Hansenia trifoliolata Q.P.Jiang & X.J.He, 2022

Jiang, Qiu-Ping, Price, Megan, Zhang, Xiang-Yi & He, Xing-Jin, 2022, Hansenia trifoliolata, a new species (Apiaceae) from Shaanxi, China, PhytoKeys 213, pp. 79-93 : 79

Hansenia trifoliolata Q.P.Jiang & X.J.He sp. nov.

Figs 1 , 5

Diagnostic characters.

Monocarpic. Root cylindrical, branched or partial rhizomes. Leaves 3-foliolate. Umbels 2-5 cm across, rays 3-7, unequal. Stylopodium conical. Fruits are obovoid-oblong or long-ellipsoid, have 5 ribs, ribs prominent to narrow-winged and endosperm (at commissural side) concave. It is clearly distinguished from H. phaea and H. himalayensis in leaves (ternate-1-2-pinnate and 3-pinnate vs. 3-foliolate). Compared to other Hansenia species (i.e. H. forrestii , H. oviformis and H. forbesii ), H. trifoliolata also shows distinctive morphological characters, especially in fruits characters (shape and ribs) and leaves (3-foliolate is unique in Hansenia ).

Type.

China, Shaanxi Province: Tongtianhe National Forest Park, Feng County, elevation 2430 m a.s.l., 34°14'N, 106°33'E, 28 Sep 2021, Q. P. Jiang, JQP21092801, fruiting (Holotype: SZ) .

Description.

Biennial, herb, 60-90 cm high. Root cylindrical, branched or partial rhizomes. Stem purplish-green, thinly ribbed, glabrous, thin. Leaves 3-foliolate, green, blade broad-triangular, irregularly doubly serrate, teeth mucronate; central leaflets cuneate-obovate or rhombic, 4-6 × 2-3.5 cm, with irregularly doubly serrate, base cuneate; lateral leaflets oblique-ovate, base oblique, often shallowly or deeply uneven 2-parted or not divided, 2-5 × 3.5-6.5 cm. Basal petioles 15-20 cm, petioles shorten upwards; sheaths narrow-oblong, glabrous, with margin irregularly coarse-cuspidate-serrate. Umbels 20-50 mm across; peduncles 5-20 mm long, glabrous; bracts 0 to 2, linear; rays 3 to 7, 5-25 mm long, glabrous; bracteoles 2 to 7, linear, 3-8 mm long; raylets 5 to 11, 1-3 mm long. Flowers unknown; calyx teeth ovate-triangular, 0.3-0.5 mm; petals unknown; stylopodium conical. Fruit obovoid-oblong or long-ellipsoid, 1.4-2.1 × 4-6 mm; mericarps 5-ribbed, ribs prominent to narrow-winged; vittae 3 (4) in each furrow, 2-5 on commissure; endosperm (at commissural side) concave, commissure width 0.8-1.35 mm.

Etymology.

The specific epithet refers to the distinctive 3-foliolate leaves.

Phenology.

Flowering from July to August, and fruiting from August to September.

Distribution, habitat and ecology.

At present, this new species has only been found in the type locality in Tongtianhe National Forest Park, Feng County, Shaanxi Province, China. According to the growing environment, we speculate it may inhabit forests at an elevation of 2300 m to 2500 m in western Shaanxi Province and south-eastern Gansu Province. This new species grows in humid environments under the forests.

Additional specimens examined

(paratypes). China: Shaanxi Province, Baoji City, Feng County, Tongtianhe National Forest Park , elevation 2430 m a.s.l., 34°14'N, 106°33'E, 20 Aug 2019, Q. P. Jiang and X. Y. Zhang, JQP19082004 (photo SZ!) .

Figures

Figure 1. Hansenia trifoliolata in the field A, B habitat C cauline leaves D basal leaves E, F umbels and fruits.

Figure 5. Holotype of Hansenia trifoliolata, fruiting. Vouchers: JQP 21092801.