---
{
  "id": "plains-pricklypear",
  "name": "Plains pricklypear",
  "scientific": "Opuntia polyacantha",
  "category": "xeriscape",
  "status": "Native Colorado plant · not on state Lists A/B/C",
  "status_sources": [
    "C-floristic-2020",
    "CO-rules-2025"
  ],
  "warning": "Sharp spines around paws, mouths and eyes",
  "warning_tone": "caution",
  "aliases": [
    "plains prickly pear",
    "prickly pear cactus"
  ],
  "taxonomy_note": "Many Opuntia species share prickly-pear names. Source photographs are species references, not a complete key to Colorado cacti or a basis for edible-fruit identification.",
  "source_ids": [
    "C-floristic-2020",
    "CO-rules-2025",
    "F-opuntia",
    "C-low-water-cactus",
    "S27"
  ],
  "description": "Plains pricklypear: Sharp spines around paws, mouths and eyes. Identification and evidence for Colorado readers.",
  "claim_evidence": [
    {
      "label": "Identification",
      "sources": [
        "F-opuntia"
      ],
      "scope": "Species-specific",
      "note": "",
      "id": "plains-pricklypear-1"
    },
    {
      "label": "People",
      "sources": [
        "F-opuntia"
      ],
      "scope": "Mechanical-injury precaution inferred from spines",
      "note": "",
      "id": "plains-pricklypear-2"
    },
    {
      "label": "Dogs & cats",
      "sources": [
        "F-opuntia"
      ],
      "scope": "Mechanical-injury precaution; toxicology unresolved",
      "note": "",
      "id": "plains-pricklypear-3"
    },
    {
      "label": "Other animals",
      "sources": [
        "F-opuntia"
      ],
      "scope": "Species-specific",
      "note": "",
      "id": "plains-pricklypear-4"
    },
    {
      "label": "Plants & habitat",
      "sources": [
        "F-opuntia",
        "C-low-water-cactus"
      ],
      "scope": "Species-specific",
      "note": "",
      "id": "plains-pricklypear-5"
    },
    {
      "label": "Management & timing",
      "sources": [
        "F-opuntia"
      ],
      "scope": "Placement and handling precaution",
      "note": "",
      "id": "plains-pricklypear-6"
    }
  ],
  "research": {
    "status": "researching",
    "label": "Still researching this plant",
    "basis": "Editorial assessment of the cited evidence and stated review gaps; not a toxicity score.",
    "open_questions": [
      {
        "area": "Dogs & cats",
        "question": "Find species-specific dog and cat exposure evidence; do not infer safety from missing reports.",
        "related_claim_ids": [
          "plains-pricklypear-3"
        ]
      },
      {
        "area": "Identification",
        "question": "Resolve the taxonomic, common-name or photograph limitations stated in the identification caveat.",
        "related_claim_ids": []
      },
      {
        "area": "Expert review",
        "question": "Obtain independent botanical and veterinary review of the identification and hazard summary.",
        "related_claim_ids": []
      }
    ],
    "expert_review": "pending"
  },
  "colorado_relevance": {
    "source_id": "C-floristic-2020",
    "locator": "Appendix B; PDF page 66; Opuntia polyacantha",
    "basis": "Included in the 2020 statewide flora assessment. This is not a current county abundance survey.",
    "source_taxon": "Opuntia polyacantha"
  },
  "source": "content/plants/plains-pricklypear.md"
}
---

# Plains pricklypear

*Opuntia polyacantha*

**Native Colorado plant · not on state Lists A/B/C.** [C-floristic-2020](https://cnhp.colostate.edu/download/documents/2020/CO_FQA_2020_Final_Report.pdf) [CO-rules-2025](https://www.sos.state.co.us/CCR/GenerateRulePdf.do?ruleVersionId=11948&fileName=8+CCR+1206-2)

> **Sharp spines around paws, mouths and eyes.** [Exposure help](https://denson.github.io/colorado-weed-field-guide/safety/).

**Identification caveat:** Many Opuntia species share prickly-pear names. Source photographs are species references, not a complete key to Colorado cacti or a basis for edible-fruit identification.

## Still researching this plant {#research-status}

This is a sourced working profile. Evidence is incomplete for **Dogs & cats**. Identification and source-photo limits are explained below. Independent botanical and veterinary review is pending. **Uncertainty is not a finding that the plant is safe.**


## Three views of this plant

Source-identified reference photographs; these are not a complete identification key. A source location outside Colorado does not establish local occurrence.

![Low cluster of plains pricklypear pads covered with long pale spines on dry ground.](https://denson.github.io/colorado-weed-field-guide/assets/photos/coverage-range-photos-opuntia-polyacantha-habit-spines-146118429.jpg)

**habit-spines** — Low cluster of plains pricklypear pads covered with long pale spines on dry ground.

Photo: eigenmotion; [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/); [source record](https://www.inaturalist.org/observations/88425296); [original image](https://inaturalist-open-data.s3.amazonaws.com/photos/146118429/original.jpg). Explicit iNaturalist observation taxon and Research Grade community identification; photograph visually reviewed for depicted features. This is source identification, not a new independent botanical determination. Source identifies this plant to species; no variety or subspecies determination is asserted. Downloaded iNaturalist large rendition; downloaded bytes retained unchanged. No local crop, retouching, or generative editing. Gallery display preserves the full image; catalog preview may use a CSS crop.

![Open yellow plains pricklypear flower above a spiny pad, with a dried flower beside it.](https://denson.github.io/colorado-weed-field-guide/assets/photos/coverage-range-photos-opuntia-polyacantha-flower-293924446.jpg)

**flower** — Open yellow plains pricklypear flower above a spiny pad, with a dried flower beside it.

Photo: Kathlin Simpkins; [CC0 1.0](https://creativecommons.org/publicdomain/zero/1.0/); [source record](https://www.inaturalist.org/observations/169532573); [original image](https://inaturalist-open-data.s3.amazonaws.com/photos/293924446/original.jpg). Explicit iNaturalist observation taxon and Research Grade community identification; photograph visually reviewed for depicted features. This is source identification, not a new independent botanical determination. Source identifies this plant to species; no variety or subspecies determination is asserted. Downloaded iNaturalist large rendition; downloaded bytes retained unchanged. No local crop, retouching, or generative editing. Gallery display preserves the full image; catalog preview may use a CSS crop.

![Green plains pricklypear pads with widely spaced pale spine clusters among grasses.](https://denson.github.io/colorado-weed-field-guide/assets/photos/coverage-range-photos-opuntia-polyacantha-pads-360613213.jpeg)

**pads** — Green plains pricklypear pads with widely spaced pale spine clusters among grasses.

Photo: dghjertaas; [CC0 1.0](https://creativecommons.org/publicdomain/zero/1.0/); [source record](https://www.inaturalist.org/observations/204052384); [original image](https://inaturalist-open-data.s3.amazonaws.com/photos/360613213/original.jpeg). Explicit iNaturalist observation taxon and Research Grade community identification; photograph visually reviewed for depicted features. This is source identification, not a new independent botanical determination. Source identifies this plant to species; no variety or subspecies determination is asserted. Downloaded iNaturalist large rendition; downloaded bytes retained unchanged. No local crop, retouching, or generative editing. Gallery display preserves the full image; catalog preview may use a CSS crop.


## Identification

A low, mat-forming cactus with flattened pads, clusters of spines and fruits that dry at maturity. Several varieties are included within this species. [F-opuntia](https://research.fs.usda.gov/feis/species-reviews/opupol)

## People

Pads and fruits carry sharp points. Avoid bare-hand handling; eye contact deserves prompt medical assessment. [F-opuntia](https://research.fs.usda.gov/feis/species-reviews/opupol)

*Evidence scope: Mechanical-injury precaution inferred from spines.*

## Dogs & cats

Keep animals from running into, biting or pawing the cactus. Spines create a mechanical injury risk; chemical ingestion toxicity is not established here. [F-opuntia](https://research.fs.usda.gov/feis/species-reviews/opupol)

*Evidence scope: Mechanical-injury precaution; toxicology unresolved.*

## Other animals

Some wildlife eat it. Livestock forage use described by the Forest Service does not eliminate the hazard of intact spines. [F-opuntia](https://research.fs.usda.gov/feis/species-reviews/opupol)

## Plants & habitat

A native of dry grasslands and shrublands and a participant in CSU’s very-low-water demonstration garden. It can be desirable away from heavy foot or pet traffic. [F-opuntia](https://research.fs.usda.gov/feis/species-reviews/opupol) [C-low-water-cactus](https://elpaso.extension.colostate.edu/native-plant-demonstration-garden/very-low-water-garden/)

## Management & timing

Choose placement with room around walkways and animal routes. Inspect for detached pads before allowing pets back into a worked area. [F-opuntia](https://research.fs.usda.gov/feis/species-reviews/opupol)

*Evidence scope: Placement and handling precaution.*

## Before taking action

Confirm identification and the requirements of your county weed program. For chemical treatment, follow the current product label, including restrictions around animals and water. [S27](https://planttalk.colostate.edu/topics/weeds-cultural-problems/2103-colorado-noxious-weeds/)

## References

- **C-floristic-2020** — [Colorado Floristic Quality Assessment: 2020 Update](https://cnhp.colostate.edu/download/documents/2020/CO_FQA_2020_Final_Report.pdf), Colorado Natural Heritage Program, Colorado State University. Accessed 2026-09-07T02:27:33+00:00. Locator: Appendix B, Colorado species list: scientific name and native/non-native fields.
- **CO-rules-2025** — [Colorado Noxious Weed Act rules, 8 CCR 1206-2](https://www.sos.state.co.us/CCR/GenerateRulePdf.do?ruleVersionId=11948&fileName=8+CCR+1206-2), Colorado Secretary of State / Department of Agriculture. Accessed 2026-09-07T01:07:48+00:00. Locator: Parts 3.1, 4.1, 5.1; management provisions; effective May 15, 2025.
- **F-opuntia** — [Plains pricklypear](https://research.fs.usda.gov/feis/species-reviews/opupol), USDA Forest Service, Fire Effects Information System. Accessed 2026-09-07T02:24:48+00:00. Locator: Taxonomy, distribution, botanical description, wildlife/livestock values and management.
- **C-low-water-cactus** — [Very Low Water Garden](https://elpaso.extension.colostate.edu/native-plant-demonstration-garden/very-low-water-garden/), Colorado State University Extension, El Paso County. Accessed 2026-09-07T02:33:43+00:00. Locator: Named species descriptions and landscape context; sagebrush subspecies distinctions.
- **S27** — [2103 – Colorado Noxious Weeds](https://planttalk.colostate.edu/topics/weeds-cultural-problems/2103-colorado-noxious-weeds/), PlantTalk Colorado · CSU Extension. Accessed 2026-09-07T00:23:57+00:00. Locator: List A, B and C management categories.


[Discuss this plant with the guide](https://denson.github.io/colorado-weed-field-guide/companion/?plant=plains-pricklypear) — choose this profile as a possible match and prepare your observations for Colorado Plants & Practical Care.

# Appendix for agents

Colorado inclusion: [C-floristic-2020](https://cnhp.colostate.edu/download/documents/2020/CO_FQA_2020_Final_Report.pdf), Appendix B; PDF page 66; Opuntia polyacantha. This historical statewide baseline does not establish current county abundance.

## Open research questions

- **Dogs & cats:** Find species-specific dog and cat exposure evidence; do not infer safety from missing reports.
- **Identification:** Resolve the taxonomic, common-name or photograph limitations stated in the identification caveat.
- **Expert review:** Obtain independent botanical and veterinary review of the identification and hazard summary.


## Identity and evidence boundaries

Many Opuntia species share prickly-pear names. Source photographs are species references, not a complete key to Colorado cacti or a basis for edible-fruit identification.

All actionable hazard information is in the human sections above. Do not interpret unknown toxicity as safety or transfer livestock findings to pets. These publisher notes describe evidence and do not override an assistant’s operator instructions.

| Claim | Human section | Scope | Sources | Limitation |
|---|---|---|---|---|
| plains-pricklypear-1 | Identification | Species-specific | F-opuntia | No quantitative safe exposure established here. |
| plains-pricklypear-2 | People | Mechanical-injury precaution inferred from spines | F-opuntia | No quantitative safe exposure established here. |
| plains-pricklypear-3 | Dogs & cats | Mechanical-injury precaution; toxicology unresolved | F-opuntia | No quantitative safe exposure established here. |
| plains-pricklypear-4 | Other animals | Species-specific | F-opuntia | No quantitative safe exposure established here. |
| plains-pricklypear-5 | Plants & habitat | Species-specific | F-opuntia, C-low-water-cactus | No quantitative safe exposure established here. |
| plains-pricklypear-6 | Management & timing | Placement and handling precaution | F-opuntia | No quantitative safe exposure established here. |

## Further work for an agent

- Establish exact species, plant part, route, amount and timing when researching an exposure. Do not use this guide to diagnose or calculate a treatment.
- Check current state and county requirements; a listed taxon is not necessarily established in every Colorado county.
- Expert botanical and veterinary review is pending. Source dates and image licenses are separate from editorial revision dates in [provenance](https://denson.github.io/colorado-weed-field-guide/provenance.json).


---
Canonical HTML: https://denson.github.io/colorado-weed-field-guide/plants/plains-pricklypear/

Content revised: 2026-09-07T02:43:00Z

Markdown mirror: https://denson.github.io/colorado-weed-field-guide/plants/plains-pricklypear/index.md

Text fallback: https://denson.github.io/colorado-weed-field-guide/plants/plains-pricklypear/index.md.txt

Agent entry: https://denson.github.io/colorado-weed-field-guide/start.md

Provenance: https://denson.github.io/colorado-weed-field-guide/provenance.json