Geropogon

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Taxonavigation

Ordo: Asterales
Familia: Asteraceae

Name

Geropogon L., Sp. Pl., ed.2, 2: 1109. 1763. – Wikispecies link – Pensoft Profile

Type species

Geropogon glaber L. (≡ G. hybridus (L.) Sch.Bip.)

Diagnostic features

Involucre with phyllaries in a single series; pappus of marginal achenes of five scabrid rays, pappus of inner achenes with plumose bristles.

Description

Habit, life form, subterranean parts: annual, ephemere.
Leaves: rosulate and cauline, graminoid (sessile, subamplexicaule, with prominent midrib), linear or lanceolate, margin entire.
Stem, synflorescence: stem solitary or branched, always leafy, glabrous; peduncle slightly inflated.
Capitula: involucre glabrous, cylindrical, phyllaries 7–8, linear-lanceolate, in a single series, equal in size, to ~30 mm; receptacle flat, marginally hairy; florets 10–20, much exceeded by the involucre, violet or purple (Fig. 15G).
Pollen: echinolophate, tricolporate and each colpus divided into 2 lacunae, with 24 (6 abporal, 6 equatorial, 6 interporal, 6 polar) lacunae (Blackmore 1982).
Achenes: 32–50 mm, cylindrical, without carpopodium, with a long beak exceeding the length of the achene body, without distinct ribs, surface usually papillate and with stout conglomerations; achene wall with parenchyma of thick-walled cells, air cavities present, small, sclerenchyma continuous, forming a sheath, cells orientated parallel to the achene axis, tannins present.
Pappus: with 5 glabrous awns 3–12 mm in outer achenes and plumose with dirty white bristles in inner achenes.

Chromosome number

x = 6.

Species

(1) Geropogon hybridus (L.) Sch.Bip.

Distribution area

N Africa: EG; DZ; LY; MA; TN. Europe: AL; BG; CY; ES; FR; GR; HR; IT; MD; MT; PT; RU; UA. Asia-Temperate: AM; AZ; IQ; IL; IR; JO; LB; SY; TR.
Rare alien in DE.

Taxon Treatment

• Zaika, M; Kilian, N; Jones, K; Krinitsina, A; Nilova, M; Speranskaya, A; Sukhorukov, A; 2020: Scorzonera sensu lato (Asteraceae, Cichorieae) – taxonomic reassessment in the light of new molecular phylogenetic and carpological analyses PhytoKeys, 137: 1-85. doi

Images

Figure 15. Images of living plants. A, B – Tourneuxia variifolia (Morocco, near Mrhimina). Photographs by A. Garcin (www.teline.fr) C – Gelasia villosa (cult. in BG Berlin, 13 Jun 2010). Photograph by N. Kilian D, E, F – Gelasia rigida (Jordan, Nakeb, 1250 m alt., 8 May 2019). Photograph by O. Fragman-Sapir. D general view E capitula in flowering F capitula in fruiting, a part of achenes had fallen off GGeropogon hybridus (Greece, Lefkas, 15 May 2016). Photograph by E. Willing HKoelpinia linearis (Qatar, Khashem Al Nekhsh area, 18 Mar 2016). Photograph by A. Sergeev.