| bastard indigo | (n) East Indian shrub, Syn. Tephrosia purpurea |
| beggarweed | (n) West Indian forage plant cultivated in southern United States as forage and to improve soil, Syn. Desmodium purpureum, Desmodium tortuosum |
| common foxglove | (n) tall leafy European biennial or perennial having spectacular clusters of large tubular pink-purple flowers; leaves yield drug digitalis and are poisonous to livestock, Syn. finger-root, fingerflower, finger-flower, fairy bell, fingerroot, Digitalis purpurea |
| common morning glory | (n) pantropical annual climbing herb with funnel-shaped blue, purple, pink or white flowers, Syn. Ipomoea purpurea |
| common pitcher plant | (n) perennial bog herb having dark red flowers and decumbent broadly winged pitchers forming a rosette; of northeastern North America and naturalized in Europe especially Ireland, Syn. huntsman's cups, Sarracenia purpurea, huntsman's cup |
| copper beech | (n) variety of European beech with shining purple or copper-colored leaves, Syn. Fagus sylvatica purpurea, purple beech, Fagus sylvatica atropunicea, Fagus purpurea |
| ergot | (n) a fungus that infects various cereal plants forming compact black masses of branching filaments that replace many grains of the plant; source of medicinally important alkaloids and of lysergic acid, Syn. Claviceps purpurea |
| hyacinth bean | (n) perennial twining vine of Old World tropics having trifoliate leaves and racemes of fragrant purple pea-like flowers followed by maroon pods of edible seeds; grown as an ornamental and as a vegetable on the Indian subcontinent; sometimes placed in genus Dolichos, Syn. Egyptian bean, bonavist, Indian bean, Lablab purpureus, Dolichos lablab |
| joe-pye weed | (n) North American herb having whorled leaves and terminal clusters of flowers spotted with purple, Syn. purple boneset, trumpet weed, Eupatorium purpureum, marsh milkweed |
| mombin | (n) common tropical American shrub or small tree with purplish fruit, Syn. Spondias purpurea, jocote, mombin tree |
| purple finch | (n) North American finch having a raspberry-red head and breast and rump, Syn. Carpodacus purpureus |
| purple rock brake | (n) very short shallowly creeping North American fern usually growing on cliffs or walls and having dark glossy leaf axes, Syn. Pellaea atropurpurea |
| purple willow | (n) Eurasian osier having reddish or purple twigs and bark rich in tannin, Syn. basket willow, red willow, Salix purpurea, purple osier, red osier |
| rattlesnake root | (n) herb of central and southern Europe having purple florets, Syn. Prenanthes purpurea |
| sweet scabious | (n) Old World annual having fragrant purple to deep crimson flower heads; naturalized in United States, Syn. Scabiosa atropurpurea, pincushion flower, mournful widow |
| wahoo | (n) deciduous shrub having purple capsules enclosing scarlet seeds, Syn. burning bush, Euonymus atropurpureus |