# Tall Blacktip Ragwort (*senecio atratus*)

The Tall Blacktip Ragwort (Senecio atratus) is a striking perennial herb native to the high-elevation meadows and rocky slopes of the western United States. Growing robustly in the challenging alpine and subalpine zones, this member of the aster family stands out with its tall, leafy stems capped by clusters of vibrant yellow flower heads. It plays an important role in stabilizing loose montane soils and providing nectar to specialized alpine pollinators. Despite the harsh mountain winds and intense solar radiation, this resilient plant thrives where few others can, utilizing specialized chemical defenses to deter herbivores. Its presence adds a splash of brilliant color to the rugged, stone-filled landscapes of the Rocky Mountains. Naturalists and hikers often encounter it along high-altitude trails, where it serves as a beautiful indicator of a healthy, undisturbed montane ecosystem.

- **Category:** [Plants](https://www.snappit.app/explore/categories/plant)
- **Rarity:** Common
- **Danger:** 1/5 · Very low
- **Snaps:** 2
- **Habitat:** Typically found on high-elevation rocky slopes, talus fields, subalpine meadows, and open coniferous forests.

![Tall Blacktip Ragwort](https://inaturalist-open-data.s3.amazonaws.com/photos/403113698/medium.jpg)

Photo: Luke Padon, CC BY 4.0 · [iNaturalist](https://www.inaturalist.org/photos/403113698)

## Appearance

This species is a tall, erect perennial herb reaching 30 to 100 centimeters in height. Its sturdy, ribbed stems are leafy and may have sparse, woolly hairs when young. The leaves are broadly lance-shaped with coarsely toothed margins, often pale green to grayish-green. The defining visual characteristic is its dense, flat-topped clusters of narrow, cylindrical yellow flower heads. Each flower head is wrapped in a cup of green bracts (phyllaries) that feature distinct, starkly contrasting black tips. The flower heads mostly consist of disk florets, though a few short, inconspicuous yellow ray florets may sometimes be present at the outer edges.

## Taxonomy

- **Kingdom:** Plantae
- **Phylum:** Tracheophyta
- **Class:** Magnoliopsida
- **Order:** Asterales
- **Family:** Asteraceae
- **Genus:** Senecio

## Interesting facts

- It is incredibly hardy, often growing directly out of cracks in solid rock and scree fields above the tree line.
- The common name 'blacktip' refers to the distinct, charcoal-black tips on the bracts surrounding each flower head, resembling miniature painted matchsticks.
- The toxic alkaloids in this plant are preserved during drying, allowing picas to store them in haypiles where the toxins decay slowly, keeping the food fresh for winter.

## Special abilities

- **Pyrrolizidine Alkaloid Defense:** Produces toxic secondary metabolites that deter herbivores and insects from feeding on its foliage.
- **Woolly Insulation:** Features fine, woolly hairs on young leaves and stems to trap moisture and protect tissues from freezing alpine temperatures.
- **Soil-binding Taproot:** Develops a deep, sturdy taproot system that anchors the plant securely in unstable talus and rocky soils.

## Measurements & details

- **Length:** 30-100 cm
- **Lifespan:** 3-10 years
- **Clutch Size:** 100-1000
- **Incubation:** 14-30 days

## Diet & Feeding

As an autotrophic plant, it produces its own food through photosynthesis, converting sunlight, water, and carbon dioxide into sugars.

- **Primary Foods:** Sunlight, Carbon dioxide, Water, Soil nutrients

## Ecological connections

- **Mutualism:** Hunt Bumblebee (*Bombus huntii*) — Feeds on nectar and serves as a major pollinator for the flowers.
- **Eaten by:** American Pika (*Ochotona princeps*) — Harvests the plant for winter haypiles, utilizing the plant's toxic alkaloids as a natural preservative.

## Safety

**Danger:** 1/5 · Very low

No special safety notes yet.

## Frequently Asked Questions

### How to identify Tall Blacktip 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 Tall Blacktip Ragwort?

30-100 cm

### How long does Tall Blacktip Ragwort live?

3-10 years

### What does Tall Blacktip Ragwort eat?

As an autotrophic plant, it produces its own food through photosynthesis, converting sunlight, water, and carbon dioxide into sugars.

### Where is Tall Blacktip Ragwort usually found?

Typically found on high-elevation rocky slopes, talus fields, subalpine meadows, and open coniferous forests.

### How many eggs does Tall Blacktip Ragwort lay?

100-1000

### How long do Tall Blacktip Ragwort eggs take to hatch?

14-30 days

## Where to spot

- [Leadville Historic District](https://www.snappit.app/guides/places/leadville-historic-district) — Colorado, US · Historic District

## More Plants

- [white snakeroot](https://www.snappit.app/explore/white-snakeroot) (*Ageratina altissima*)
- [tree-of-heaven](https://www.snappit.app/explore/tree-of-heaven) (*Ailanthus altissima*)
- [western sword fern](https://www.snappit.app/explore/western-sword-fern) (*Polystichum munitum*)
- [common milkweed](https://www.snappit.app/explore/common-milkweed) (*Asclepias syriaca*)

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Source: [Tall Blacktip Ragwort: Facts & Places to See — Snappit](https://www.snappit.app/explore/tall-blacktip-ragwort)