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alkali sida, alkali-mallow, dollar-weed, oreja de ratón, scurfy sida, white-weed

arrowleaf mallow

Stems

prostrate, indument mixture of stellate and appressed, sublepidote hairs.

prostrate, trailing, invested with silvery-white, lepidote scales.

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.

petiole to 1/3 as long as blade;

blade narrowly triangular, 1.5–3.5 cm, usually 3–5(–6) times as long as wide, base truncate, margins entire with 2–4 hastate teeth at base, apex acute, surfaces with sparse, silvery-lepidote scales.

Pedicels

long, subequal to subtending petiole;

involucellar bractlets 3, inconspicuous, filiform, or 0.

long, usually shorter than subtending leaves, involucellar bractlets 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.

calyx 7–9 mm, silvery-lepidote, lobes cordate-ovate, bases plicate-overlapping, apex acuminate;

petals whitish or pale yellow, sometimes fading rose, asymmetric, 15 mm;

stamens pallid, glabrous, staminal column antheriferous at apex;

style 7- or 8-branched, pallid, glabrous.

Schizocarps

7 mm diam. 2n = 22, 32.

5–6 mm diam.

Malvella leprosa

Malvella sagittifolia

Phenology Flowering year-round in warmer areas. Flowering year-round in warmer areas.
Habitat Heavy, saline soil Heavy, saline soil, mud flats, along lake shores
Elevation 800–1500 m (2600–4900 ft) 30–1500 m (100–4900 ft)
Distribution
from FNA
AZ; CA; CO; ID; KS; NM; NV; OK; OR; TX; UT; WA; Mexico (Baja California, Chihuahua, Coahuila, Durango, San Luis Potosí, Sinaloa, Sonora); South America (Argentina, Chile, Peru, Uruguay)
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CO; NM; TX; Mexico (Chihuahua, Coahuila, Durango, San Luis Potosí, Sonora, Tamaulipas)
[WildflowerSearch map]
[BONAP county map]
Discussion

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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Malvella sagittifolia is known from Otero County, Colorado; Dona Ana County, New Mexico; in scattered locations in Texas but primarily in the Big Bend region; and in much of central and southern Arizona. The comparatively long leaves with hastate teeth, the lack of any stellate hairs, and the consistent lack of an involucel distinguishes this species.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 6, p. 302. FNA vol. 6, p. 302.
Parent taxa Malvaceae > subfam. Malvoideae > Malvella Malvaceae > subfam. Malvoideae > Malvella
Sibling taxa
M. lepidota, M. sagittifolia
M. lepidota, M. leprosa
Synonyms Malva leprosa, Disella hederacea, M. hederacea, M. sulphurea, Malvastrum sulphureum, Sida hederacea, S. leprosa, S. sulphurea Sida lepidota var. sagittifolia, Disella sagittifolia, S. sagittifolia
Name authority (Ortega) Krapovickas: Bonplandia (Corrientes) 3: 59. (1970) (A. Gray) Fryxell: SouthW. Naturalist 19: 102. (1974)
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