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| Hansenia trifoliolata Q.P.Jiang & X.J.He, in Jiang, Price, Zhang & He, 2022. |
Abstract
Hansenia trifoliolata Q.P.Jiang & X.J.He (Apiaceae), is described as new from Shaanxi Province, northwest China. The mericarp features of H. trifoliolata resemble H. himalayensis and H. phaea and molecular phylogenetic analyses (combining ITS and plastid genomes data) suggest that H. trifoliolata is closely related to the group formed by H. oviformis and H. forbesii. The new species H. trifoliolata has unique 3-foliolate leaves and differ from other Hansenia species in its leaves, umbel numbers and size. A comprehensive description of H. trifoliolata is provided, including habitat environment and detailed morphological traits.
Keywords: Apiaceae, Hansenia, new species, phylogenetic analyses
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| Hansenia trifoliolata Q.P.Jiang & X.J.He, in the field A, B habitat C cauline leaves D basal leaves E, F umbels and fruits. |
Hansenia trifoliolata Q.P.Jiang & X.J.He, sp. nov.
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).
Etymology: The specific epithet refers to the distinctive 3-foliolate leaves.
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.
Qiu-Ping Jiang, Megan Price, Xiang-Yi Zhang and Xing-Jin He. 2022. Hansenia trifoliolata, A New Species (Apiaceae) from Shaanxi, China. PhytoKeys. 213: 79-93. DOI: 10.3897/phytokeys.213.83632
