Table 1.
Sampling locations in Iceland (Fig. 1), total number of plants studied (n) and number of diploid (2x = 28), triploid (3x = 42) and tetraploid (4x = 56) plants from each site
| Location | Label | Location (°N/°W) | Altitude (m)* | T (°C)† | n | Diploid | Triploid | Tetraploid |
|---|---|---|---|---|---|---|---|---|
| Brekkuskógur | A | 64·27/20·51 | 129 | 11·57 | 27 | 7 | 4 | 16 |
| Bifröst | B | 64·76/21·59 | 62 | 11·10 | 42 | 16 | 3 | 23 |
| Vagla-Hálsskógur | C | 65·72/17·89 | 131 | 10·59 | 33 | 12 | 0 | 21 |
| Ásbyrgi | D | 66·01/16·50 | 41 | 11·12 | 35 | 18 | 5 | 12 |
| Eidar | E | 65·32/14·36 | 49 | 10·64 | 35 | 14 | 6 | 15 |
| Jökulsá í Lóni | G | 64·43/14·90 | 36 | 9·95 | 39 | 16 | 3 | 20 |
| Skaftafell | H | 64·03/16·98 | 267 | 10·47 | 35 | 13 | 5 | 17 |
| Bæjarstadaskógur | S‡ | 64·05/17·04 | 125 | 10·47 | 15 | 0 | 0 | 15 |
| Reykjanes | I‡ | 63·89/21·72 | 20 | 11·09 | 30 | 0 | 0 | 30 |
| Kjálkafjördur | J | 65·62/22·94 | 14 | 10·63 | 34 | 13 | 4 | 17 |
| Fagrahlíd | K | 65·22/18·66 | 402 | 10·54 | 30 | 0 | 1 | 29 |
| Kaldalón | M | 66·10/22·39 | 36 | 9·94 | 35 | 15 | 7 | 13 |
| Blöndulón | O§ | 65·36/19·80 | 452 | 8·36 | 36 | 35 | 1 | 0 |
| Mývatn | R | 65·58/16·85 | 304 | 10·23 | 35 | 17 | 5 | 13 |
* Metres above sea level (average for woodland).
† Average temperature for July, from 1998 to 2005.
‡ Only B. pubescens was found in this area.
§ Only B. nana was in this area.