Alabama Euphorbia species
Provided below is a list of the Euphorbia species of Alabama. I have provided a little additional information on the species outside of section Anisophyllum and section Nummulariopsis. I may write a separate journal post for section Anisophyllum and have already written one for section Nummulariopsis (which can be found here). Links: iNaturalist Alabama species list (not updated), BONAP, Flora of North America.
Subgenus Esula
E. commutata - Angles of fruits essentially smooth; native.
E. peplus- Angles of fruit with two wings; introduced.
E. spathulata - Angles of fruits warty; native.
Section Poinsettia
Lower leaves alternate, stems glabrous
E. cyathophora - Bracts typically red basally, linear or broader; glands oblong, 1 per cyathium.
E. heterophylla - Bracts green (sometimes whitish basally); glands circular.
Lower leaves opposite, stems hairy
E. dentata - Seeds essentially round in crossection, tubercles evenly distributed.
Section Alectoroctonum
Most petaloid appendages as long as the glands are wide or shorter
E. mercurialina
Petaloid appendages at least 2-3 times as long as the glands are wide or longer
E. corollata - Leaves lanceolate or wider, not revolute; appendages longer than 2.2 mm long.
E. pubentissima - Leaves lanceolate or wider, not revolute; appendages shorter than 2.2 mm long.
E. discoidalis - Leaves linear to ocassionally ovate, revolute; appendages shorter than 2.2 mm long.
E. inundata var. inundata
E. floridana
Section Anisophyllum (11)
E. bombensis
E. cordifolia
E. hirta
E. humistrata
E. hypericiolia
E. hyssopifolia
E. maculata
E. nutans
E. ophthalmica
E. prostrata
E. serpens
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