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Pollen Key for Selected Plants of the San Francisco Estuary Region

Organized alphabetically by Genus

Note: "top", "mid", and "bottom" refer to the location of the plane of focus relative to the pollen grain.

Aesculus california
California Buckeye
Pollen Type:
Notes:

Alnus rugosa
Alder
Pollen Type:
Notes:

Artemisia california
Sage
Pollen Type:
Notes:

low mid

Atriplex patula

Pollen Type:
Notes:

top top mid top mid

Botrychium simplex
Grape-Fern
Pollen Type:
Notes:

Ceanothus foliosis

Pollen Type:
Notes:

low

Cerocarpus ledifolius
Mountain Mahogony
Pollen Type:
Notes:

Cirsium californicum
High-spine Compositae
Pollen Type:
Notes:

top mid

Conium maculatum
Poison Hemlock
Pollen Type:
Notes: Peanut-like shape

Corylus california

Pollen Type:
Notes:

mid

Cressa truxillensis
Alkali Weed
Pollen Type:
Notes:

Distichlis spicata
Salt Grass
Pollen Type:
Notes:

mid

Dryopteris
Wood Fern
Pollen Type:
Notes:

Eriogonum crocatum

Pollen Type:
Notes:

mid

Eriogonum hooveri

Pollen Type:
Notes:

top mid

Eucaliptus globulus

Pollen Type:
Notes:

Juglans california
California Walnut
Pollen Type:
Notes:

top

Lithocarpus densiflora
Tan Oak
Pollen Type:
Notes:

Lycopodium spp.

Pollen Type: trilete (spore)
Notes: Used as a control in the Berkeley lab.

mid top showing trilete scar

Pinus contorta
Lodgepole Pine
Pollen Type:
Notes:

Potamogeton gramineus
Pondweed
Pollen Type:
Notes: Compare with Triglochin

Pteridium aquilinum
Fern
Pollen Type:
Notes:

Quercus agrifolia
Oak
Pollen Type:
Notes:

top mid

Rumex

Pollen Type:
Notes:

top mid bottom pole view

Salicornia virginica
Pollen Type: Periporate
Notes:

top mid

Salix lasiolepis
Willow
Pollen Type:
Notes:

Scirpus robustus
Tule
Pollen Type:
Notes: Rough surface texture is an important distinguishing feature.

Sequoia sempervirens
Redwood
Pollen Type:
Notes:

Typha augustifolia
Cattail
Pollen Type:
Notes: