--- { "id": "netseed-lambsquarters", "name": "Netseed lambsquarters", "scientific": "Chenopodium berlandieri", "category": "native", "status": "Native Colorado plant · not on state Lists A/B/C", "status_sources": [ "C-floristic-2020", "CO-rules-2025" ], "warning": "A fast-growing volunteer; pet toxicity remains unresolved", "warning_tone": "caution", "aliases": [ "netseed goosefoot" ], "taxonomy_note": "The Colorado flora assessment lists native Chenopodium berlandieri var. zschackii. This broader species profile does not identify every variety. It is separate from Chenopodium album; hazard claims for that species have not been transferred here.", "source_ids": [ "C-floristic-2020", "CO-rules-2025", "C-descriptions", "S27" ], "description": "Netseed lambsquarters: A fast-growing volunteer; pet toxicity remains unresolved. Identification and evidence for Colorado readers.", "claim_evidence": [ { "label": "Identification", "sources": [ "C-descriptions" ], "scope": "Species description; identification limitation", "note": "", "id": "netseed-lambsquarters-1" }, { "label": "People", "sources": [], "scope": "Review limitation", "note": "", "id": "netseed-lambsquarters-2" }, { "label": "Dogs & cats", "sources": [], "scope": "Review limitation", "note": "", "id": "netseed-lambsquarters-3" }, { "label": "Other animals", "sources": [], "scope": "Review limitation", "note": "", "id": "netseed-lambsquarters-4" }, { "label": "Plants & habitat", "sources": [ "C-descriptions" ], "scope": "Species-specific", "note": "", "id": "netseed-lambsquarters-5" }, { "label": "Management & timing", "sources": [ "C-descriptions" ], "scope": "Species-specific", "note": "", "id": "netseed-lambsquarters-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": "People", "question": "Clarify the human exposure effects and evidence limits described in this section.", "related_claim_ids": [ "netseed-lambsquarters-2" ] }, { "area": "Dogs & cats", "question": "Find species-specific dog and cat exposure evidence; do not infer safety from missing reports.", "related_claim_ids": [ "netseed-lambsquarters-3" ] }, { "area": "Other animals", "question": "Clarify feeding and exposure risks for each animal group; do not transfer findings between species.", "related_claim_ids": [ "netseed-lambsquarters-4" ] }, { "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 44; Chenopodium berlandieri", "basis": "Included in the 2020 statewide flora assessment. This is not a current county abundance survey.", "source_taxon": "Chenopodium berlandieri" }, "source": "content/plants/netseed-lambsquarters.md" } --- # Netseed lambsquarters *Chenopodium berlandieri* **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) > **A fast-growing volunteer; pet toxicity remains unresolved.** [Exposure help](https://denson.github.io/colorado-weed-field-guide/safety/). **Identification caveat:** The Colorado flora assessment lists native Chenopodium berlandieri var. zschackii. This broader species profile does not identify every variety. It is separate from Chenopodium album; hazard claims for that species have not been transferred here. ## Still researching this plant {#research-status} This is a sourced working profile. Evidence is incomplete for **People, Dogs & cats, Other animals**. 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. ![Pitseed goosefoot: a small upright leafy goosefoot plant growing among stones in open ground.](https://denson.github.io/colorado-weed-field-guide/assets/photos/coverage-garden-photos-chenopodium-berlandieri-03-03-habit.jpg) **habit** — A small upright leafy goosefoot plant growing among stones in open ground. Photo: Matt Lavin; [CC BY-SA 2.0](https://creativecommons.org/licenses/by-sa/2.0); [source record](https://commons.wikimedia.org/wiki/File:Chenopodium_berlandieri_(3767481167).jpg); [original image](https://upload.wikimedia.org/wikipedia/commons/7/7e/Chenopodium_berlandieri_%283767481167%29.jpg). Source page scientific identification plus visual morphology review of the selected photograph. This is a source-identified reference image, not a specimen-based taxonomic determination. Source-identified C. berlandieri. Goosefoot species and infraspecific taxa can be difficult to distinguish, and mature seed surface characters may be needed. Foliage photographs alone do not establish an unknown plant’s species or variety; mixed Atriplex/Chenopodium comparison scenes were excluded. Wikimedia server-resized derivative, reduced from the original; no crop, color change, upscaling, or generative editing. Gallery display preserves the full image; catalog preview may use a CSS crop. ![Pitseed goosefoot: close view of a pale green, irregularly toothed leaf with a mealy-looking surface.](https://denson.github.io/colorado-weed-field-guide/assets/photos/coverage-garden-photos-chenopodium-berlandieri-03-07-leaf.jpg) **leaf** — Close view of a pale green, irregularly toothed leaf with a mealy-looking surface. Photo: Matt Lavin; [CC BY-SA 2.0](https://creativecommons.org/licenses/by-sa/2.0); [source record](https://commons.wikimedia.org/wiki/File:Chenopodium_berlandieri_(3767482897).jpg); [original image](https://upload.wikimedia.org/wikipedia/commons/d/d6/Chenopodium_berlandieri_%283767482897%29.jpg). Source page scientific identification plus visual morphology review of the selected photograph. This is a source-identified reference image, not a specimen-based taxonomic determination. Source-identified C. berlandieri. Goosefoot species and infraspecific taxa can be difficult to distinguish, and mature seed surface characters may be needed. Foliage photographs alone do not establish an unknown plant’s species or variety; mixed Atriplex/Chenopodium comparison scenes were excluded. Wikimedia server-resized derivative, reduced from the original; no crop, color change, upscaling, or generative editing. Gallery display preserves the full image; catalog preview may use a CSS crop. ![Pitseed goosefoot: close view of crowded green reproductive clusters beside a branching yellow-green stem.](https://denson.github.io/colorado-weed-field-guide/assets/photos/coverage-garden-photos-chenopodium-berlandieri-03-11-reproductive-clusters.jpg) **reproductive-clusters** — Close view of crowded green reproductive clusters beside a branching yellow-green stem. Photo: Matt Lavin; [CC BY-SA 2.0](https://creativecommons.org/licenses/by-sa/2.0); [source record](https://commons.wikimedia.org/wiki/File:Chenopodium_berlandieri_(5133107546).jpg); [original image](https://upload.wikimedia.org/wikipedia/commons/1/19/Chenopodium_berlandieri_%285133107546%29.jpg). Source page scientific identification plus visual morphology review of the selected photograph. This is a source-identified reference image, not a specimen-based taxonomic determination. Source-identified C. berlandieri. Goosefoot species and infraspecific taxa can be difficult to distinguish, and mature seed surface characters may be needed. Foliage photographs alone do not establish an unknown plant’s species or variety; mixed Atriplex/Chenopodium comparison scenes were excluded. Wikimedia server-resized derivative, reduced from the original; no crop, color change, upscaling, or generative editing. Gallery display preserves the full image; catalog preview may use a CSS crop. ## Identification An annual with variable leaves, a mealy underside and grooved stems; green flowers are inconspicuous. Confirm mature seed characters before separating it from common lambsquarters. [C-descriptions](https://extension.colostate.edu/resource/weed-descriptions/) *Evidence scope: Species description; identification limitation.* ## People The reviewed sources do not establish species-specific ingestion effects or a safe exposure amount for people. Missing evidence does not establish safety. ## Dogs & cats The reviewed sources do not establish species-specific ingestion effects or a safe exposure amount for dogs or cats. Missing evidence does not establish safety. ## Other animals The reviewed sources do not establish species-specific ingestion effects or a safe exposure amount for livestock. Missing evidence does not establish safety. ## Plants & habitat Rapid growth and water use can make it competitive in cultivated ground. [C-descriptions](https://extension.colostate.edu/resource/weed-descriptions/) ## Management & timing Pull or hoe young plants and prevent seed maturation where they are unwanted. [C-descriptions](https://extension.colostate.edu/resource/weed-descriptions/) ## 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. - **C-descriptions** — [Weed descriptions](https://extension.colostate.edu/resource/weed-descriptions/), Colorado State University Extension. Accessed 2026-09-07T00:24:02+00:00. Locator: Species entries. - **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=netseed-lambsquarters) — 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 44; Chenopodium berlandieri. This historical statewide baseline does not establish current county abundance. ## Open research questions - **People:** Clarify the human exposure effects and evidence limits described in this section. - **Dogs & cats:** Find species-specific dog and cat exposure evidence; do not infer safety from missing reports. - **Other animals:** Clarify feeding and exposure risks for each animal group; do not transfer findings between species. - **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 The Colorado flora assessment lists native Chenopodium berlandieri var. zschackii. This broader species profile does not identify every variety. It is separate from Chenopodium album; hazard claims for that species have not been transferred here. 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 | |---|---|---|---|---| | netseed-lambsquarters-1 | Identification | Species description; identification limitation | C-descriptions | No quantitative safe exposure established here. | | netseed-lambsquarters-2 | People | Review limitation | Review limitation | No quantitative safe exposure established here. | | netseed-lambsquarters-3 | Dogs & cats | Review limitation | Review limitation | No quantitative safe exposure established here. | | netseed-lambsquarters-4 | Other animals | Review limitation | Review limitation | No quantitative safe exposure established here. | | netseed-lambsquarters-5 | Plants & habitat | Species-specific | C-descriptions | No quantitative safe exposure established here. | | netseed-lambsquarters-6 | Management & timing | Species-specific | C-descriptions | 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/netseed-lambsquarters/ Content revised: 2026-09-07T02:46:00Z Markdown mirror: https://denson.github.io/colorado-weed-field-guide/plants/netseed-lambsquarters/index.md Text fallback: https://denson.github.io/colorado-weed-field-guide/plants/netseed-lambsquarters/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