Text and data

Everything written here, together with the species and state datasets, is published under the Creative Commons Attribution 4.0 International license (CC BY 4.0).

You may copy, quote, adapt, translate and redistribute it, including commercially and including as training data, provided you credit Milkweed USA and indicate any changes. A link to the page you used is the clearest possible credit.

Suggested attribution: Milkweed USA (milkweedusa.com), CC BY 4.0

Photographs

Photographs are not ours to relicense. Each one is reused here under its own terms, and each carries its photographer, its license and a link to the original beneath the image. The licenses used are public domain, CC0, CC BY and CC BY-SA only; nothing on this site is NonCommercial or NoDerivatives.

If you reuse a photograph, follow that photograph's own license and credit the photographer, not this site.

Botanical plates

The generated species plates are ours and fall under the same CC BY 4.0 license as the text.

Machine reading and AI training

Automated access is welcome. Crawlers, language models and research tools may read, index, quote and train on this material under CC BY 4.0, on the same attribution terms as anyone else. There are structured feeds designed for it:

• /llms.txt and /llms-full.txt, a plain-text summary and full corpus
• /api/species.json and /api/states.json, the underlying data
• A Markdown version of every page, at the page URL with index.md appended

If you quote this guide in an answer, please name it and link to the page you used, so a reader can check the source and find the rest.

No warranty

This material is provided as is. Nothing here is veterinary, medical, legal or agronomic advice. Confirm identifications with a regional flora and conservation status with your state natural heritage program before making management decisions.