Centaurea sect. Acrocentron

Bona, Mehmet, 2015, Centaurea goksivriensis (Asteraceae), a new species from Turkey, Phytotaxa 203 (1), pp. 63-68 : 66

Key for the species of Centaurea sect. Acrocentron in Turkey

1. Appendage border with minute teeth ....................................................................................................................... C. vermiculigera

– Appendage border distinctly ciliate or spinulose...............................................................................................................................2

2. Appendage ending with in a conspicuous spine at least 6 mm long..................................................................................................3

– Appendage ending with a short mucro or spinule shorter than 6 mm long........................................................................................4

3. Flowers yellow...................................................................................................................................................................................5

– Flowers purple, pink or whitish........................................................................................................................................................10

4. Flowers yellow ............................................................................................................................................................................... 22

– Flowers purple or pink .................................................................................................................................................................... 24

5. Appendage large, totally (or nearly) concealing basal part of phyllary ........................................................................................... 6

– Appendage smaller ........................................................................................................................................................................... 7

6. Appendage irregularly lacerate (outer sometimes more regularly ciliate) ................................................................. C. lactucifolia

– Appendage regularly ciliate .................................................................................................................................... C. pseudoreflexa

7. Stem longer than 10 cm ................................................................................................................................................ C. salonitana

– Stem very short, shorter than 10 cm ................................................................................................................................................. 8

8. Terminal spine of appendage short, 5–10 mm long ..................................................................................................... C. pestalozzae

– Terminal spine longer ....................................................................................................................................................................... 9

9. Pappus 7–9 mm long ..................................................................................................................................................... C. acicularis

– Pappus absent .............................................................................................................................................................. C. chrysantha

10. Appendage large, totally or nearly totally concealing basal part of phyllary ................................................................................. 11

– Appendage smaller ......................................................................................................................................................................... 14

11. Stem and leaves hirsute .......................................................................................................................................... C. pseudoreflexa

– Stem and leaves arachnoid to floccose-tomentose, not hirsute ...................................................................................................... 12

12. Appendage broader than basal part of phyllary ..................................................................................................................... C. lydia

– Appendage not broader than basal part of phyllary ........................................................................................................................ 13

13. Perennial, flowers pink-purple or whitish ......................................................................................................................... C. urvillei

– Biennial, flowers blackish-purple ............................................................................................................................. C. goksivriensis

14. Flowers pink-purple or whitish ………………………………….……………… ........................................................…………. 15

– Flowers blackish-purple ……………………………..……...………..…… ........................................................………. C. antioch

15. Plant with very short stem, simple or branched from near base ..................................................................................................... 16

– Plant with elongate stem, usually branched above ......................................................................................................................... 17

16. Leaves arachnoid or thinly tomentose ............................................................................................................................... C. urvillei

– Leaves nearly glabrous (very short bristles at margin and along nerves) .................................................................... C. raphanina

17. Leaves hirsute, arachnoid or tomentose ......................................................................................................................................... 18

– Leaves nearly glabrous ................................................................................................................................................................... 20

18. Leaves lyrate; receptacular bristles 15–20 mm long ......................................................................................................... C. urvillei

– Leaves pinnatisect; receptacular bristles 7–13 mm long ................................................................................................................ 19

19. Terminal spine of appendage 10–30 mm long, achenes 6–10 mm long, pappus 7–10 mm long ............................. C. carduiformis

– Terminal spine of appendage up to 9 mm long, achenes 5–5.5 mm long, pappus 5–7 mm long .............................. C. elazigenesis

20. Leaves lyrate ...................................................................................................................................................................... C. persica

– Leaves pinnatisect .......................................................................................................................................................................... 21

21. Appendage (incl. terminal spine) 15–20 mm long .............................................................................................................. C. davisii

– Appendages shorter ................................................................................................................................................... C. scopulorum

22. Stem very short (less than 5 cm long) ......................................................................................................................... C. pestalozzae

– Stem longer (over 5 cm long) ......................................................................................................................................................... 23

23. Stem decumbent; segments of leaves linear-lanceolate ....................................................................................................... C. athoa

– Stem erect; segments of leaves broadly lanceolate ...................................................................................................... C. salonitana

24. Flowers blackish-purple ................................................................................................................................................................. 25

– Flowers pink-purple ........................................................................................................................................................................ 26

25. Terminal spinule of appendage 1–3 mm long ............................................................................................................ C. nerimaniae

– Terminal spinule of appendage 2.5–5 mm long ............................................................................................................ C. antiochia

26. Leaves subglabrous ........................................................................................................................................................... C. persica

– Leaves hispid or thinly tomentose ....................................................................................................................... C. pseudoscabiosa