**2.2 Results and discussion**

406 Macro to Nano Spectroscopy

**Sample Voucher Date Sample Voucher Date**  BaCO1 1570 Apr-05 BmFO 1656 Feb-06 BaCO2 1607 Feb-06 BmMI 1657 Feb-06 BaCO3 1617 Mar-06 BphySF1 1888 Feb-07 BaCO4 1618 Mar-06 BphySF2 1939 Mar-08 BaCO5 1619 Mar-06 BpER 1594 Jan-06 BaCO6 1620 Mar-06 BpSF1 1887 Feb-07 BaCO7 1621 Mar-06 BpSF2 1938 Mar-08 BaCOR 1903 Mar-07 BsRN1 1906 Mar-07 BaER1 1927 Apr-07 BsRN2 1953 Nov-08 BaER2 1928 Aug-07 BtrBAa SI Burkartb Nov-1972 BaER3 1929 Apr-07 BtrCHUa SI Dacnikb Feb-1969 BaSF1 1930 Aug-07 BtrLPa 3262 Dec-1975 BaSF2 1916 Jan-07 BtrSL 1907 Mar-07 BaSF3 1917 Jan-07 BtBA1 1955 Aug-05 BcCO1 1543 Mar-05 BtBA2 1956 Mar-05 BcCO2 1623 Mar-06 BtBA3 1668 May-06 BcCO3 1624 Mar-06 BtCOR1 1539 Mar-05 BcME1 1590 Jan-06 BtCOR2 1553 Mar-05 BcME2 1591 Jan-06 BtCOR3 1574 Jul-05 BcME3 1909 Jan-07 BtCOR4 1954 Feb-06 BcME4 1910 Jan-07 BtER1 1535 Mar-05 BgMI1 1564 Oct-05 BtER2 1537 Mar-05 BgMI2 1566 Oct-05 BtER 3 1542 Dec-04 BgMI3 1655 Feb-06 BtER4 1583 Feb-06 BgMI4 1569 Mar-05 BtER5 1645 Mar-06 BgMI5 1654 Feb-06 BtER6 1926 Apr-07

Table 1. Collection data of analysed samples of *Baccharis* species. The abbreviation mean: species: Ba, *B. articulata*; Bc, *B. crispa*; Bg, *B. gaudichaudiana*; Bm, *B. microcephala*; Bp, *B. penningtonii*; Bphy, *B. phyteumoides*; Bs, *B. sagittalis*; Btr, *B. triangularis*; Bt, *B. trimera*;

provinces: BA, Buenos Aires; CHU, Chubut; CO, Córdoba; COR, Corrientes; ER, Entre Ríos; FO, Formosa; LP, La Pampa; MI, Misiones; RN, Río Negro; SF, Santa Fe; SL, San Luis. Numbers indicate when there is more than one population of the same species. **a** Material extracted from Herbarium; b Names of collectors, numbers not provided by the Herbarium.

Principal components analysis (PCA) was applied to the population study. The analysis was performed using the NTSYS-pc 2.11w (Numerical Taxonomy and Multivariate Analysis

Basic data matrix was prepared considering 700 absorbance values (quantitative variable) of

BmCOR 1572 Oct-05

**2.1.1 Statistical analysis** 

System) designed by Rohlf (1998).

each analysed sample (53 extracts in total).
