Hieracium tenuiflorum Arv.-Touv. (Asteraceae)

Astuti, Giovanni, Bartolucci, Fabrizio, Conti, Fabio, Cera, Beatrice, Giaco, Antonio, Orsenigo, Simone, Sandroni, Luca & Peruzzi, Lorenzo, 2021, Chromosome numbers for the Italian flora: 12, Italian Botanist 12, pp. 123-131 : 123

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Hieracium tenuiflorum Arv.-Touv. (Asteraceae)


Hieracium tenuiflorum Arv.-Touv. (Asteraceae)

Chromosome number.

2 n = 27 (Fig. 5 View Figure 5 ).

Voucher specimen.

Italy. Liguria. Sanremo (Imperia), San Romolo (WGS84 43.84670N, 7.740880E), pendici del Monte Bignone, margine della strada verso Sanremo, 570 m, 28 May 2021, M. Ottonello, B. Cera, S. Orsenigo (PAV).


Squash preparations were made on root tips obtained from germinating seeds. Root tips were pre-treated with 0.4% colchicine for 3 hours and then fixed in Carnoy fixative solution for 1 hour. After hydrolysis in HCl 1N at 60 °C, the tips were stained in leuco-basic fuchsine for 7-8 minutes.


Hieracium tenuiflorum is a south European perennial species ( Gottschlich 2018). It was originally described for Monte Bignone, Monte Ceppo, and Monte Arpetta ( Bicknell 1896), in the Ligurian Alps. In Italy, this species is widespread throughout the Alps and pre-Alps, but it occurs also in the northern and central Apennines south up to Abruzzo ( Bartolucci et al. 2018).

The chromosome number 2 n = 3 x = 27, reported here for the first time, is consistent with observations made in other taxa belonging to H. sect. Hieracium , such as those of the H. murorum aggregate in Italy ( Selvi and Fiorini 1996; Geraci et al. 2007) and Europe ( Chrtek et al. 2009).

S. Orsenigo, B. Cera, A. Giacò