the genera Cotyledon and Omphalodes. Nettlewort - Any plant of the nettle family, Urticaceae. Nipplewort - Lapsana communis. Peachwort - Lady's Thumb, Polygonum persicaria. Pearlwort - Pearl grass; pearl plant; any species of the genus Sagina. Pennywort - Linaria cymbalaria. Also, any one of a number of peltate-leaved plants. Watercup; trumpetleaf. Also Gotu Kola (Centella asiatica) and species from genus Hydrocotyle. Pepperwort - Lepidium latifolium; Lepidium campestre; Spanish cress, Lepidium cardamines. Peppergrass; cockweed; dittander; Marsilea minuta Peterwort - Saint Peter's wort. Pilewort - Lesser celandine. Pipewort - Eriocaulon. Quillwort - Isoetes, of the quillwort family; certain seedless plants or "fern allies". Quinsywort - Asperula cynanchica. Common ragwort - Jacobaea vulgaris, and some other plants of the genus Jacobaea (once called cankerweed). Rattlewort - rattlebox, Crotalaria sagittalis. Ribwort - Plantago lanceolata. Hen plant. English plantain, the common plantain introduced into the United States from Europe. Rosewort - A plant of the rose family, Rosaceae. Also, roseroot, Rhodiola rosea, whose root has the fragrance of a rose. Rupturewort - Alternanthera polygonoides. Also species of Herniaria, such as Smooth Rupturewort, H. glabra. Saltwort - A vague and indefinite name applied to any halophyte of the genus Salsola. Salsola kali is the prickly saltwort. Also, some species of Salicornia, the glassworts, are called saltworts. Sandwort - A plant of the genus Arenaria. One of the Caryophyllaceae. Sawwort - A plant of the genus Serratula, especially Serratula tinctoria. Also, plants in the genus Saussurea. Scorpionwort - either Ornithopus scorpioides or scorpion grass, the forget-me-not. Scurvywort - Lesser celandine. Sea Lungwort - Mertensia maritima. Sea Milkwort - Of the primrose family, Primulaceae. Sea ragwort - Dusty miller, Jacobaea maritima. Sea sandwort - A plant of the North Atlantic seacoast. Sea starwort - Aster Tripolium. Setterwort - Helleborus foetidus. Pegroots; setter grass; bear's foot. Sicklewort - Prunella vulgaris, the healall. Sleepwort - Lettuce, especially Lactuca virosa Slipperwort - A plant of the genus Calceolaria. Sneezewort - Achillea ptarmica. Goosetongue; Bastard pellitory. Soapwort - One of the bruiseworts. Sparrowwort - A general name for the plants of the genus Passerina Spearwort - A plant of the genus Ranunculus. Spiderwort - Tradescantia virginica. Also species in the genus Commelina, such as Blue Spiderwort, C. coelestis. Spleenwort - Asplenium. A large genus of ferns; formerly used for spleen disorders. Spoonwort - Any plant of the genus Cochlearia, as Cochlearia officinalis. Scurvy grass. Springwort - Euphorbia lathyris. Caper spurge. Spurwort -