prickle-weed
— Noun
– English
～ perennial herb of North American prairies having dense heads of small white flowers
polecat weed
— Noun
– English
～ deciduous perennial low-growing fetid swamp plant of eastern North America having minute flowers enclosed in a mottled greenish or purple cowl-shaped spathe
pickerel weed
— Noun
– English
～ American plant having spikes of blue flowers and growing in shallow water of streams and ponds
pearl-weed
— Noun
– English
～ any of various low-growing plants of the genus Sagina having small spherical flowers resembling pearls
pine-weed
— Noun
– English
～ annual wiry-stemmed North American weed with minute scalelike leaves and small yellow flowers
pineapple weed
— Noun
– English
～ annual aromatic weed of Pacific coastal areas (United States and northeastern Asia) having bristle-pointed leaves and rayless yellow flowers