Crocus vernus group: chiave di determinazione (Peruzzi)

[Franco Giordana]

https://www.actaplantarum.org/forum/vie ... 11#p401811

Come già scritto diverse volte su post simili,

le piante dell'Appennino centro-meridionale sono Crocus neapolitanus (Ker Gawl.) Loisel., mentre quelle dell'Arco Alpino (ex C. albiflorus Kit.) sono il vero C. vernus (L.) Hill

Ho un articolo in stampa su Plant Systematics and Evolution che fa il punto della situazione sull'intera serie Verni.

Ne anticipo la chiave per l'identificazione:

Identification key to Crocus series Verni

Autumn flowering, tube (23)78-157(180) mm long; 2n = 28 C. longiflorus
Late winter or spring flowering, tube (3.6)44-89.5(145.6) mm long; 2n = 8-23 1
1. Throat yellow 2
- 2. Corm (9.4)10.8-18.7(25) mm wide, with fibers (0.15)0.18-0.35(0.42) mm; stigma sublobes incised for 0.1-0.2(0.35) mm; C. Italy; 2n = 8 C. etruscus
- 2. Corm (6.9)8.6-13.9(15.7) mm wide, with fibers (0.04)0.08-0.12(0.17) mm; stigma sublobes incised for (0.18)0.22-0.78(1.04) mm; Serbia; 2n = 14 C. kosaninii
1. Throat never yellow 3
- - 3. Stigma always deeply inserted between the stamens (distance from the top of anthers and stigma, not less than 2, up to 20 mm) with style not visible 4
- - - 4. Populations predominantly blue-violet; perigone segments (19)20-25 mm long; Sicily; 2n = 8 C. siculus
- - - 4. Populations predominantly white; perigone segments (20)22-33(36) mm long; high mountains of S. Europe; 2n = 8 C. vernus
- - 3. Stigma more or less equalling the stamens, or longer (rarely, up to 5 mm under the anthers in single individuals) with style always visible 5
- - - - 5. Apex of tepals with darker heart-shaped spot just below apex (in white flowers very pale, in blue-violet flowers - dark) [C.E. Europe; 2n = 10, 12, 18, 19, 20, 22, 23] C. heuffelianus
- - - - 5. Apex of tepals never as above 6
- - - - - 6. At least external tepals with three conspicuous dark stripes (Fig. 1F) [Elba Island; 2n = 8] C. ilvensis
- - - - - 6. Tepals without three conspicuous stripes (occasionally, a number of minor stripes) 7
- - - - - - 7. Tube gradually opening to the free portion of tepals, which are (18)25-45(54) mm long; stigma sublobes incised for (0.01)0.04-0.13(0.4) mm 8
- - - - - - - 8. Stigma sublobes incised for (0.05)0.07-0.18(0.4) mm; bulbs (corms) with fibers (0.11)0.12-0.16(0.18) mm wide [S. Europe; 2n = 16] C. neglectus
- - - - - - - 8. Stigma sublobes incised for (0.01)0.03-0.09(0.1) mm; bulbs (corms) with fibers (0.03)0.04-0.09(0.11) mm wide [C. Mediterranean; 2n = 8] C. neapolitanus
- - - - - - 7. Tube thin, abruptly opening to the free portion of tepals, which are (19)24.9-33(36) mm long; stigma sublobes incised for (0.39)0.56-1.34(1.82) mm [NW. Balkans; 2n = 16] C. tommasinianus