List of species that have not been observed on iNaturalist yet
These are the species that have not been observed in the US, but are on the list. Some have been observed elsewhere and some haven't. The plants in most need of being observed are the ones that haven't been observed at all on iNaturalist. The list is broken into the various subgroups within Euphorbia that occur in the US. Out of 156 on the list, only 28 species are left that haven't been found (11 continental; 3 introduced; 6 observed elsewhere; and 8 continental US native species not observed in total).
Other than sect. Alectoroctonum, subg. Esula, and sect. Anisophyllum (2):
E. tithymaloides subsp. smallii (FL; subg. Euphorbia sect. Crepidaria; observed in cultivation)
Subg. Esula (6; 3 native):
!E. austrotexana var. carrii (TX)
!E. georgiana (GA)
E. trichotoma (FL; observed elsewhere)
E. agraria (WY, ND, SD, NE, KA, MN, IA, NY?, PA?; introduced; observed in Europe)
E. paralias (PA; introduced; observed elsewhere)
E. herniarifolia (MD; introduced; possibly absent, only listed in BONAP, not listed in New England Atlas)
E. serrata (CA; introduced; observed elsewhere; may be eradicated)
Subg. Chamaesyce sect. Anisophyllum (AZ, CA, HI, and TX; 2):
E. trachysperma (AZ; observed in Mexico)
!Hawaii (15; needs updating once observations curated):
Most varieties of E. celastroides (HI)
E. clusiifolia (HI)
E. deppeana (HI)
E. kuwaleana (HI)
E. rockii (HI)
E. skottsbergii (HI)
Species in sect. Anisophyllum from the continental US that have 3 or fewer observations in total (State; number of observations):
E. geyeri var. wheeleriana (NM, TX; 3)
E. ocellata var. ratanii (CA; 3)
Comentarios
Do you know any specific sites for E. platysperma?
Not offhand, though I imagine you could find it in the algodones dunes. It loves deep sand dunes. I remember seeing a specimen near Yuma, AZ. It is more common in Sonora. Calflora has some sites south of the Salton Sea. I'm a bit skeptical about the observations further north but will have to look into it.
It looks similar to E. carunculata (https://www.inaturalist.org/observations/1486108) but is a little smaller. The two are likely sister taxa.
platysperma has been high on my list of plants to find, chasing old records, etc, but so far without success.
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