It’s frustrating to me that people are exclusively testing these ideas with ChatGPT, as it’s only one of a number of LLM options, one which doesn’t typically live reference the internet to augment its training data, and which obviously wasn’t trained with obscure organism identification in mind.
When I ask an LLM for ID help I usually use Perplexity as it’s better suited to this task. It references internet resources and includes photos and links from those resources so you can double check its answers. It’s also less likely to make up information that it can’t find in the internet sources.
In this case, it assumed that T. grayi existed based on it being included in the question, but said it couldn’t find any information about it. I think that’s a fair response, theoretically some additional prompting advice on species ID could get it to more consistently state that a species may not exist at all if it’s not mentioned anywhere on the internet.
Neither of these LLMs are representative of what anything on iNat might be like; my point is to emphasize that there is a wide variety of LLM use cases out there and any specific example likely won’t be a good comparison.
Full response in spoilers:
Perplexity AI: How do you tell the difference between Thaspium grayi and Thaspium chapmanii
To distinguish between Thaspium grayi and Thaspium chapmanii, it is important to note that detailed direct comparisons between these two species are not extensively documented in the search results. However, there is useful information on Thaspium chapmanii and its close relatives that can help infer differences.
Thaspium chapmanii is characterized by:
- Taller, more branched plants with more divided leaves (cauline leaves 2–3 ternate).
- Leaflets with coarsely serrate margins.
- Leaves typically pubescent on the underside (abaxially) with hairs on the lamina and veins.
- Pale yellow to creamy white corollas.
- Peduncles and umbel rays that are scabrellous (bearing small, sharp projections) on the upper surface.
- Smaller mature fruits (4–5 mm long), minutely spinulose to scabrellous between the wings.
- Habitat preferences include glade edges, bluff tops, prairies, rocky banks, stream floodplains, and open woodlands.
- Flowering peaks later (late May through June).
Thaspium barbinode, a close relative often compared with T. chapmanii, differs by having:
- Less divided leaves (cauline leaves 1–2 ternate).
- Golden yellow corollas.
- Peduncles and umbel rays glabrous or papillose-roughened (with blunt projections).
- Larger fruits (5–6 mm long), glabrous or rarely scabrellous.
- More mesic habitats like wooded bluffs and springheads.
- Earlier flowering (mid-May continuing into June).
Since Thaspium grayi is not directly described in the search results, it is likely less commonly referenced or may be confused with these species. Given the detailed morphological and habitat distinctions for T. chapmanii, one could differentiate T. chapmanii from other Thaspium species by looking for its combination of pubescent leaves, pale corolla color, scabrellous peduncles, and specific habitat.
For precise differentiation between Thaspium grayi and Thaspium chapmanii, consulting a regional flora or taxonomic key that includes both species is recommended, as the available data primarily contrasts T. chapmanii with T. barbinode but not directly with T. grayi.
In summary:
- Look for leaf division, pubescence, flower color, peduncle texture, fruit size, and habitat.
- Thaspium chapmanii has more divided, hairy leaves, pale flowers, and scabrellous peduncles.
- Without direct data on Thaspium grayi, these features can help distinguish T. chapmanii from its close relatives, but further specialist resources are needed for T. grayi specifically.
Temporary link to response here: https://www.perplexity.ai/search/how-do-you-tell-the-difference-f2BvDp3vQh.mL7qk8XKK7w