Helianthemum nummularium

Helianthemum nummularium
	Helianthemum nummularium subsp. glabrum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Malvales
Family:	Cistaceae
Genus:	Helianthemum
Species:	H. nummularium
Binomial name
	Helianthemum nummularium; (L.) Mill.
Synonyms
	List Cistus mutabilis Jacq.; Cistus nummularius L.; Cistus roseus All.; Cistus serpillifolius L.; Cistus surrejanus L.; Helianthemum angustipetalum Cadevall; Helianthemum arcticum (Grosser) Janch.; Helianthemum barbatum Sweet; Helianthemum chamaecistus Mill.; Helianthemum croceum Ten.; Helianthemum graecum Boiss. & Heldr.; Helianthemum helianthemum H.Karst.; Helianthemum heterophyllum Schur; Helianthemum laevigatum Schur; Helianthemum macranthum Schur; Helianthemum multiflorum Ziz; Helianthemum mutabile (Jacq.) Moench; Helianthemum rupicola Schur; Helianthemum seguieri Pollini; Helianthemum serpillifolium (L.) Mill.; Helianthemum stabianum Heldr. ex Willk.; Helianthemum vulgare Garsault; Helianthemum vulgare Gaertn.; ;

Helianthemum nummularium (known as common rock-rose^[2]) is a species of rock-rose (Cistaceae), native to most of Europe.

Description

It is an evergreen trailing plant with loose terminal clusters of bright yellow, saucer-shaped flowers. In the flower centre is a tight cluster of orange stamens, which are sensitive to the touch, and spread outwards to reveal the tall stigma in the middle. The plant is common on chalk downs, and occasional in other grasslands, always on dry, base-rich soil. The wild species has yellow flowers, but garden varieties range from white through yellow to deep red.

Though the individual blooms are short-lived, the plant produces a mass of flowers through the summer. It needs a dry, sunny place, like a south-facing rockery or meadow. As the Latin name Helianthemum suggests, these are sun-flowers. This is a good pollen source for bees and there are several species of small beetle that feed on the foliage. Common rock-rose is also the food plant for the larvae of several species of moth and butterfly such as the silver-studded blue (Plebejus argus).

It flowers from May until July.

Taxonomy

Subspecies

Two subspecies are currently accepted:^[1]

Helianthemum nummularium subsp. kerneri (Gottl.-Tann. & Janch.) Lambinon
Helianthemum nummularium subsp. nummularium. Widespread.

Gallery

subsp. grandiflorum (Scop.) Schinz & Thell.

subsp. nummularium

subsp. obscurum (Čelak.) Holub)

H. nummularium subsp. obscurum
Germany - Schwäbisch Fränkische Waldberge
H. nummularium subsp. obscurum
Germany - Schwäbisch Fränkische Waldberge
H. nummularium subsp. obscurum
Germany - Schwäbische Alb
H. nummularium subsp. obscurum
Germany - Schwäbische Alb

Pink-flowered cultivars

Illustrations

flower diagram

Unclassified images of Helianthemum nummularium

References

^ ^a ^b "Helianthemum nummularium (L.) Mill". Plants of the World Online. Board of Trustees of the Royal Botanic Gardens, Kew. 2017. Retrieved 12 December 2020.
^ BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.

Flora Europaea: Helianthemum nummularium

[169032-1-1] "Helianthemum nummularium (L.) Mill". Plants of the World Online. Board of Trustees of the Royal Botanic Gardens, Kew. 2017. Retrieved 12 December 2020.

[BSBI07-2] BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.

[1]

[2]

Helianthemum nummularium

Helianthemum nummularium subsp. glabrum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Malvales
Family:	Cistaceae
Genus:	Helianthemum
Species:	H. nummularium
Binomial name
*Helianthemum nummularium* (L.) Mill.
Synonyms^[1]
List Cistus mutabilis Jacq. Cistus nummularius L. Cistus roseus All. Cistus serpillifolius L. Cistus surrejanus L. Helianthemum angustipetalum Cadevall Helianthemum arcticum (Grosser) Janch. Helianthemum barbatum Sweet Helianthemum chamaecistus Mill. Helianthemum croceum Ten. Helianthemum graecum Boiss. & Heldr. Helianthemum helianthemum H.Karst. Helianthemum heterophyllum Schur Helianthemum laevigatum Schur Helianthemum macranthum Schur Helianthemum multiflorum Ziz Helianthemum mutabile (Jacq.) Moench Helianthemum rupicola Schur Helianthemum seguieri Pollini Helianthemum serpillifolium (L.) Mill. Helianthemum stabianum Heldr. ex Willk. Helianthemum vulgare Garsault Helianthemum vulgare Gaertn.