Plants — 23,508 Species

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Brewer's spruce
Pinaceae

Brewer's spruce

Picea breweriana S.Watson

Picea breweriana, or Brewer's spruce, is a large slow-growing endemic conifer often grown as an ornamental tree.

Engelmann spruce
Pinaceae

Engelmann spruce

Picea engelmannii Parry ex Engelm.

Picea engelmannii (Engelmann spruce) is an evergreen mountain tree native to western North America, harvested for timber and wood products.

white spruce
Pinaceae

white spruce

Picea glauca (Moench) Voss

Picea glauca, white spruce, is a hardy North American evergreen conifer with economic and ecological importance.

black spruce
Pinaceae

black spruce

Picea mariana (Mill.) Britton et al.

Picea mariana (black spruce) is a boreal North American conifer with ecological, commercial, and ornamental uses.

Siberian spruce
Pinaceae

Siberian spruce

Picea obovata Ledeb.

Picea obovata, or Siberian spruce, is a medium-sized evergreen timber tree native to Siberia and Mongolia with many uses.

blue spruce
Pinaceae

blue spruce

Picea pungens Engelm.

Picea pungens (blue spruce) is a Rocky Mountain native conifer widely cultivated as an ornamental and Christmas tree.

red spruce
Pinaceae

red spruce

Picea rubens Sarg.

Picea rubens Sarg. (red spruce) is a late successional conifer native to high eastern North American elevations, with many practical uses.

Schrenk's spruce
Pinaceae

Schrenk's spruce

Picea schrenkiana Fisch. & C.A.Mey.

Schrenk's spruce (Picea schrenkiana) is a large evergreen conifer used for timber, paper, and ornamental planting.

Sitka spruce
Pinaceae

Sitka spruce

Picea sitchensis (Bong.) Carrière

Picea sitchensis (Sitka spruce) is a large coastal conifer with many commercial and traditional human uses.

chaparral pea
Fabaceae

chaparral pea

Pickeringia montana Nutt.

Pickeringia montana, the chaparral pea, is a thorny thicket-forming plant with two subspecies native to California.

Yellow-spine Thistle
Asteraceae

Yellow-spine Thistle

Picnomon acarna (L.) Cass.

Picnomon is an Asteraceae genus with only one known species, Picnomon acarna, native from Europe to Kazakhstan.

hairyseed bahia
Asteraceae

hairyseed bahia

Picradeniopsis absinthifolia (Benth.) B.G.Baldwin

Picradeniopsis absinthifolia is a North American perennial desert aster with yellow flowers native to Mexico and the southwestern US.

Hawkweed Oxtongue
Asteraceae

Hawkweed Oxtongue

Picris hieracioides L.

Picris hieracioides L., or hawkweed oxtongue, is a Eurasian native invasive herb with yellow summer flowers.

Japanese andromeda
Ericaceae

Japanese andromeda

Pieris japonica (Thunb.) D.Don ex G.Don

Pieris japonica is an acid-loving toxic poisonous temperate ornamental shrub with colorful new growth and spring blooms.

Shrub Violet
Violaceae

Shrub Violet

Pigea floribunda (Lindl.) Lindl.

Pigea floribunda is a disputed-named perennial shrub violet in the Violaceae family native to southern Australia.

Artillery Plant
Urticaceae

Artillery Plant

Pilea microphylla (L.) Liebm.

Pilea microphylla is a small monoecious plant named for its explosive pollen ejection by male flower stamens.

Canada clearweed
Urticaceae

Canada clearweed

Pilea pumila (L.) A.Gray

Pilea pumila, also called Canadian clearweed, is an edible annual plant with known ecological roles, traditional medicinal uses, and educational applications.

camels-foot monkeybread
Fabaceae

camels-foot monkeybread

Piliostigma thonningii (Schumach.) Milne-Redh.

Piliostigma thonningii is an African dioecious tree adapted to bush fires, whose inner bark is used to make rope.

Fireflag
Iridaceae

Fireflag

Pillansia templemannii (Baker) L.Bolus

Pillansia is a monotypic Iridaceae genus whose only species Pillansia templemannii is endemic to South Africa’s Cape Province.

Florida pennyroyal
Lamiaceae

Florida pennyroyal

Piloblephis rigida (W.Bartram ex Benth.) Raf.

Piloblephis is a monotypic Lamiaceae genus with one native species, Piloblephis rigida, wild pennyroyal.

orange hawkweed
Asteraceae

orange hawkweed

Pilosella aurantiaca (L.) F.W.Schultz & Sch.Bip.

Pilosella aurantiaca is a low-growing flowering herb native to much of Europe, used in horticulture and European folk medicine.

meadow hawkweed
Asteraceae

meadow hawkweed

Pilosella caespitosa (Dumort.) P.D.Sell & C.West

Pilosella caespitosa is a creeping perennial hawkweed, often a noxious invasive weed in North America, historically used for eyesight.

Pilosella echioides (Lumn.) F.W.Schultz & Sch.Bip.
Asteraceae

Pilosella echioides (Lumn.) F.W.Schultz & Sch.Bip.

Pilosella echioides (Lumn.) F.W.Schultz & Sch.Bip.

Pilosella echioides is a flowering plant in the Asteraceae family native from Europe to Central Siberia and the Himalaya.

Yellow-devil
Asteraceae

Yellow-devil

Pilosella floribunda (Wimm. & Grab.) Fr.

Pilosella floribunda is a flowering plant with hairy spatula-shaped leaves that blooms clustered flowers from June to July.

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