Euphorbia hammeri, K. A. Bradley & Sadle, 2021

Weakley, Alan S., Poindexter, Derick B., Medford, Hannah C., Franck, Alan R., Bradley, Keith A., Sadle, Jimi & Kelley, John Michael, 2021, Studies In The Vascular Flora Of The Southeastern United States. Vii, Journal of the Botanical Research Institute of Texas 15 (1), pp. 23-56 : 39

KEY TO EUPHORBIA HAMMERI AND RELATIVES IN SOUTHERN FLORIDA

1. Capsules uniformly pubescent;foliage generally pubescent ___________________________________________ Euphorbia garberi 1. Capsules glabrous,or slightly pubescent on the angles only;foliage glabrous to rarely slightly pubescent. 2. Leaves (2.2–)3.0–6.0(–8.3)× longer than wide, narrowly lanceolate to linear elliptic, 1-veined, glands of the cyathia

narrower than or equal to the gland appendages in radial dimension;cyathia, glands,gland appendages, capsules,

and stems light to deep red to purple;[mainland southern Florida]__________________________________ Euphorbia hammeri 2. Leaves 0.01–3.0(–3.5)× longer than wide,ovate to lanceolate,1–3-veined,glands of the cyathia wider than the gland

appendages in radial dimension; cyathia, glands, gland appendages, capsules, and stems light green to light red;

[mainland southern Florida,or Florida Keys ].

3. Leaves linear-elliptic, (1.0–)1.8–2.5(–3.5)× longer than wide, 1-veined to weakly 3-veined; leaf apex acute;

glands of the cyathia 0.4–0.6 mm in lateral dimension;[ Florida Keys ] _______________________________ Euphorbia ogdenii

3. Leaves ovate-elliptic,1.0–1.7(–2)× longer than wide, 3-veined;leaf apex obtuse to rounded;glands of the cyathia

0.6–1.0 mm in lateral dimension; [mainland southern Florida] ___________________________________ Euphorbia porteriana