Taraxacum atrans

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Taraxacum atrans

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Systematics

Kirschner & al. (2020: 182) state that the identity of the type of the name Taraxacum atrans is difficult to establish, due to missing achenes. The achene description in the protologue my refer to either unripe achenes or of achenes from plants not conspecific with the type material. The several sources of T. atrans like plants known are vegetatively very similar but deviate in achene features and it cannot be decided which represent the type material. Consequently Kirschner & al. (2020: 182) treat T. atrans in the wide sense of a species complex.A

Description

"Plants small, usually 4–6 (–10) cm tall. Petiole pale green, narrowly winged, sometimes unwinged, glabrous; plant base with a few brownich hairs, tunic not developed. Leaves dull green with a green mid-vein, linear oblanceolate to oblanceolate in outline, usually 4–6 (–9.5) × 1.0–1.4 cm, ± glabrous, someleaves often undivided, subentire or with short, remote, obtuse teeth, most leaves ± remotely pinnatilobed, with 2–3 pairs of remote, ± patent lateral lobules 1.5–3 (–4.5) mm long, lobules entire, leaf terminal segment not distinctly developed, to 2–2.5 cm long. Scapes ± brown-green, arachnoid throughout and/or densely so below capitulum, subequalling leaves. Capitulum yellow, 1.5–2 cm wide. Involucre blackish, ± not pruinose, ca. 8 mm wide and rounded to broadly rounded at base. Outer phyllaries 9–11, nicely imbricate, ovate to broadly so, usually 5.5–6.5 × 3–4 mm, with ± conspicuous or often almost invisible whitish membranous to membranous border ca. 0.2 mm wide, sometimes also with a broader paler border to ca. 0.5 mm wide, otherwise ± black, margins glabrous, entire, apex ± flat to callose; inner phylaries 11–14 mm long, dark green to blackish green, ± flat, sometimes some neighbouring phyllaries coalescing. Outer ligules ± flat, striped dark grey outside, with relatively distinct black teeth, inner ligule teeth grey. Stigmas grey-green, pollen absent or rarely very sparsely present, then pollen grains irregular in size. Achenes light greyish stramineous-brown to light greybrown, 5.0–5.3 × 0.9–1.0 mm, body sparsely spinulose in upper 1/4–1/5, spinules very short, erect-patent, otherwise smooth, gradually narrowing into a subcylindrical cone 1.0–1.1 mm long, 0.35 mm thick at base, 0.30 mm distally, beak not breaking off, thin, 5–5.5 × ca. 0.15 mm, pappus ± white, ca. 5.5 mm long. Agamosperm."

from Kirschner & al. (2020: 182), based on material from the Shyok area in Ladakh (Jammu & Kashmir) only [compare section Systematics]A

Distribution

Asia-Temperate: Kirgizistan nativeA,B; Mongolia doubtfully presentC; Tadzhikistan nativeD Asia-Tropical: Pakistan nativeA; West Himalaya (Jammu-Kashmir nativeA)

Bibliography

A. Kirschner J., Štěpánek J., Klimeš L. & al., The Taraxacum flora of Ladakh, with notes on the adjacent regions of the West Himalaya in Phytotaxa 457: 1-409. 2020
B. Lazkov G. A. & Sultanova B. A., Kadastr flory Kyrgyzstana: sosudistye rasteniya / Checklist of vascular plants of Kyrgyzstan. – Norrlinia 24. 2011
C. Gubanov I. A., Konspekt flory vnešnej Mongolii (sosudistye rastenija). 1996
D. Vainberg T. I. - Taraxacum in Rasulova M. R. (ed.), Flora Tadzhikskoĭ SSR 10. 1991