Silene mollissima* (Caryophyllaceae) Hairy plant/petals divided/calyx 17-25 mm/rock crevices/May-June
Silene nicaeensis (Caryophyllaceae) Sticky, hairy annual/petals divided/calyx 10-13 mm/ May
Silene nocturna (Caryophyllaceae) Softly hairy annual/leaves with short stalks, spatulate or obovate to lanceolate/petals hardly protruding from calyx/petals divided/calyx 9-13 mm/flowers almost sessile/fields-road sides/Apr-June
Silene sedoides (Caryophyllaceae) Softly hairy annual/leaves succulent/flowers stalked/ flowers in groups of 1-2/calyx 6-8 mm/petals hardly protruding from calyx/rocky coastlines/May
Silene tridentata (Caryophyllaceae) Hairy annual/leaves lanceolate above, oblanceolate or obovate below/flowers sessile/calyx 11-14 mm/petals entire or lobed
Silene vulgaris Bladder Campion (Caryophyllaceae) Plant with lanceolate leaves/flowers 12-16 mm/petals divided/calyx inflated/fields-road sides/May-June
Spergularia bocconei Greek Sea-spurrey (Caryophyllaceae) Herb with papery stipules/ leaves with terminal bristle/flowers 7-9 mm/3 styles/10 stamens/fields-rocky coastlinesmarshland-road sides/Dec-June
Spergularia marina (Caryophyllaceae) Hairy annual/leaves succulent/flowers 6-8 mm/ petals entire/10 stamens/sepals approximately as big as the petals/Apr-Sep
Spergularia nicaeensis (Caryophyllaceae) Plant with succulent leaves/flowers 9-12 mm/ 10 stamens/Mar-July
Stellaria media (Caryophyllaceae) Hairy annual/leaves hairless/leaves ovate or lanceolate/ flowers 4-7 mm/petals divided/0-10 stamens/fields-road sides/Jan-June
Stellaria pallida Lesser Chickweed (Caryophyllaceae) Annual/leaves acutely ovate/ flowers 4-5 mm/2 stamens/fields-walls-rocky soils-road sides/Jan-Dec
Vincetoxicum hirundinaria Swallow-wort (Asclepiadaceae) Plant with acutely-ovate leaves/base of leaves cordate/flowers 5-10 mm/rock crevices/May-July
Cow Basil Vaccaria hispanica (Caryophyllaceae)
| Flowers small | |
| 1A-Leaves lanceolate | Silene apetala |
| 1B-Leaves fleshy | |
| 2B-Leaves almost imbricate | Crassula tillaea |
| 2C-Leaves not so | Crassula vaillantii |
Crassula tillaea Mossy Stonecrop (Crassulaceae) Moss-like plant/leaves almost overlapping, ovate-lanceolate, succulent/petals < sepals/petals 1 mm/fields-road sidesrock crevices/Jan-Aug
Crassula vaillantii Narrow-leaved Mossy Stonecrop (Crassulaceae) Annual/flowers 1-2 mm/leaves succulent/leaf stalk longer than the leaves/marshland/Menorca/Mar-June
Silene apetala (Caryophyllaceae) Hairy annual/lower leaves narrow and lanceolate, upper leaves linear-lanceolate/petals missing or hidden in calyx/3 styles/calyx 7-10 mm/fieldsroad sides/Feb-Mar
| 2-4 petals | |
| 1A-Flowers with 2 or 3 petals | Crassula tillaea |
| 1B-Flowers with 4 petals | |
| 2A-Flowers up to 2 mm big | Crassula vaillantii |
| 2B-Flowers 4-5 mm | Exaculum pusillum |
Crassula tillaea Mossy Stonecrop (Crassulaceae) Moss-like plant/leaves almost overlapping, ovate-lanceolate, succulent/petals < sepals/petals 1 mm/fields-road sidesrock crevices/Jan-Aug
Crassula vaillantii Narrow-leaved Mossy Stonecrop (Crassulaceae) Annual/flowers 1-2 mm/leaves succulent/leaf stalk longer than the leaves/marshland/Menorca/Mar-June
Exaculum pusillum (Gentianaceae) Herb with lanceolate leaves/flowers 4-5 mm/stigma divided in 2
| 5 petals | |
| 1A-Sepals of the flower fused | |
| 2A-Flowers with 2 styles | |
| 3A-Stem without hairs | |
| 4A-Flowers 6-8 mm | Gypsophila pilosa |
| 4B-Flowers 8-16 mm | Vaccaria hispanica (p. 24) |
| 4C-Flowers > 16 mm | Saponaria officinalis (199) |
| 3B-Stem with hairs | |
| 4A-Leaf sheath < 2x as long as wide | Petrorhagia nanteuilii |
| 4B-Leaf sheath much longer than wide | Petrorhagia dubia |
| 2B-Flowers with 3-5 styles | |
| 3A-Calyx of the flower < 13 mm | |
| 4A-Petals not visible or lacking | Silene apetala |
| 4B-Petals entire | |
| 5A-Calyx < 3 mm | Silene gallica |
| 5B-Calyx 11-14 mm | Silene tridentata |
| 4C-Petals lobed | |
| 5A-Calyx not contracted | Silene rubella |
| 5B-Calyx opening contracted | Silene cerastoides |
| 4D-Petals deeply divided | |
| 5A-Flowers solitary | Silene colorata |
| 5B-Flowers in groups of 2-8 | Silene nicaeensis |
| 3B-Calyx of the flower > 13 mm | |
| 4A-Flowers in groups of 1-3 | |
| 5A-Stem with glandular hairs | Silene almolae |
| 5B-Stem without glandular hairs | Silene sericea |
| 4B-Flowers in groups of > 3 | |
| 5A-Plants without hairs | Silene muscipula |
| 5B-Plants (almost) hairless | Silene secundiflora |
| 5C-Plants with hairs | |
| 6A-Petals entire | Silene pseudatocion* |
| 6B-Petals of the flower divided | |
| 7A-Plants woody below | Silene hifacensis* |
| 7B-Plants not woody below | Silene bellidifolia |
| 1B-Sepals of the flower separated | |
| 2A-Petals of the flower fused | |
| 3A-Leaves with stalks | Nerium oleander (7) |
| 3B-Leaves sessile | |
| 4A-Stem 4-angled | |
| 5A-Petals > sepals | Anagallis tenella |
| 5B-Petals and sepals of equal length | Anagallis arvensis (9) |
| 4B-Stem not 4-angled | |
| 5A-Flowers 5-9 mm/stems branched | Centaurium pulchellum |
| 5B-Flowers bigger | |
| 6A-Flowers salmon coloured | Centaurium bianoris * |
| 6B-Flowers pink | Centaurium erythraea (30) |
| 2B-Petals of the flower separated | |
| 3A-Leaves without stipules | |
| 4A-Flowers with 4-5 stamens | |
| 5A-Flowers 5-9 mm/stems branched | Centaurium pulchellum |
| 5B-Flowers bigger | |
| 6A-Flowers salmon coloured | Centaurium bianoris * |
| 6B-Flowers pink | Centaurium erythraea (30) |
| 4B-Flowers with 6 stamens | |
| 5A-Flowers terminal | Frankenia hirsuta |
| 5B-Flowers different | Frankenia
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