Taraxacum abhorrens Kirschner & Štěpánek, 2025
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publication ID |
https://doi.org/10.11646/phytotaxa.679.1.1 |
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DOI |
https://doi.org/10.5281/zenodo.16717170 |
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persistent identifier |
https://treatment.plazi.org/id/0399F353-FFFD-FFD8-FF78-FEDE4D5ABBCA |
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treatment provided by |
Felipe |
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scientific name |
Taraxacum abhorrens Kirschner & Štěpánek |
| status |
sp. nov. |
46. Taraxacum abhorrens Kirschner & Štěpánek View in CoL , sp. nov.
Type:—[ RUSSIA] Sibiria merid., urbs Bratsk, ad ripam sinistram lacus structilis “Bratskoe More”, ca. 10 km situ a vallo, ad marg. partis centralis urbis Bratsk, haud procul a deversorio “Bratsk”, 27–28 Oct 1985, J. Kirschner & J. Štěpánek, cultivated as JŠ 2703 ( PRA, no. det. 35986, holotype) .
Etymology:—Recoiling, remote from.
Diagnosis:—Species ex affinitate T. kljutschevskoani sed differt foliis forma complicata , lobis lateralibus acutis vel acuminatis, saepissime sparse lobulatis, lobo terminali tripartito vel depresse rhomboidali mucronato, phyllariis exterioribus pallidioribus, inconspicue marginatis; plantae nostrae etiam acheniis brevibus pyramide anguste cylindrica notabiles.
Plants not tall but of robust appearance, usually 9–14 cm tall. Petiole with purplish mid-vein or ± green, broadly to narrowly winged, initially arachnoid, later glabrescent, plant base without tunic. Leaves deep green, most often with a slightly purplish mid-vein, sparsely arachnoid, ± narrowly oblong in outline, usually 8–10 × 2—2.5 cm, some leaves often undivided, only shallowly dentate, most leaves pinnatifid to pinnatisect, terminal segment short, usually tripartite or mucronate with broadly deltoid basal lobules, or flat deltoid-triangular, margins usually straight and entire; lateral segments in 4–6 pairs, deltoid to deltoid-triangular, most often patent, sometimes subrecurved, typically distinctly acute or acuminate, distal margin subconvex, ± sigmoid or less often ± straight or subconcave, entire in distal segments, denticulate in proximal ones, distal margin sometimes with a distinct, narrow sub-basal lobule, proximalmargin almost straight, usually entire; interlobes very short, entire or with a few little teeth. Scapes usually growing from outside the leaf rosette, brownish green or suffused purplish, arachnoid, ± equalling leaves. Capitulum yellow, ca. 3–3.5 cm wide. Involucre deep olivaceous-green, ca. 8–10 mm wide and rounded at base. Outer phyllaries (10) 11–14 (16), ± appressed or loosely appressed, later to erect, not imbricate, usually narrowly lanceolate, seldom linear-lanceolate, ca. (6.0–) 6.5–8.5 (–9.5) × 2.0–2.8 (–3.2) mm, surface olivaceous-green to dark olivaceous-green, distally and marginally often suffused purplish, border not distinct, narrow, if visible then membranous, 0.2–0.3 mm wide, margins often remotely denticulate, ± not ciliate or very sparsely so, apex darker, almost flat in early capitula, corniculate or with horns in later ones. Outer ligules flat, narrow, or ± canaliculate, striped grey or slightly greenish grey outside, teeth dark grey (viewed from outside), inner ligule teeth dirty yellow or grey-yellow. Stigmas grey-yellow or greenish grey-yellow. Pollen present, pollen grains irregular in size. Achenes light greyish stramineous-brown, (3.3–) 3.5–3.8 × 0.8 (–1.0) mm, body subdensely, conspicuously covered with robust bi- and tricuspidate suberect squamules and (mainly on ridges) also curved spinules in upper 1/3–1/2, body subgradually to gradually narrowing into a (sub)cylindrical cone 0.5–0.7 × 0.25 mm; beak thin, (8.5–) 9.5–10.0 mm long, pappus white, ca. 5.5–6 mm long. – Agamospermous. – Fig. 3A View FIGURE 3 , 76 View FIGURE 76 , 77 View FIGURE 77 .
Diagnostic notes:—Among species with relatively narrow outer phyllaries, T. abhorrens is distinct in having leaves with ± broadly winged petioles and often acuminate, usually deltoid-triangular lateral segments with lobules at their distal base, and relatively short achenes with an almost cylindrical, thin cone. A superficially similar species, T. neoboreale , differs from T. abhorrens in its purely yellow stigmas, ovate outer phyllaries and a long, thicker cone.
Distribution:— Taraxacum abhorrens was collected at several localities along upper Angara River (Bratsk), and Baikal Lake near the origin of Angara River.
Specimens examined:—[ RUSSIA] S. Siberia, town of Bratsk, west shore of the “Bratskoe More” reservoir, about 10 km from the dam, not far from the “Bratsk” hotel, 27–28 Oct 1985, J. Kirschner & J. Štěpánek , cultivated as JŠ 2703 ( PRA, no. det. 36759). – Ibidem, 28 Oct 1985 , cultivated as JŠ 2704 ( PRA, no. det. 36768). – Bratsk , west shore of the “Bratskoe More” reservoir, about 2 km from the dam, 28 Oct 1985 , J. Kirschner & J. Štěpánek , cultivated as JŠ 2697 ( PRA, no. det. 36759). – [ RUSSIA] S. Siberia, Irkutsk region, Baikal Lake , in the vicinity of Listvyanka, and the “Pik Cherskogo” hill, 26 Oct 1985 , J. Kirschner & J. Štěpánek , cultivated as JŠ 2705 ( PRA, no. det. 36757). – Less certain identification:—[ RUSSIA] S. Siberia, Irkutsk region, Baikal Lake , in the vicinity of Listvyanka, near the origin of Angara R., 26 Oct 1985 , J. Kirschner & J. Štěpánek , cult. as JŠ 2708 ( PRA, no. det. 38432) .
| J |
University of the Witwatersrand |
| PRA |
Institute of Botany, Academy of Sciences |
| S |
Department of Botany, Swedish Museum of Natural History |
| R |
Departamento de Geologia, Universidad de Chile |
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