Simpson's Rosinweed Pollen Color

Silphium asteriscus var. simpsonii

Simpson's Rosinweed pollen is shown in the orange and amber color family as general visual guidance. Use this page as a reference for pollen appearance, bloom timing, plant type, bee forage value, and available hardiness context.

Pollen color is highly variable. Lighting, pollen age, moisture, collection method, cultivar, and local growing conditions can all change how pollen appears. Use this as general visual guidance, not a scientific color standard or guaranteed field match.

Visual guideSimpson's Rosinweed pollen

No verified flowering image is currently available.

Plant Facts

SeasonSummer to Fall
USDA Zone7 - 10
Plant TypeWildflower
ForagePollen and nectar
Pollen ValueLow
Nectar ValueLow
Color FamilyOrange and amber
Scientific NameSilphium asteriscus var. simpsonii
Common NamesSimpson's rosinweed, Simpson rosinweed
Native RegionsFlorida, Southeastern United States
Range StatusA southeastern United States rosinweed variety associated especially with Florida.
Color ConfidenceModerate
Color MethodA taxon-level pollen-library record under the older name Silphium simpsonii describes the pollen as reddish yellow; the digital swatch is approximate.
Reviewed2026-10-11

Quick Answer

Simpson's Rosinweed pollen is shown in this guide as an orange and amber tone. It is listed as wildflower, associated with summer to fall bloom timing, USDA zone 7 - 10, and pollen and nectar forage value.

Pollen Color Notes

The visual color shown for Simpson's Rosinweed is grouped broadly with orange and amber pollen tones. It is intended for comparison and identification support, not as a laboratory measurement.

Pollen color is highly variable. Lighting, pollen age, moisture, collection method, cultivar, and local growing conditions can all change how pollen appears. Use this as general visual guidance, not a scientific color standard or guaranteed field match.

Bloom, Zone, and Forage Context

Simpson's Rosinweed is listed for summer to fall. The record lists USDA zone 7 - 10; hardiness zones are planning context, not a precise flowering calendar. Approximate bloom months in the supplemental notes: July, August, September.

Its forage type is pollen and nectar, with pollen value marked as low and nectar value marked as low. Flower heads provide pollen and nectar to bees and other summer pollinators, although forage strength is not quantified in the color source.

Identification Notes

Simpson's rosinweed is a tall perennial with rough leaves and yellow composite flower heads; current treatments place it within Silphium asteriscus as variety simpsonii.

Flower color note: Yellow. Flower color and pollen color may differ.

Related by Similar Color

Purple Prairie Clover - Orange and amber Yellow Sweet Clover - Orange and amber Honey Locust - Orange and amber Carolina Silverbell - Orange and amber Rough Oxeye - Orange and amber Spanish Needles - Orange and amber

Related by Season

Alfalfa - Summer to Fall Balsam - Summer to Fall Black-eyed Susan - Summer to Fall Blue Vervain - Summer to Fall Boneset - Summer to Fall Buddleia - Summer to Fall

Related by Plant Type

Alfalfa - Wildflower Aster - Wildflower Balsam - Wildflower Bee Balm - Wildflower Bindweed - Wildflower Bird's-Foot Trefoil - Wildflower

Related by USDA Zone

Adam's Needle - Zone 4 - 10 Alder - Zone 2 - 7 Allium - Zone 3 - 9 Almond - Zone 4 - 8 Alsike Clover - Zone 3 - 8 American Basswood - Zone 3 - 8

Related by Bee Forage

Adam's Needle - Pollen and nectar Alfalfa - Pollen and nectar Allium - Pollen and nectar Almond - Pollen and nectar Alsike Clover - Pollen and nectar American Basswood - Pollen and nectar

Sources

USDA Plant Hardiness Zone Map
United States Department of Agriculture / reviewed 2026-07-12
USDA hardiness zone context USDA PLANTS Database
United States Department of Agriculture / reviewed 2026-07-12
scientific name, common name, distribution context, plant classification The Anther's Promise pollen library
The Anther's Promise / reviewed 2026-10-11
pollen color category, bloom period, pollen morphology, bee resource context Flora of Florida (Franck 2026)
Florida Museum of Natural History / reviewed 2026-10-11
current Florida plant taxonomy, scientific name, regional flora context Selecting Plants for Pollinators regional guides
Pollinator Partnership / reviewed 2026-10-11
North American regional plant selection, native range context, bloom timing, pollinator value Wikipedia and Wikimedia Commons
Wikimedia Foundation contributors / reviewed 2026-07-12
plant image, image credit link