Astragalus zibaishanensis P. L. Liu & L. L. Xun, 2025
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publication ID |
https://doi.org/10.3897/phytokeys.266.170977 |
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DOI |
https://doi.org/10.5281/zenodo.17651202 |
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persistent identifier |
https://treatment.plazi.org/id/74EA866E-7C02-5E96-8E6E-6C707FDBB0BA |
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treatment provided by |
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scientific name |
Astragalus zibaishanensis P. L. Liu & L. L. Xun |
| status |
sp. nov. |
Astragalus zibaishanensis P. L. Liu & L. L. Xun , sp. nov. (A. sect. Cenantrum Bunge)
Figs 2 View Figure 2 , 3 View Figure 3
Type.
China • Shaanxi Province, Fengxian County, north slope of Mt. Zibaishan , 33°41'49.6"N, 106°45'21.3"E, on stony slope in grasses, 2311 m above sea level (a. s. l.), 13 June 2023, P. L. Liu 1458 ( Holotype, WUK!; Isotypes, WUK!, WNU!) GoogleMaps .
Diagnosis.
This new species is similar to A. monadelphus , A. xitaibaicus and A. neomonodelphus by having yellow petals, pseudomonadelphous androecium, and stipitate legumes, but can be distinguished by its stem 0.9–1.5 mm in diameter; leaflets 5–7, hairy adaxially and abaxially; calyx teeth triangular, ca. 0.5 mm long; standard 17–20 mm long; wings 18–21 mm long; keels 17–20 mm long; pistil glabrous; legume glabrous, with a stipe 10–11 mm long (Table 1 View Table 1 ).
Description.
Perennial herbs, 20–30 cm tall; main root 6–10 mm in diameter. Stems cespitose, ascending, unbranched, slightly zigzag, slender, 0.9–1.5 mm in diameter; internodes sparsely pubescent or glabrous. Leaves imparipinnate, alternate, 7–11 cm long; stipules free, often reflexed, lanceolate or ovate, 6–9 × 1–3 mm, brown or green, glabrous; rachises sparsely pubescent or glabrous; leaflets 5–7, opposite; petiolules 1.0– 1.5 mm long, pubescent; leaflet blades ovate or oblong, 15–30 × 7–15 mm, with white appressed simple hairs adaxially and abaxially, base wide cuneate or rounded, apex retuse or obtuse. Peduncles axillary, 3–8 cm long, sparsely pubescent or glabrous; racemes with 9–15 flowers; pedicels 4–5 mm long, sparsely pubescent; bracts lanceolate, 7–9 × 1.5–2.5 mm, glabrous. Calyx 6–7 mm long, inner side of calyx teeth with brown hairs, other parts of calyx glabrous; calyx teeth 5, triangular, equal, ca. 0.5 mm long. Petals light yellow; standard obovate, 17–20 × 7–8 mm, apex retuse or rounded, base attenuate; wings 18–21 × 1.8–2.0 mm, auricle narrowly triangular, ca. 1 mm long, claw 11–14 mm long; keels 17–20 × 2.5–3.0 mm, auricle triangular, ca. 0.8 mm long; androecium pseudomonadelphous, 18–21 mm long, the vexillary stamen (the single stamen which is close to the standard) is attached to other nine fused filaments at middle, and free from the fused filaments at base and apex; pistil 17–21 mm long, glabrous, stipe 7–10 mm long, style 4–5 mm long. Legume glabrous, with a stipe 10–11 mm long, inflated, unilocular, outline lanceolate, 18–22 mm long (excluding stipe), 5–6 mm wide. Seeds black-brown, 3.5–4.0 × 2.0– 2.5 mm.
Phenology.
Flowering in May and June; fruiting in June and July; seeds mature in July.
Distribution and habitat.
Astragalus zibaishanensis is distributed on the north slope of Mt. Zibaishan in Fengxian County, Shaanxi, China (Fig. 4 View Figure 4 ). It grows on stony slope in forest, 2300–2400 m a. s. l.
Etymology.
The epithet zibaishanensis derives from the type locality of the new species, Mt. Zibaishan (紫柏山). The Chinese vernacular name for this new species is 紫柏山黄耆 (zǐ bǎi shān huáng qí).
Other specimens checked ( Paratypes).
China • Shaanxi Province, Fengxian County, north slope of Mt. Zibaishan , 33°41'47.0"N, 106°45'18.7"E, 2380 m a. s. l., 24 May 2022, P. L. Liu 1454 ( WUK!, WNU!) GoogleMaps ; • same locality, 33°41'43.0"N, 106°45'10.3"E, 2391 m a. s. l., 24 May 2022, P. L. Liu 1455 ( WUK!) GoogleMaps ; • same locality, 33°41'47.0"N, 106°45'18.3"E, 2385 m a. s. l., 16 July 2025, P. L. Liu 1757 ( WUK!) GoogleMaps .
Citations of comparative species.
Astragalus monadelphus Bunge ex Maxim., Bull. Acad. Imp. Sci. Saint-Pétersbourg 24: 32. 1878. Lectotype ( Podlech and Sytin 1996): West China, Prov. Kansu, vii 1872, Prezewalski ( LE, sheet marked as lectotypus; drawing and fragments at K!); isolectotypes: LE, P, PE!.
Astragalus xitaibaicus (K. T. Fu) Podlech & L. R. Xu, Novon View in CoL 14 (2): 222. 2004. Holotype: Shaanxi, Xitaibai Shan, Dingpeng Shan , alt. 3300 m, in grassland on mountain ridge, 9 August 1957, Kun-Tsun Fu 10321 ( WUK!); isotype: WUK!.
Astragalus neomonodelphus H. T. Tsai & T. T. Yu, Bull. Fan Mem. Inst. Biol. Bot. View in CoL 9: 263. 1940. Holotype: Yunnan, Chungtien, Sianrentung , alt. 3400 m, grassy slope, herb, fl. yellow, 12 July 1937, T. T. Yü 12120 ( KUN); isotypes: PE!, HUH!.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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