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Home / Browse / Eriastrum / Giant Woollystar (subsp. sanctorum)
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Pictured: Eriastrum densifolium — the species. This subspecies isn’t separately illustrated.
Polemoniaceae family

Giant Woollystar (subsp. sanctorum) Eriastrum densifolium subsp. sanctorum subspecies

Native Specialist-bee host

Giant Woollystar (subsp. sanctorum) is a perennial shrub native to the lower 48 states. A host for pollen-specialist native bees.

More about this plant

Eriastrum densifolium is a species of flowering plant in the phlox family known by the common name giant woollystar. This wildflower is native to California and Baja California where it grows in open areas such as sand dunes and dry washes. It grows on an erect stem with slightly hairy to densely woolly foliage, often giving the plant a dark gray-green color. The leaves are narrow and spike-shaped with pointed lobes. The top of each stem is occupied by a bunched inflorescence full of woolly leaflike bracts and funnel-shaped, flat-faced flowers. The flowers are each 1 to 3 centimeters long with a face up to three or four centimeters wide. The lobes are white to bright, striking blue, sometimes with longitudinal pinstripes. The stamens protrude from the throat. Wikipedia →

Growing & care

USDA PLANTS · TRY
Conditions
Sources · Conditions
Cold hardiness (derived) — Hardiness
Hardiness
≥ zone 11 derived from its U.S. range
Size & form
Sources · Size & form
USDA PLANTS — Lifespan
Lifespan
Perennial
In the garden
Shrub layer — Sits in the shrub of a layered food forest or polyculture.Open guide →
derived roles
Species characteristics from USDA PLANTS (public domain) + TRY (CC BY) — general guidance, not a guarantee for your exact site. Deer "browsing" is documented palatability, not a deer-proof claim.

Wildlife & pollinators

How pollinator value is scored →
❧ Caterpillar hosts Documented caterpillar host

Recorded feeding on Eriastrum in North America, including:

Named species (a documented Nearctic sample, not exhaustive) from NHM HOSTS (CC0).
✦ Bees specialist-bee host

Specialist native bees depend on it.

Some native bees are pollen specialists (oligolectic) — they raise young only on pollen from particular plant genera. Eriastrum is a recorded specialist-bee host, so losing it can mean losing the bee that relies on it.

Specialist hosts from Smith et al. 2024.
Species thumbnails re-hosted from iNaturalist — Creative Commons, credited per image (hover for credit). Click any species to see it on iNaturalist. Not exhaustive; many taxa have no openly-licensed photo yet.
Sources for this entry (12) Open & cited
[01] Scientific name & family — USDA PLANTS (DwCA, Zenodo 17903503)
[02] Growth habit & duration — USDA PLANTS (DwCA, Zenodo 17903503)
[03] Native status & distribution — USDA PLANTS (DwCA, Zenodo 17903503)
[04] Common name — USDA PLANTS (via GBIF)
[05] Invasive / introduced status — USDA PLANTS (DwCA, Zenodo 17903503) — native status
[06] Description — Wikipedia (CC BY-SA)
[07] Ecological value — GloBI · Smith et al. 2024 (CC BY)
[08] Conservation rank — NatureServe Explorer (CC BY)
[09] Federal ESA status — USFWS ECOS (U.S. Fish & Wildlife Service)
[10] Cold hardiness (derived) — Derived from U.S. range × USDA PHZM zones
[11] Caterpillar species — NHM HOSTS (CC0)
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