Portulaca grandiflora Hook.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Stems diffusely branched, ascending or widely spreading, 2–4 dm, hairy at the nodes; lvs linear, subterete, 1–3 cm, the cauline alternate, the terminal crowded, forming an involucre intermingled with long hairs; fls white or various brilliant shades of red or yellow, 2–4 cm wide; stamens numerous, ca 40 or more; style-branches 5–9; 2n=18, 36. Native of Argentina, occasionally escaped from cult. All summer.