Silphium simpsonii – Simpson’s Rosinweed

Silphium simpsonii – Simpson’s Rosinweed

Silphium simpsonii – Simpson’s Rosinweed

Silphium simpsonii – Simpson’s Rosinweed

Silphium simpsonii – Simpson’s Rosinweed

Silphium simpsonii – Simpson’s Rosinweed

Silphium simpsonii – Simpson’s Rosinweed

Silphium simpsonii – Simpson’s Rosinweed

Silphium simpsonii – Simpson’s Rosinweed

Silphium simpsonii – Simpson’s Rosinweed

Botanical Family Asteraceae

Bloom Time July – September

Pollen Characteristics

Dispersal Unit Monad

Aperture Number 3

Aperture Type Compound

Ornamentation Echinate

Tectum Semitectate

Size (um) 32

Shape Round

Pollen Color Reddish Yellow