used as a lubricant and as a moderator in nuclear reactors
pampas grass
Noun
tall perennial grass of pampas of South America having silvery plumes and growing in large dense clumps
plumed tussock
Noun
tall grass of New Zealand grown for plumelike flower heads
plume grass
Noun
a reedlike grass of the genus Erianthus having large plumes
pearl millet
Noun
tall grass having cattail like spikes
perennial ryegrass
Noun
European perennial grass widely cultivated for pasture and hay and as a lawn grass
prairie cordgrass
Noun
North American cordgrass having leaves with dry membranous margins and glumes with long awns
prairie grass
Noun
handsome hardy North American grass with foliage turning pale bronze in autumn
panic grass
Noun
any grass of the genus Panicum
paspalum
Noun
tall tufted perennial tropical American grass naturalized as pasture and forage grass in southern United States
pumpkin vine
Noun
a coarse vine widely cultivated for its large pulpy round orange fruit with firm orange skin and numerous seeds
paper rush
Noun
tall sedge of the Nile valley yielding fiber that served many purposes in historic times
paper plant
Noun
tall sedge of the Nile valley yielding fiber that served many purposes in historic times
prairie gourd
Noun
perennial vine of dry parts of central and southwestern United States and Mexico having small hard mottled green inedible fruit
prairie gourd
Noun
small hard green-and-white inedible fruit of the prairie gourd plant
prairie gourd vine
Noun
perennial vine of dry parts of central and southwestern United States and Mexico having small hard mottled green inedible fruit
pandanus
Noun
any of various Old World tropical palmlike trees having huge prop roots and edible conelike fruits and leaves like pineapple leaves
pandanus
Noun
fiber from leaves of the pandanus tree
poppy mallow
Noun
a plant of the genus Callirhoe having palmately cleft leaves and white to red or purple flowers borne throughout the summer
purple poppy mallow
Noun
hairy perennial of central United States having round deeply lobed leaves and loose panicles of large crimson-purple or cherry-red flowers
phoenix tree
Noun
deciduous tree widely grown in southern United States as an ornamental for its handsome maplelike foliage and long racemes of yellow-green flowers followed by curious leaflike pods
pavonia
Noun
any of various evergreen plants of the genus Pavonia having white or yellow or purple flowers
prairie mallow
Noun
false mallow of western United States having racemose red flowers
portia tree
Noun
pantropical tree of usually seacoasts sometimes cultivated as an ornamental for its rounded heart-shaped leaves and showy yellow and purple flowers
purau
Noun
shrubby tree widely distributed along tropical shores
phalsa
Noun
drought-resistant Asiatic treelike shrub bearing pleasantly acid small red edible fruits commonly used in sherbets
pig laurel
Noun
North American dwarf shrub resembling mountain laurel but having narrower leaves and small red flowers
prickly ash
Noun
Australian tree having alternate simple leaves (when young they are pinnate with prickly toothed margins) and slender axillary spikes of white flowers
prickly ash
Noun
any of a number of trees or shrubs of the genus Zanthoxylum having spiny branches
protea family
Noun
large family of Australian and South African shrubs and trees with leathery leaves and clustered mostly tetramerous flowers
protea
Noun
any tropical African shrub of the genus Protea having alternate rigid leaves and dense colorful flower heads resembling cones
pincushion hakea
Noun
tall straggling shrub with large globose crimson-yellow flowers
pinesap
Noun
fleshy tawny or reddish saprophytic herb resembling the Indian pipe and growing in woodland humus of eastern North America
pyxie
Noun
creeping evergreen shrub having narrow overlapping leaves and early white star-shaped flowers
purple beech
Noun
variety of European beech with shining purple or copper-colored leaves
pink fivecorner
Noun
heathlike shrub of southwestern Australia grown for its sharply scented foliage and pink flowers followed by pentagonal fruit
pyrola
Noun
any of several evergreen perennials of the genus Pyrola
privet andromeda
Noun
deciduous much-branched shrub with dense downy panicles of small bell-shaped white flowers
pipsissewa
Noun
any of several plants of the genus Chimaphila
prince's pine
Noun
any of several plants of the genus Chimaphila
pepper bush
Noun
shrub of eastern and southern coastal United States having beautiful racemes of spice-scented white flowers
possum oak
Noun
relatively tall deciduous water oak of southeastern United States often cultivated as a shade tree
prairie gentian
Noun
one of the most handsome prairie wildflowers having large erect bell-shaped bluish flowers
pyramid plant
Noun
any of various tall perennial herbs constituting the genus Frasera
pedunculate oak
Noun
medium to large deciduous European oak having smooth leaves with rounded lobes
post oak
Noun
small deciduous tree of eastern and central United States having dark green lyrate pinnatifid leaves and tough moisture-resistant wood used especially for fence posts
pin oak
Noun
large nearly semi-evergreen oak of southeastern United States
pin oak
Noun
fast-growing medium to large pyramidal deciduous tree of northeastern United States and southeastern Canada having deeply pinnatifid leaves that turn bright red in autumn
paper birch
Noun
small American birch with peeling white bark often worked into e.g. baskets or toy canoes
paperbark birch
Noun
small American birch with peeling white bark often worked into e.g. baskets or toy canoes