| Author | L. | |
| Distribution | Widespread from the Outer Banks through the Piedmont; rare in the southern Mountains. Absent apparently from the northwestern Piedmont and most of the Mountains.
Native of China (says FNA 2015). In N.A., VA to FL and TX, inland to AR and KS. | |
| Abundance | Frequent to common in the Coastal Plain and much of the Piedmont; rare elsewhere. | |
| Habitat | Roadsides, railroads, fields, cropfields, river margins, garden weed, disturbed ground. |
| Phenology | Flowering and fruiting April-October. | |
| Identification | Arrowleaf Sida is a weedy herb or sub-shrub with a stiff stem to 3 feet tall. Leaves are somewhat rhombic, 1.5-3.5 inches long and stellate-pubescent beneath (sometimes also above), the margins blunt-toothed. The flowers grow in leaf axils on stalks that are shorter than the leaf length; the petals are dull yellow, 7-9 mm long, the upper half of each petal bent clockwise. The also common alien S. spinosa is similar but has a spine below each leaf, and the narrower leaves are usually truncate at the base as opposed to more rounded or cuneate. | |
| Taxonomic Comments | | |
| Other Common Name(s) | Arrowleaf Fanpetals | |
| State Rank | SE | |
| Global Rank | G5 | |
| State Status | | |
| US Status | | |
| USACE-agcp | FACU link |
| USACE-emp | UPL link |
