Plants (1–)2–5(–25+) cm (high or across), more or less villous, glabrescent (not stoloniferous, stems purplish, prostrate to ascending, often rooting at nodes). Leaves basal and cauline; blades ± oblanceolate, 1–2(–3)+ cm, 2(–3)-pinnati-palmately lobed. Heads mostly scattered along stems. Involucres 2–4(–5) mm diam. Florets without pappuses.; pistillate florets 5–8(–17+) in 1–2+ series; disc florets 4–8+, corollas 1.5–2.5 mm. Achenes: bodies more or less obovate to lanceolate, (1.5–)2.5–3+ mm, usually winged, wings entire or ± sinuate to incised, each shoulder usually distally projecting as spinelike tooth, faces glabrous or more or less scabrellous to hirtellous; persistent stylar sheaths indurate, spinelike, 1–2+ mm, erect or slightly inflexed. 2n = ca. 92 (as S. pterosperma), 110+ (from Portugal), 118–120.
Solica sessilis is naative to South America but is now found in tropical and semi-tropical regions in many parts of the world, including North America, Pakistan, and China. As treated here, it includes 3 variants that are sometimes treated as species. They differ in the shape of the achene wings and may grow together. Their treatment as a single species was recommended by Webb (1986) based on examination of plants growing in lawns in New Zealand. Flora of China (1986) and Mujahid & Shabir (2017) recognize the variants as species. Based on their treatment, Soliva pterosperma is the species present in Pakistan. Once keys and descriptions for the segregates has been obtained, the treatment presented here will be revised.
Mujahid, I. & A. Shabir. 2017. A new generic record of Asteraceae (Soliva anthemifolia (Juss.) Sweet & Soliva pterosperma (Juss.): Addition to the alien invasive flora of Pakistan. Pakistan Journal of Botany 49(4):1327-1333.
Webb, C.J. 1986. Variation in achene morphology and its implications for taxonomy in Soliva subgenus Soliva (Anthemideae, Asteraceae), New Zealand Journal of Botany, 24:4, 665-669, DOI: 10.1080/0028825X.1986.10409950.