Key to pollen samples included in this SEM image collection.
These specimens have been acetolyzed (except where indicated) to remove cytoplasm and pollenkit in order to reveal the intricate wall structure.

Image set 0. Image set 1. Image set 2. Image set 3. Image set 4. Image set 5 (unacetolyzed).

Globe Alium and Allium bulgaricum - Order: Asparagales Family: Alliaceae Genus: Allium (onion). TAG=Alium
Amaranthus - Amaranthus opopeo Order: Caryophyllales Family: Amaranthaceae Subfamily: Amaranthoideae Genus: Amaranthus Genus_species: Amaranthus opopeo TAG=Amaranth
Dill- Order: Apiales Family: Apiaceae Genus: Anethum Genus_species: Anethum graveolens TAG=Dill
Common Sunflower - Order: Asterales Family: Asteraceae Genus_species: Helianthus annuus . TAG= Sunf
Golden Rod/or Ragweed - Order: Asterales Family: Asteraceae Genus_species: Solidaga vigaurea TAG=Rag
Birch_Paper - Order: Fagales Family: Betulaceae Genus: Betula Species: B. papyrifera TAG=PBirch
Schlumbergera truncata , also known as Thanksgiving Cactus, frequently mislabeled Christmas Cactus - Order: Caryophyllales Family: Cactaceae Subfamily: Cactoideae Tribe: Rhipsalideae Genus: Schlumbergera Genus_species: Schlumbergera truncata TAG=Schlum
Epiphyllum Pink and yellow - Order: Caryophyllales Family: Cactaceae Genus: Epiphyllum TAG=Epi
Geranium - Order: Geraniales Family: Geraniaceae Genus: Geranium Genus_species: Geranium cinereum TAG=Ger
Heavenly blue morning glory - Order: Solanales Family: Convolvulaceae (morning glory) family Genus: Ipomea Genus_species: Ipomea purpurea TAG=MGlory
Rhododendron - Order: Ericales Family: Ericaceae Genus: Rhododendron Subgenus: Rhododendron TAG=Rhod
Castor bean plant - Order: Euphorbiales Family: Euphorbiaceae (spurge) family Genus: Ricinus Genus_species: Ricinus communis 'Sanguineus' TAG=Ricin
Oriental and Trumpet Lily - Order: Liliales Family: Liliaceae (lily) family Genus: Lilium Genus_species: Lilium auratum , Lilium longiflorum, TAG=Oliy;DLily
Rose Mallow - Order: Malvales Family: Malvaceae (mallow) family Subfamily: Malvoideae Genus: Malva Genus_species: Malva alcea 'Fastigiata' TAG=mallow
Hibiscus - Order: Malvales Family: Malvaceae Genus: Hibiscus TAG=Hibiscus
Prairie hollyhock - Order: Malvales Family: Malvaceae (mallow) family Subfamily: Malvoideae Genus: Sildalcea Genus_species: Sildalcea malviflora TAG=Sildalcea
Primrose, "Sundrops"- Order: Myrtales Family: Onagraceae (primose) family. Genus: Oenothera Genus_species: Oenothera fruticosa TAG=primrose
Peony - Order: Saxifragales Family: Paeoniaceae Genus: Paeonia Genus_species: Paeonia lactiflora (Chinese) TAG=peony
Eastern White Pine - Order: Pinales Family: Pinaceae Genus: Pinus Species: P. strobes TAG=Pine
Beach Rose (Rosa rugosa ) - Order: Rosales Family: Rosaceae Subfamily: Rosoideae Genus: Rosa Species: Rosa rugosa TAG=Rose
Citrus lemon - Order: Sapindales Family: Rutaceae Genus: Citrus Species: lemon ( C. ? limon ) TAG=citrus
Blue Wave Petunia - Order: Solanales Family: Solanaceae Genus: Petunia TAG=Pet
Nicotiana Alata - Order: Solanales Family: Solanaceae Genus: Nicotiana Genus_species: Nicotiana alata TAG=NAlata
Corn - Order: Poales Family: Poaceae Genus: Zea Genus_species: Zea mays TAG=Corn

Dartmouth Electron Microscope Facility