Olive Olea europaea (Oleaceae)
| Flowers small | |
| 1A-Herb | |
| 2A-Leaves in whorls | Polycarpon tetraphyllum (1) |
| 2B-Leaves fleshy | Crassula vaillantii |
| 2C-Leaves different | |
| 3A-Leaves acute | Asterolinon linum-stellatum |
| 3B-Leaves rounded | |
| 4A-Plants woody below (rocky coastlines) | Polycarpon polycarpoides * |
| 4B-Not woody below (on sand + beaches) | Polycarpon alsinifolium |
| 1B-Woody climber | Boussingaultia cordifolia |
| 1C-Shrub | Phillyrea media |
| 1D-Tree | Olea europaea (p.18) |
| 2-4 petals | |
| 1A-Leaves linear | Crassula vaillantii |
| 1B-Leaves egg-shaped | Radiola linoides |
| 1C-Leaves lanceolate | |
| 2A-Tree | Olea europaea (p. 18) |
| 2B-Shrub | |
| 3A-Flowers 2-3 mm/inflorescence axillary | Phillyrea media |
| 3B-Flowers 4-6 mm/inflorescence terminal | Ligustrum ovalifolium |
Asterolinon linum-stellatum Star Flax (Primulaceae) Annual/stem 4-angled/leaves lanceolate/flowers 0-2 mm/calcareous fields/Mar-June
Boussingaultia cordifolia Madeira-vine (Basellaceae) Woody climber/leaves cordate/ inflorescence 5-20 cm/flowers 2 mm/5 stamens/fields-marshland-road sides/Sep-Oct Crassula vaillantii Narrow-leaved Mossy Stonecrop (Crassulaceae) Annual/leaves fleshy/ leaf stalk longer than the leaves/flowers 1-2 mm/marshland/Menorca/Mar-June
Ligustrum ovalifolium (Oleaceae) Shrub/leaves oval/flowers 4-6 mm/inflorescence terminal/June-July
Olea europaea Olive (Oleaceae) Tree/leaves lanceolate/flowers small and aromatic/oak forests-rock crevices-marshland-garigues-pine forests-olive tree plantations/May-June
Phillyrea media (Oleaceae) Shrub/flowers 2-3 mm/inflorescence axillary/tree heathermacchia-oak forests-rock crevices/Mar-June
Polycarpon alsinifolium Four-leaved Allseed (Caryophyllaceae) Procumbent annual/ leaves ovate or lanceolate/flowers 2-3 mm/petals divided/1-5 stamens/sandy soilsbeaches/Mar-July
Polycarpon polycarpoides* (Caryophyllaceae) Woody below/petals 1-2 mm/5 stamens/ rocky coastlines/Apr-Aug
Polycarpon tetraphyllum Four-leaved Allseed (Caryophyllaceae) Annual/leaves obovate and in whorls of 4/flowers 2-3 mm/petals divided/1-5 stamens/fields-walls-rocky soilsroad sides/Mar-July
Radiola linoides Allseed (Linaceae) Annual to 10 cm/leaves ovate/flowers 1-2 mm/ Menorca/May-Sep
| 5 petals | |
| 1A-Leaves cordate | |
| 2A-Flowers 2 mm | Boussingaultia cordifolia |
| 2B-Flowers > 5 mm | |
| 3A-Leaves egg-shaped | Cynanchum acutum |
| 3B-Leaves narrow | Vincetoxicum hirundinaria |
| 1B-Leaves not cordate | |
| 2A-Sepals of the flower fused | |
| 3A-Petals hardly bigger than the calyx | |
| 4A-Flowers sessile | Silene disticha |
| 4B-Flowers with stalks | |
| 5A-Flowers solitary or in pairs | Silene sedoides |
| 5B-Flowers in groups of 5-15 | Silene nocturna |
| 3B-Petals >> sepals | |
| 4A-Petals deeply divided | |
| 5A-Plants without hairs | Silene vulgaris (4) |
| 5B-Plants with hairs | |
| 6A-Herb | Silene nicaeensis |
| 6B-Plants woody below | Silene mollissima* |
| 4B-Petals not deeply divided | |
| 5A-Plants without hairs | Saponaria officinalis (3) |
| 5B-Plants with hairs | |
| 6A-Flowers stalked/calyx 4-7 mm | Gypsophila pilosa |
| 6B-Flowers sessile | |
| 7A-Calyx 7-10 mm | Silene gallica |
| 7B-Calyx 11-14 mm | Silene tridentata |
| 2B-Sepals of the flower separated | |
| 3A-Petals of the flower fused | |
| 4A-Stem round | Centaurium pulchellum |
| 4B-Stem 4-angled | |
| 5A-Flowers up to 2 mm | Asterolinon linum-stellatum |
| 5B-Flowers 4-7 mm | Anagallis arvensis (9) |
| 3B-Petals of the flower separated | |
| 4A-Leaves with stalks | Stellaria pallida |
| 4B-Leaves sessile | |
| 5A-Petals of the flower divided | |
| 6A-Flowers with 3 styles | Stellaria media |
| 6B-Flowers with 5 styles | |
| 7A-Flowers with 5 stamens | |
| 8A-Petals < sepals | Cerastium semidecandrum |
| 8B-Petals > sepals | Cerastium pumilum |
| 7B-Flowers with 10 stamens | |
| 8A-Petals < sepals | Cerastium brachypetalum |
| 8B-Petals > sepals | Cerastium glomeratum |
| 5B-Petals not divided | |
| 6A-Flowers with 1-4(5) stamens | |
| 7A-Flowers in umbels | Polycarpon alsinifolium |
| 7B-Flowers not in umbels | Polycarpon tetraphyllum (1) |
| 6B-Flowers with 5 stamens | |
| 7A-Plants without hairs | |
| 8A-Petals to 2 mm | Polycarpon polycarpoides |
| 8B-Flowers 12-20 mm | Lonicera pyrenaica* |
| 7B-Plants with hairs | |
| 8A-Flowers in axillary clusters | Paronychia argentea |
| 8B-Flowers in terminal clusters | Paronychia capitata |
| 8C-Flowers terminal/12-14 mm | Gomphocarpus fruticosus |
| 6C-Flowers with 6 stamens | Frankenia pulverulenta |
| 6D-Flowers with 10 stamens | |
| 7A-Plants without hairs | |
| 8A-Leaves
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