Euphorbia sect. Anisophyllum

Silva, Marcos José Da, Feitosa, Gabriel Lucas & Riina, Ricarda, 2021, Seek and you shall find: rediscovery of the Brazilian Euphorbia burchellii (Euphorbiaceae) after nearly a century and a half, with a conspectus of Euphorbia sect. Anisophyllum species in the state of Goiás, Brazil, Phytotaxa 479 (1), pp. 83-94 : 91

Key to the species of Euphorbia sect. Anisophyllum in Goiás state

1. Plants erect or decumbent...................................................................................................................................................................2

- Plants clearly prostrate .....................................................................................................................................................................11

2. Leaves with only a single central vein evident...................................................................................................................................3

- Leaves with central and secondary veins evident...............................................................................................................................4

3. Plants glabrous up to 40 cm tall; leaves 6−55 × 1−15 mm, with asymmetric base; cyathia in a pleiocasial or dichasial synflorescence, peduncles 0.6−1.6 mm long; pistillate flowers 1−1.5 mm long, styles bipartite, stigmas clavate .................. E. potentilloides Boiss.

- Plants puberulent up to 11 cm tall; leaves 6−14.7 × 1−3 mm, with symmetric base; cyathia solitary, peduncles 3.2− 1.7 cm; pistillate flowers 3.5−4.6 mm long; styles 0.5−1.2 mm long, erect, glabrous, entire, sometimes slightly lobed at apex, yellowish to brownish; stigmas punctiform ......................................................................................................................................... E. burchellii Müll. Arg.

4. Leaves with secondary veins branch freely before reaching the margin............................................................................................5

- Leaves with three or more primary veins diverging radially from a single point ..............................................................................9

5. Plants decumbent with stems glabrous or puberulent; leaves fleshy; cyathia with peduncle of 9−26 mm long; pedicel in fruit 6−8 mm long....................................................................................................................................................... E. chamaerrhodos Boiss.

- Plants erect with stems pubescent, velutinous or hirsute; leaves mebranaceous; cyathia with peduncle of 0.5−5 mm long; pedicel in fruit 0.5−5 mm long........................................................................................................................................................................7