Table 1. Location and characteristics of study species and sites.
| Species | Species code | Species typea | Nb | Sampling sitesc | UTM | Altitude (m a.s.l.) | Date of sampling | Subst.d |
| Centaurea hyssopifolia Vahl. | Ch | NE | 4 | Chinchón (M) | VK6247 | 640 | 15-Mar-10 | G |
| Gypsophila struthium L. subsp. hispanica (Wilk.) G. López | Gh | G | 5 | Villamayor (Z) | XM8820 | 300 | 19-Feb-10 | G |
| Helianthemum marifolium (L.) Mill. subsp. conquense Borja and Rivas Goday | Hco | NE | 7 | Tendilla (Cu) | WK4214 | 780 | 3-Mar-03 | G |
| Helianthemum squamatum (L.) Pers. | Hsq | G | 5 | Villamayor (Z) | XM8718 | 290 | 21-Jan-03 | G |
| Herniaria fruticosa L. | Hf | G | C | Villamayor (Z) | XM8820 | 300 | 20-Jan-03 | G |
| 19-Feb-10 | ||||||||
| XM8718 | 290 | 21-Jan-03 | G | |||||
| Lepidium subulatum L. | Lsb | G | 5 | Villamayor (Z) | XM8820 | 320 | 13-Jan-03 | G |
| 19-Feb-10 | ||||||||
| Linum suffruticosum L. | Lsf | GV | 5 | Villamayor (Z) | XM8820 | 320 | 7-Jan-03 | G |
| Ononis tridentata L. | Ot | G | 5 | Villamayor (Z) | XM8820 | 300 | 20-Jan-03 | G |
| 19-Feb-10 | ||||||||
| Rosmarinus officinalis L. | Ro | GV | 5 | Peñaflor (Z) | XM8626 | 300 | 24-Jan-03 | G |
| Salvia lavandulifolia Vahl. | Sl | GV | 5 | Villamayor (Z) | XM8820 | 320 | 21-Jan-03 | G |
| Teucrium polium L. subsp. capitatum (L.) Arcangelli | Tc | GV | 5 | Chinchón (M) | VK6247 | 640 | 6-Feb-03 | G |
| Teucrium pumilum L. | Tp | NE | 6 | Chinchón (M) | VK6247 | 640 | 6-Feb-03 | G |
| Thymelaea tinctoria (Pourr.) Endl. subsp. tinctoria | Villamayor (Z) | 19-Feb-10 | ||||||
| Thymus lacaitae Pau | Tl | NE | 5 | Alcalá de Henares (M) | VK8282 | 710 | 28-Jan-03 | G |
a
NE = Narrow endemism, G = gypsophile, GV = gypsovag.
b
N = number of sampled individuals, C = composite sample.
c
M = Madrid (Central Spain, Middle Tajo Basin), Cu = Cuenca (Central Spain, Middle Tajo Basin), Z = Zaragoza (NE Spain, Middle Ebro Basin).