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Table I
The ecological and geographical parameters of the P. balfouriana populations sampled.
| Population | No. of samples | Coordinates | Altitude (m) | Landform feature | Annual rainfall | Annual average |
|---|---|---|---|---|---|---|
| (mm) | temperature (°C) | |||||
| JL | 27 | 29° 03′ N / 101° 25′ E | 3180 | Alpine and canyon | 892 | 8.8 |
| DF | 30 | 30° 28′ N / 101° 39′ E | 3650 | Plateau and mountain | 579 | 7.8 |
| XC | 31 | 28° 54′ N / 99° 48′ E | 3580 | Alpine and canyon | 462 | 10.7 |
| LH | 29 | 31° 32′ N / 100° 22′ E | 3500 | Plateau and mountain | 652 | 6.3 |
| YJ | 29 | 29° 59′ N / 100° 56′ E | 3430 | Alpine and valley | 706 | 10.9 |
| BY | 28 | 31° 20′ N / 99° 30′ E | 4010 | Alpine and valley | 599 | 7.7 |
| BT | 29 | 30° 00′ N / 99° 03′ E | 3500 | Alpine and valley | 474 | 12.6 |
| KD | 28 | 29° 27′ N / 101° 26′ E | 3410 | Alpine and canyon | 905 | 7.0 |
| XL | 29 | 30° 48′ N / 100° 30′ E | 4020 | Alpine and valley | 602 | 7.4 |
| LT | 21 | 30° 03′ N / 100° 28′ E | 4014 | Plateau and mountain | 726 | 3.0 |