Malvella leprosa

(Ortega) Krapovickas

Bonplandia (Corrientes) 3: 59. 1970.

Common names: Dollar-weed oreja de ratón scurfy sida
Basionym: Malva leprosa Ortega Nov. Pl. Descr. Dec. 8: 95. 1798
Synonyms: Disella hederacea (Douglas) Greene M. hederacea Douglas M. sulphurea Gillies ex Hooker & Arnott Malvastrum sulphureum (Gillies ex Hooker & Arnott) Grisebach Sida hederacea (Douglas) Torrey ex A. Gray S. leprosa (Ortega) K. Schumann S. sulphurea (Gillies ex Hooker & Arnott) A. Gray
Treatment appears in FNA Volume 6. Treatment on page 302. Mentioned on page 301.

Stems prostrate, indument mixture of stellate and appressed, sublepidote hairs. Leaves: petiole 1/2–1 times as long as blade; blade ± reniform, 1–3.5 cm, wider than long, base obliquely truncate, margins serrate, apex obtuse or subacute, surfaces densely hairy, hairs appressed, sublepidote and stellate. Pedicels long, subequal to subtending petiole; involucellar bractlets 3, inconspicuous, filiform, or 0. Flowers: calyx 8–10 mm, with mixture of stellate and appressed sublepidote hairs, lobes ovate, bases not plicate-overlapping, apex acuminate; petals pale yellow, sometimes with rose flush on fading, asymmetric, 12–15 mm; stamens pallid, glabrous, staminal column antheriferous at apex; style 7–10-branched, pallid, glabrous. Schizocarps 7 mm diam. 2n = 22, 32.

Phenology: Flowering year-round in warmer areas.
Habitat: Heavy, saline soil
Elevation: 800–1500 m


V6 547-distribution-map.jpg

Ariz., Calif., Colo., Idaho, Kans., Nev., N.Mex., Okla., Oreg., Tex., Utah, Wash., Mexico (Baja California, Chihuahua, Coahuila, Durango, San Luis Potosí, Sinaloa, Sonora), South America (Argentina, Chile, Peru, Uruguay).


Malvella leprosa is possibly introduced in Colorado. The species is considered to be a noxious weed in Arizona and California and increasing as saline soils increase.

Selected References


Lower Taxa

... more about "Malvella leprosa"
Paul A. Fryxell† +  and Steven R. Hill +
(Ortega) Krapovickas +
Malva leprosa +
Dollar-weed +, oreja de ratón +  and scurfy sida +
Ariz. +, Calif. +, Colo. +, Idaho +, Kans. +, Nev. +, N.Mex. +, Okla. +, Oreg. +, Tex. +, Utah +, Wash. +, Mexico (Baja California +, Chihuahua +, Coahuila +, Durango +, San Luis Potosí +, Sinaloa +, Sonora) +, South America (Argentina +, Chile +, Peru +  and Uruguay). +
800–1500 m +
Heavy, saline soil +
Flowering year-round in warmer areas. +
Bonplandia (Corrientes) +
Illustrated +  and Weedy +
Disella hederacea +, M. hederacea +, M. sulphurea +, Malvastrum sulphureum +, Sida hederacea +, S. leprosa +  and S. sulphurea +
Malvella leprosa +
Malvella +
species +