Elatine hydropiper Eight-stamened Waterwort (Elatinaceae) Aquatic plant/leaves elliptical/8 stamens/marshland/Menorca
Elatine macropoda (Elatinaceae) Annual/flowers stalked/4 sepals and petals/8 stamens/ marshland/May-July
Exaculum pusillum (Gentianaceae) Annual with lanceolate leaves/flowers 4-5 mm/stigma with 2 parts
Lythrum portula Water Purslane (Lythraceae) Annual/leaves obovate/flowers 1-2 mm/ Menorca
Valerianella eriocarpa Hairy-fruited Cornsalad (Valerianaceae) Annual/lower leaves spoon-shaped, upper leaves oblong/flowers 2-3 mm/3 stamens/leaves toothed at the base/waste land/Apr-May
Veronica anagallis-aquatica Blue Water Speedwell (Scrophulariaceae) Plant with hollow stem/leaves lanceolate/flowers in opposite inflorescences/flowers 5-10 mm/wet places/ Apr-Sep
| 5 petals (violet) | |
| 1A-Stem angled | |
| 2A-Plants without hairs | Anagallis tenella |
| 2B-Plants with hairs | Valerianella eriocarpa |
| 1B-Stem round | |
| 2A-Leaves with stalks | |
| 3A-Herb/flowers 25-35mm | Mirabilis jalapa |
| 3B-Woody at the base/flowers 6-8 mm | Vincetoxicum nigrum |
| 3C-Shrub/flowers 40-60 mm | |
| 4A-Leaves egg-shaped | Cistus creticus |
| 4B-Leaves lanceolate | Nerium oleander (7) |
| 2B-Leaves sessile | |
| 3A-Sepals of the flower fused | |
| 4A-Petal margin toothed | Dianthus rupicola* |
| 4B-Petal margin entire | |
| 5A-Sepals > petals | Agrostemma githago (p. 46) |
| 5B-Styles and stigma of the flower hairy | Silene cambessedesii* |
| 5C-Flowers different | |
| 6A-Flowers with 2 styles | |
| 7A-Stem without hairs | |
| 8A-Flowers 6-8 mm | Gypsophila pilosa |
| 8B-Flowers 8-16 mm | Vaccaria hispanica (p. 24) |
| 8C-Flowers > 16 mm | Saponaria officinalis (199) |
| 7B-Stem with hairs | |
| 8A-Leaf sheath < 2x as long as wide | Petrorhagia nanteuilii |
| 8B-Leaf sheath much longer | Petrorhagia dubia |
| 6B-Flowers with 3-5 styles | |
| 7A-Calyx of the flower < 13 mm | |
| 8A-Petals entire | |
| 9A-Calyx < 3 mm | Silene gallica |
| 9B-Calyx 11-14 mm | Silene tridentata |
| 8B-Petals lobed | |
| 9A-Calyx not narrowed | Silene rubella |
| 9B-Calyx opening contracted | Silene cerastoides |
| 8C-Petals deeply divided | |
| 9A-Flowers solitary | Silene colorata |
| 9B-Flowers in groups of 2-8 | Silene nicaeensis |
| 7B-Calyx of the flower > 13 mm | |
| 8A-Flowers in groups of 1-3 | |
| 9A-Stem with glandular hairs | Silene almolae |
| 9B-Stem without glandular hairs | Silene sericea |
| 8B-Flowers in groups of > 3 | |
| 9A-Plants without hairs | Silene muscipula |
| 9B-Plants (almost) hairless | Silene secundiflora |
| 9C-Plants with hairs | |
| 10A-Petals entire | Silene pseudatocion* |
| 10B-Petals of the flower divided | |
| 11A-Plants woody below | Silene hifacensis* |
| 11B-Plants not woody below | Silene bellidifolia |
| 3B-Sepals of the flower separated | |
| 4A-Petals of the flower fused | |
| 5A-Basal leaves in a rosette | |
| 6A-Flowers salmon-coloured | Centaurium bianoris * |
| 6B-Flowers violet | Centaurium erythraea (30) |
| 5B-Basal leaves not in a rosette | |
| 6A-Flowers 5-9 mm | Centaurium pulchellum |
| 6B-Flowers bigger | |
| 7A-Stems only branched above | Centaurium tenuiflorum |
| 7B-Stems branched from the middle | Centaurium spicatum |
| 4B-Petals of the flower separated | |
| 5A-Shrub | |
| 6A-Plants with hairs/flowers 40-60 mm | Cistus albidus (p. 30) |
| 6B-Plants without hairs/flowers small | Coriaria myrtifolia |
| 5B-Herb | |
| 6A-Leaves without stipules | |
| 7A-Flowers with 10 stamens | Rhodalsine geniculata |
| 7B-Flowers with 6 stamens | |
| 8A-Flowers terminal | Frankenia hirsuta |
| 8B-Flowers different | Frankenia laevis (6) |
| 7C-Flowers with 4-5 stamens | |
| 8A-Basal leaves not in a rosette | |
| 9A-Flowers 5-9 mm | Centaurium pulchellum |
| 9B-Flowers bigger | |
| 10A-Stems branched | Centaurium spicatum |
| 10B-Stems only branched above | Centaurium tenuiflorum |
| 8B-Basal leaves in a rosette | |
| 9A-Flowers salmon-coloured | Centaurium bianoris * |
| 9B-Flowers violet | Centaurium erythraea (30) |
| 6B-Leaves with stipules | |
| 7A-Petals > sepals | |
| 8A-Plants woody below | |
| 9A-Seeds winged | Spergularia media (18) |
| 9B-Seeds not winged | Spergularia fimbriata |
| 8B-Plants not woody below | Spergularia diandra |
| 6B-Petals < sepals | |
| 7A-Stipules forming a sheath | Spergularia marina |
| 7B-Stipules triangular | Spergularia bocconei |
| 7C-Stipules cordate | Spergularia heldreichii |
Agrostemma githago Corn Cockle (Caryophyllaceae) Grey hairy annual/leaves linearlanceolate/flowers 3-5 cm/5 styles/fields-road sides/May
Anagallis tenella Bog Pimpernel (Primulaceae) Hairless annual/stem 4-angled/leaves rounded/flowers 6-10 mm/marshland/Apr-Sep
Centaurium bianoris* (Gentiananceae) Annual/leaves sessile/flowers 11-18 mm/ calcareous fields/Apr-June
Centaurium erythraea Common Centaury (Gentianaceae) Annual/lower leaves obovate, stem leaves oblong to narrowly ovate/flowers 9-15 mm/fields-rocky coastlinesgarigues-pine forest-macchia-marshland/Apr-Aug
Centaurium pulchellum Lesser Centaury (Gentianaceae) Annual without basal leaf rosette/stem with multiple branches/leaves ovate-lanceolate/flowers 5-9 mm/fieldsrocky coastlines-beaches/Apr-May
Centaurium spicatum