Annual Rock-Rose
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Tuberaria guttata (Helianthemum guttatum)
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May-August
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An autumn- and spring-germinating annual found in bare patches of thin, dry soil overlying hard igneous rock in open areas within wind-cut heath near the sea. In Ireland it sometimes grows in areas where burning has taken place the previous year. It may occur with a sparse growth of other small annuals, and is typically found in lichen-rich communities. Lowland.
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Common Rock-Rose
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Helianthemum chamaecistus
(Helianthemum nummularium)
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May-September
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A prostrate sub-shrub occurring in short, dry, calcareous grassland, and rather strictly confined to chalk and limestone in England, but extending into mildly acid pastures and heaths on well-drained soils in E. Scotland, and on base-rich soils over basalt in N.E. England and E. Scotland. 0-640 m (Mickle Fell, N.W. Yorks., and in Atholl, E. Perth).
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Hoary Rock-Rose
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Helianthemum canum
(Helianthemum oelandicum)
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May-June
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This small, prostrate, perennial sub-shrub is often abundant in short, open, rocky Carboniferous limestone grassland, on rock outcrops and on cliff edges. It typically grows in exposed S.- to W.-facing sites. 0-540 m (Cronkley Fell, N.W. Yorks.).
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Flower from North England in June
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Flowers from North England in June
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Foliage from Poulsallagh on 12 June
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Form from Poulsallagh on 12 June
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White Rock-Rose
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Helianthemum apenninum
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May-July
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A perennial sub-shrub, found in open, dry rocky limestone grassland (of which it is a conspicuous component where it occurs), generally on S-facing slopes; also limestone crags and cliff edges. It is found on more skeletal soils than H. nummularium, and hybrid plants (H. x sulphureum) may be found in intermediate habitats at sites where both species occur. Lowland.
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