Alcea rosea

Linnaeus

Sp. Pl. 2: 687. 1753

Common names: Common hollyhock rose trémière
Selected by author to be illustratedIntroducedWeedy
Synonyms: Alcea ficifolia Linnaeus A. glabrata Alefeld Althaea ficifolia (Linnaeus) Cavanilles A. mexicana Kunze A. rosea (Linnaeus) Cavanilles A. rosea var. sinensis (Cavanilles) S. Y. Hu A. sinensis unknown
Treatment appears in FNA Volume 6. Treatment on page 228. Mentioned on page 229.
Click plate for higher resolution version.
Plants 1–2.5+ m, roughly stellate-hairy to hirsute. Leaves: stipules ovate, 8 mm, apically 3-lobed; petiole equaling or longer than blade; blade suborbiculate to 5–7-angled or shallowly triangular-lobed, sometimes more deeply channeled and winged dorsally, 6–8 mm. Seeds tuberculate or not, often minutely hairy. 2n = 42.

Phenology: Flowering May–Oct; fruiting Jun–Oct.
Habitat: Disturbed sites, roadsides, vacant lots
Elevation: 0–3000 m

Distribution

V6 407-distribution-map.jpg

N.B., Ont., Que., Ariz., Calif., Colo., Conn., Del., D.C., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., Nev., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Oreg., Pa., R.I., S.Dak., Tenn., Tex., Utah, Vt., Va., Wash., W.Va., Wis., Wyo., Asia (China), introduced also nearly worldwide.

Discussion

Alcea rosea is a showy and popular ornamental that is essentially cosmopolitan in cultivation. The species is thought to have originated in the southwestern provinces of China but is apparently not known in the wild. It occasionally escapes and naturalizes in disturbed temperate areas nearly worldwide. However, it is often difficult to determine if a given specimen was cultivated or an established adventive. Plants with more deeply lobed leaves and rose-pink flowers have been called A. ficifolia; plants in cultivation under this name are most likely a mix of A. rosea and A. rugosa or of hybrid origin.

References

None.

Lower Taxa

No lower taxa listed.