Scorzonera sensu lato (Asteraceae, Cichorieae) - taxonomic reassessment in the light of new molecular phylogenetic and carpological analyses Author Zaika, Maxim A. Author Kilian, Norbert Author Jones, Katy Author Krinitsina, Anastasiya A. Author Nilova, Maya V. Author Speranskaya, Anna S. Author Sukhorukov, Alexander P. text PhytoKeys 2020 137 1 85 http://dx.doi.org/10.3897/phytokeys.137.46544 journal article http://dx.doi.org/10.3897/phytokeys.137.46544 1314-2003-137-1 FB2C14EFA257564AA84CD47711BBC273 Pterachaenia (Benth.) Stewart, Punjab Forest Rec. 2, 1 [Cat. Pl. Rawalpindi Distr.]: 50. 1952. Scorzonera sect. Pterachaenia Benth. in Bentham & Hooker, Gen. Pl. 2: 532. 1873.Type: Pterachaenia stewartii (Hook.f.) R.R.Stewart Note. Usually Lipschitz (1939 : 31) is given as the place of publication for the generic name Pterachaenia . His statement "I think this section will also turn out to be a separate genus (gen. proprium Pterachaenia )" [translated from Russian] qualifies it, however, as a provisional genus name not formally accepted by its author. Diagnostic features. Flowering stems several or many, unbranched, leafless (scapes); phyllaries lanceolate, acute; florets yellow with red veins; achenes with 2-3 wings or without. Description. Habit, life form, subterranean parts: perennial with caudex or annual herbs, with taproot. Leaves: rosulate, graminoid, linear or lanceolate, glabrous or hairy, often broadened in upper half. Stem, synflorescence: stems leafless, unbranched (scapes) several to many, pubescent in lower part and glabrous in upper part, with terminal capitulum. Pollen: echinolophate, tricolporate and each colpus divided into 2 lacunae, with 9 (6 abporal and 3 equatorial: P. stewartii ) or 18 (6 abporal, 6 equatorial, 6 interporal: P. codringtonii ) lacunae ( Blackmore 1982 ). Capitula: involucre usually pubescent, phyllaries in two to several series, linear or lanceolate, acute, outer phyllaries 1/4-1/2 the length of the inner ones; receptacle glabrous, florets 12-22, yellow with red veins, equal in length to inner phyllaries. Achenes: 12-15 mm, straight, without carpopodium; with 2-3 elongated ribs forming wings denticulate in upper part ( Pterachaenia stewartii ) or without wings ( P. codringtonii ), papillate and with small emergences (spinulae) ( P. stewartii ) or with smooth surface ( P. codringtonii ), with five principal ribs, parenchyma of two types, with thick-walled cells and with thin-walled cells, discontinuous (located above sclerenchyma between the principal ribs and below sclerenchyma in the rib areas) or only insular above sclerenchyma, air cavities absent, sclerenchyma continuous, equal in thickness, fibres orientated parallel to the fruit axis, tannins absent. Pappus: 13-20 mm, fulvous, bristles plumose, apically scabrid. Chromosome number. x = 6 ( Pterachaenia stewartii ) and x = 7 ( P. codringtonii ), diploids. Distribution area. Asia-Temperate : AF; IR. Asia-Tropical : PK. Species. (1) Pterachaenia codringtonii (Rech.f.) Zaika, Sukhor. & N.Kilian, comb. nov. ≡ Scorzonera codringtonii Rech.f., Oesterr. Bot. Z. 97: 263. 1950. urn:lsid:ipni.org:names:77204061-1 (2) Pterachaenia stewartii (Hook.f.) R.R.Stewart in Punjab Forest Rec. 2, 1: 50. 1952.