"I don't expect you will really understand the beauty of the softly simmering cauldron with its shimmering fumes, the delicate power of liquids that creep through human veins, bewitching the mind, ensnaring the senses...I can teach you how to bottle fame, brew glory, even stopper death -- if you aren't as big a bunch of dunderheads as I usually have to teach."
     -- Severus Snape

Potions are magical liquids created by mixing various ingredients in a cauldron according to very specific rules. These mixtures must usually be drunk to give their magical effect. The ingredients in potions range from the mundane to the bizarre and fantastic, and the procedures for creating some potions can be complicated and time-consuming. Severus Snape is the Potions Master at Hogwarts. His classroom is located in a chilly, dark dungeon. 

potion equipment
potion ingredients
Potions class
Magical Plants
non-magical plants

potion ingredients
Potion ingredients are available for student use from the Student Store cupboard. Students also buy their own ingredients as part of their school supplies, and purchase additional materials and refills every year. The Apothecary in Diagon Alley is where many Wizards buy their potion-making supplies. Snape maintains his own private stores which include ingredients not available in the Student Store Cupboard, including Boomslang Skin and Gillyweed.

Abyssinian shrivelfig
needs to be peeled (CS15)

aconite
(also called monkshood and wolfbane) (SS8)

Antipodean Opaleye dragon eggshells
(FB)

armadillo bile
(GF27) Wit-Sharpening Potion

Ashwinder eggs
(FB) frozen

asphodel, root of 
(SS8)
powdered

belladonna, essense of 
(GF10)

bezoar (SS8, GF)
comes from the stomach of a goat, protects from most poisons

bicorn horn
powdered (CS10)

Billywig stings
(FB) dried

black beetle eyes
(SS

boomslang skin
shredded (CS10)

bubotubor pus (GF)
good against stubborn acne; yellowish, smells of petrol

Bundimun secretion
(FB) 

caterpillars
(PA7) sliced

daisy roots
(PA7) chopped

dragon
hide, blood, heart, liver, horn (FB,

Erumpent
horns, tails, and Exploding Fluid (FB)

fluxweed
(CS10) picked at full moon

frog brains
(CS
gillyweed (GF
eating a wad of this grows gills and webbed fingers and toes so that a person can swim and breathe underwater. Native to the Mediterranean Sea.

ginger
roots (GF27) cut

Graphorn
horn (FB) powdered

horned toads
Neville had to disembowel a barrel of these for Snape

horned slugs
(SS8)

Jobberknoll feathers
for Memory Potions and Truth Serums (FB)

knotgrass
(CS10, 11)

lacewing flies
(CS10) stewed 21 days

leeches (CS10,11)
     leech juice (PA7)

lionfish, 
spine of (GF10)

mandrake
(CS

monkshood
(see aconite)

nettles
dried (SS8)

porcupine quills
(SS8)

puffer-fish eyes
(CS11)

rat tails, spleen
rat spleen (PA7)
tails - used in hair-raising potion (CS

Romanian Longhorn dragon horn
(FB) powdered

scarab beetles
(GF27) crushed

shrivelfig
Abyssinian (PA7) skinned

snake fangs
crushed (SS8)

spiders
(CS

tubeworms
(CS9)
Harry had to stay behind in Potions and scrape tubeworms off a desk

unicorn horns, tail hair
(SS

wolfsbane
(see aconite)
Scott Cunningham's "Encyclopedia of Magical Herbs" informs us that  a folk name for the highly poisonous Wolf's Bane is "Dumbledore's Delight"

wormwood
(SS8)