Malvella leprosa |
Malvella sagittifolia |
|
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alkali sida, alkali-mallow, dollar-weed, oreja de ratón, scurfy sida, white-weed |
arrowleaf mallow |
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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 |
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)
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AZ; CO; NM; TX; Mexico (Chihuahua, Coahuila, Durango, San Luis Potosí, Sonora, Tamaulipas)
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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 | ||
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) |
Web links |