North America Native Plant

Lucy Braun’s Rosinweed

Botanical name: Silphium terebinthinaceum var. luciaebrauniae

USDA symbol: SITEL2

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Lucy Braun’s Rosinweed: A Rare Native Prairie Gem Worth Protecting If you’re passionate about native plants and conservation, Lucy Braun’s rosinweed (Silphium terebinthinaceum var. luciaebrauniae) might just capture your heart – though you’ll need to be patient and responsible in your pursuit of this botanical treasure. This rare variety of ...

Rare plant alert!

Region: Conservation status by state

Status: S4S5T3?Q: Status is uncertain but is somewhere between the following rankings: Inexact rank: ⚘ Uncertain taxonomy: ⚘ Subspecies or variety is vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals. ⚘ Apparently Secure: Uncommon but not rare, and usually widespread. Possibly cause for longterm concern. Typically more than 100 occurrences in the state or more than 10,000 individuals ⚘ Secure: At very low or no risk of extinction in the jurisdiction due to a very extensive range, abundant populations or occurrences, with little to no concern from declines or threats. ⚘

Lucy Braun’s Rosinweed: A Rare Native Prairie Gem Worth Protecting

If you’re passionate about native plants and conservation, Lucy Braun’s rosinweed (Silphium terebinthinaceum var. luciaebrauniae) might just capture your heart – though you’ll need to be patient and responsible in your pursuit of this botanical treasure. This rare variety of the beloved Prairie Dock is named after Lucy Braun, a pioneering botanist who dedicated her life to studying and preserving America’s native flora.

What Makes This Plant Special

Lucy Braun’s rosinweed is a perennial forb, meaning it’s an herbaceous plant that lacks woody stems and returns year after year from its root system. As part of the Silphium family, it’s related to other prairie stalwarts known for their robust nature and ecological importance. This particular variety represents a unique piece of our native plant heritage, found only in select areas across Illinois, Kentucky, Mississippi, and Ohio.

A Conservation Concern

Here’s where things get serious: Lucy Braun’s rosinweed has a Global Conservation Status that suggests rarity and potential concern for its long-term survival. This isn’t a plant you’ll find at your typical garden center, and that’s probably for the best. If you’re interested in growing this remarkable variety, it’s absolutely crucial that you source it responsibly from reputable native plant societies or conservation-focused nurseries that can verify its provenance.

Why Consider This Plant for Your Garden

While specific information about this variety’s garden characteristics is limited, its rarity makes it a meaningful addition for serious native plant enthusiasts who want to contribute to conservation efforts. By growing Lucy Braun’s rosinweed in your garden, you’re essentially creating a living seed bank and helping preserve a piece of our natural heritage.

As a native forb, it likely shares many characteristics with its parent species, potentially offering:

  • Deep prairie roots that improve soil health
  • Drought tolerance once established
  • Potential wildlife benefits typical of Silphium species
  • A connection to authentic prairie ecosystems

Growing Conditions and Care

Since specific growing information for this variety is limited, gardeners should approach cultivation with the understanding that this plant likely prefers conditions similar to other prairie species. However, given its rarity, it’s essential to:

  • Only obtain plants or seeds from verified, ethical sources
  • Never collect from wild populations
  • Consider participating in seed exchange programs with botanical gardens or native plant societies
  • Document your growing experience to contribute to our knowledge of this rare variety

The Responsible Gardener’s Approach

If you’re drawn to Lucy Braun’s rosinweed, consider it a long-term conservation project rather than a typical garden addition. Connect with local native plant societies, botanical gardens, or universities that might have cultivation programs for rare species. They may be able to guide you toward legitimate sources or even involve you in conservation efforts.

Alternatively, while you search for this rare variety, consider growing the more readily available parent species or other native Silphium varieties. They’ll provide similar ecological benefits and help you develop the skills needed to successfully cultivate these magnificent prairie plants.

A Living Legacy

Lucy Braun devoted her career to understanding and protecting native plants, and this rosinweed variety bearing her name represents that same spirit of conservation. By growing it responsibly, you’re not just adding a plant to your garden – you’re participating in the preservation of biodiversity and honoring the legacy of one of America’s great botanists.

Remember, with rare plants comes great responsibility. If you’re fortunate enough to grow Lucy Braun’s rosinweed, consider yourself a conservation steward, tasked with protecting and potentially propagating this special variety for future generations of both gardeners and native ecosystems.

Lucy Braun’s Rosinweed

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Asterales

Family

Asteraceae Bercht. & J. Presl - Aster family

Genus

Silphium L. - rosinweed

Species

Silphium terebinthinaceum Jacq. - prairie rosinweed

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA