Texas Ragwort

senecio ampullaceus

The Texas Ragwort, also known as Texas Groundsel, is a vibrant annual wildflower endemic to the sandy soils of Texas and surrounding regions. Emerging in early spring, it blankets fields, open woodlands, and roadsides in a stunning sheet of golden-yellow blooms. This resilient plant is well-adapted to the well-drained, sandy environments of the Gulf Coast and post oak savannahs, providing an essential early-season food source for local pollinators when few other plants are in bloom. While beautiful, the plant contains toxic compounds that protect it from most mammalian herbivores, allowing it to thrive undisturbed in pastures. It stands as a classic symbol of the Texan spring landscape, heralding the end of winter with its brilliant, cheerful color.

Habitat: Typically found in open sandy areas, post oak savannahs, prairies, and disturbed roadsides.

Appearance

Texas Ragwort typically grows between 20 to 80 centimeters tall, featuring single or clustered upright stems. It is easily identified by its soft, fleshy, bluish-green leaves that clasp the stem directly, with the lower leaves being larger and more oval-shaped. The flowering heads are clustered at the top of the stem, each boasting a bright yellow central disk surrounded by 8 to 15 matching yellow ray petals. Before opening, the flower buds exhibit a distinctive, slightly swollen flask-like shape, which gives the species its scientific name.

KingdomPlantaePhylumTracheophytaClassMagnoliopsidaOrderAsteralesFamilyAsteraceaeGenusSenecio

Photo: Laura ClarkCC BY 4.0 · iNaturalistView original ↗

Texas Ragwort

Interesting facts

Despite being toxic to livestock, it is highly beneficial to native bees and butterflies as an early-season nectar source.

It is a true regional specialty, being almost entirely restricted to the state of Texas.

The species name 'ampullaceus' comes from the Latin word for flask, referring to the flask-shaped buds of the plant.

Special abilities

Produces pyrrolizidine alkaloids that are highly toxic to liver cells, deterring grazing mammals like cattle and horses from consuming it.

Blooms rapidly in early spring, capitalizing on early-season moisture and avoiding competition with later-emerging summer plants.

Utilizes a specialized taproot system to anchor firmly and extract moisture from fast-draining, nutrient-poor sandy soils.

Measurements & details

Length: 20-80 cm
Lifespan: 1 years

Diet & Feeding

As an autotrophic plant, Texas Ragwort creates its own energy through photosynthesis, using sunlight, water, and atmospheric carbon dioxide.

Primary Foods

Sunlight
Water
Carbon Dioxide
Soil Nutrients

Ecological connections

Mutualism

American Bumblebee

Bombus pensylvanicus

Feeds on the nectar and pollen, acting as a major early-season pollinator.

Mutualism

Monarch Butterfly

Danaus plexippus

Utilizes the abundant spring blooms as a crucial energy source during its spring migration.

Eaten by

White-tailed Deer

Odocoileus virginianus

Occasionally browses the young foliage, though generally avoids older toxic leaves.

Traits

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Also known as

No aliases listed yet.

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Safety

Danger

1/5 · Very low

No special safety notes yet.

Frequently Asked Questions

How to identify Texas Ragwort?

Start with the whole plant, then compare leaf arrangement, leaf edges, stems and any flowers or fruit. Opposite leaves grow in pairs; alternate leaves come one at a time along the stem. These details tell you far more together than a single green leaf does. Plant Identifier: upload a photo and compare the visible details.

How long is Texas Ragwort?

20-80 cm

How long does Texas Ragwort live?

1 years

What does Texas Ragwort eat?

As an autotrophic plant, Texas Ragwort creates its own energy through photosynthesis, using sunlight, water, and atmospheric carbon dioxide.

Where is Texas Ragwort usually found?

Typically found in open sandy areas, post oak savannahs, prairies, and disturbed roadsides.