Scorzonera albicaulis clade

Zaika, Maxim A., Kilian, Norbert, Jones, Katy, Krinitsina, Anastasiya A., Nilova, Maya V., Speranskaya, Anna S. & Sukhorukov, Alexander P., 2020, Scorzonera sensu lato (Asteraceae, Cichorieae) - taxonomic reassessment in the light of new molecular phylogenetic and carpological analyses, PhytoKeys 137, pp. 1-85: 1

publication ID

http://dx.doi.org/10.3897/phytokeys.137.46544

persistent identifier

http://treatment.plazi.org/id/850D3E8E-61F8-5682-AD30-BA07D25B7EBE

treatment provided by

PhytoKeys by Pensoft

scientific name

Scorzonera albicaulis clade
status

 

Scorzonera albicaulis clade  

= Achyroseris   Sch.Bip., Nov. Actorum Acad. Caes. Leop.-Carol. Nat. Cur. 21: 165. 1845. Type: Achyroseris macrosperma   (Turcz. ex DC.) Sch.Bip. (= S. albicaulis   Bunge). Note: Schultz (1845) based his segregation of Achyroseris   from Scorzonera   on the "paleate receptacle" in A. macrosperma   . This is, however, clearly erroneous, because a paleate (bracteate) receptacle is not present in any member of the Scorzonerinae   ; at most, the receptacle can be slightly hairy in some members of the phylogenetically distant Gelasia   .

= Scorzonera sect. Piptopogon   C.A.Mey., Bull. Soc. Imp. Naturalistes Moscou 21(3): 97. 1848.

Scorzonera subg. Piptopogon   (C.A.Mey.) C. Díaz & Blanca, Anales Jard. Bot. Madrid 43: 330. 1987. Type: Scorzonera macrosperma   Turcz. ex DC. (= S. albicaulis   Bunge)

= Scorzonera sect. Turkestanicae   Lipsch. in Bobrov & Tzvelev, Fl. URSS 29: 720. 1964. Type: Scorzonera turkestanica   Franch.

Diagnostic features.

Perennial herbs and subshrubs; pollen with 24 lacunae; achenes beaked; pappus dirty yellow, caducous.

Description.

Habit, life form, subterranean parts: perennial herbs and subshrubs with a taproot and often with caudex.

Leaves: rosulate and cauline, numerous, usually sessile (rosulate leaves petiolate in S. franchetii   ), semi-amplexicaule, linear to narrowly oblong, more often lanceolate, entire or crisp, glabrous or slightly pubescent.

Stem, synflorescence: stem solitary or several, usually leafy but bracteate in S. acanthoclada   and S. racemosa   , capitula terminal and solitary or numerous, in spiciform or corymbiform synflorescence.

Pollen: echinolophate, tricolporate and each colpus divided into 2 lacunae; with 24 (6 abporal, 6 equatorial, 6 interporal, 6 polar) lacunae ( Poddubnaya-Arnoldi et al. 1934; Nazarova 1997).

Capitula: pubescent and often glabrescent, phyllaries in several series, outer phyllaries 1/2-1/3 as long as inner ones, triangular-ovate, the inner phyllaries triangular to lanceolate, receptacle glabrous, capitula with 4-12 florets, yellow, pink or orange ( S. transiliensis   ), 1.5-2 times exceeding the involucre.

Achenes: 7-45 mm, straight, without carpopodium, with more or less expressed beak, 10- or rarely 5-ribbed, papillate; achene wall with parenchyma well-expressed and represented by collenchyma-like cells, then present only as subepidermal continuous layers or sometimes parenchyma absent or discontinuous in the rib areas, insular in principal ribs below sclerenchyma and in secondary ribs above sclerenchyma or absent, air cavities absent, sclerenchyma present as layers with a gap in the principal ribs or continuous sclerenchymatous layers, its fibres orientated parallel to the fruit axis, tannins absent.

Pappus: 6-28 mm, yellowish, bristles plumose below and scabrid in upper part.

Chromosome number.

x = 7, diploids.

Species.

(1) Scorzonera acanthoclada   Franch.

(2) Scorzonera albicaulis   Bunge

(3) Scorzonera baldschuanica   Lipsch.

(4) Scorzonera bracteosa   C.Winkl.

(5) Scorzonera crassicaulis   Rech.f.

(6) Scorzonera franchetii   Lipsch.

(7) Scorzonera graminifolia   L.

(8) Scorzonera petrovii   Lipsch.

(9) Scorzonera racemosa   Franch.

(10) Scorzonera tragopogonoides   Regel & Schmalh.

(11) Scorzonera transiliensis   Popov

(12) Scorzonera turkestanica   Franch.

(13) Scorzonera virgata   DC.

Distribution area.

Africa: MA. Asia-Temperate: AF; RU (Asian part); CN; IR; KG; KP; KR; KZ; MN; TM; TJ; UZ. Asia-Tropical: IN; PK. Europe: ES; PT.

Scorzonera alaica   Lipsch. may also belong to this clade based on morphological features.