Taraxacum sect. Dioszegia

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Taraxacum sect. Dioszegia

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Description

"Rosulate hemicryptophytes. Flowers and leaves develop simultaneously.Main flowering season: summer to early autumn. Main habitat: secondary dry, semi-steppe sites or xeric grasslands. Plants medium-sized to robust, plant base densely brownish hairy. Leaves subcoriaceous, usually densely hairy, at least beneath, swollen at hair base (often forming low protuberances or ridges), rarely ± flat, shallowly to deeply lobed, lobation pattern usually uncomplicated, lobes usually subpatent to recurved, leaves usually flat, midrib without striatulate pattern, leaf blade unspotted, petioles winged or broadly winged. Scapes erect during flowering, unbranched, growing from the centre of leaf rosette, densely aranose. Involucre with ± rounded base, usually of medium width. Flowers yellow, florets usually very numerous, ligules flat to canaliculate. Interior involucral phyllaries usually callose to corniculate at the apex. Exterior bracts 15–46, relatively regularly arranged, usually imbricate, ± appressed at base, often arcuate to arcuate-recurved at the apex, narrowly linearlanceolate, usually 5–8 mm long, pale greenish, often suffused red or pinkish, usually faintly bordered or with narrow paler or reddish margins, ciliate or sparsely ciliate to glabrous. Pollen always present, stigma pure yellow. Receptacle glabrous. Achenes subturbinate, usually 4.5–7 mm long, usually 0.8–1.1 mm thick, very gradually narrowing into the cone, achene body usually pale greyish straw brown, sparsely spinulose above, cone subcylindrical to cylindrical (length difficult to measure because of the indistinct transition between achene body and cone), usually 0.8–1.5 mm long. Rostrum thin, usually 6.0–8.0 (–12) mm long, pappus usually 6.5–8.5 mm long, whitish-yellowish to brownish-pinkish, not deciduous. Reproduction: sexual (diploid)."A

Image sources

Handel-Mazzetti 1907: t. 1 (details)B

Systematics

"Characteristic features include linear-lanceolate, imbricate (and apically arcuate) outer bracts, large achenes very gradually narrowing into the cone, subcoriaceous leaves with hairs often growing on small ridges on the leaf surface, and summer or late summer flowering". "Typically occurs in areas of dry, semisteppe to steppe, often naturally disturbed places"A

Distribution

Africa: Cape Provinces (Eastern Cape Provinceintroduced); Morocconative: doubtfully native Asia-Temperate: Afghanistannative; Irannative; Kirgizistannative; Lebanon-Syria (Lebanonnative, Syrianative); North Caucasusnative; Transcaucasus (Abkhaziyanative, Adzhariyanative, Armenianative, Azerbaijannative, Georgianative); Turkeynative Europe: Albanianative; Austrianative (Austrianative); Bulgarianative; Central European Russianative; Czechoslovakianative (Czech Republicnative, Slovakianative); East European Russianative; France (Francenative); Greecenative; Hungarynative; Krymnative; Polandnative: reported in error; Romanianative; South European Russianative; SpainnativeC (Spainnative); Turkey-in-Europenative; Ukraine (Moldovanative, Ukrainenative); Yugoslavia (Croatianative, Macedonianative, Serbianative, Sloveniaintroduced)

Credits

Kalheber H. 2010: Image sources (1 added).

Bibliography

A. Zeisek V. & al., Microsatellite variation, sexual reproduction and taxonomic revision of Taraxacum sect. Dioszegia in Preslia 87. 2015: 74
B. Handel-Mazzetti, H. von, Monographie der Gattung Taraxacum. 1907 (as Taraxacum serotinum aggr.)
C. Tutin, T. G., Heywood, V. H., Burges, N. A., Valentine, D. H., Walters, S. M. & Webb, D. A., Flora europaea 4 [Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A.]. 1976 (as Taraxacum serotinum aggr.)