot of support to the plant research work in Hubei.

Distribution and habitat.

Youngia hangii is known only from the type locality, Renheping in Wufeng Xian, Hubei, China; 500-1000 individuals are known along the edge of some small caves at the base of the karst hillside (Fig. 2A, B, C View Figure 2 ); at altitudes of 500-800 m.

Morphological assessment.

Morphological characteristics suggest that Y. hangii is related to Y. rubida and Y. heterophylla owning 10-25 florets and resembles Y. rosthornii with bipinnately deeply partite leaves. The achenes of Y. hangii and Y. rubida are attenuated into a short beak, which is widened into the pappus disc. Several unique features including the shape, lobes and size of the leaves, the leaves with white simple hairs (Fig. 2E, F, G View Figure 2 ; Fig. 3F, G View Figure 3 ), phyllaries, number of florets and achenes differentiate Y. hangii from Y. rubida and Y. heterophylla (Table 1 View Table 1 ).

Phylogenetic analysis.

The Bayesian tree showing PP support, ML bootstrap (LP) and MP bootstrap (BP) values for each clade are presented in Fig. 1 View Figure 1 . The species in clade Ι form a monophyletic group with PP = 0.97, but LP are with weak support and BP are in conflict with PP and they were instead with “-”, respectively in Fig. 1 View Figure 1 . Youngia hangii is nested within Clade I as sister to Y. rubida with strong support (PP = 1, LP = 83, BP = 88).

Kingdom

Plantae

Phylum

Tracheophyta

Class

Magnoliopsida

Order

Asterales

Family

Asteraceae

Genus

Youngia