Two new species of Spigelia (Loganiaceae) from the states of Guerrero and Estado de Mexico are described here. This species represents a case of convergence with a species native to South America, Spigelia nicotianiiflora. With this addition, Mexico reaches a total of 22 species of the genus, of which more than 50% are endemic or microendemic. This places the country as the second highest area of diversity after Brazil. A map of the distribution in Mexico and a dichotomous key for Spigelia species with white corollas are included.

Sépalos pubescentes; hojas oblongas a oblanceoladas. 7. Exhalimolobos 12. Flores amarillas. 15. Silicuas pubescentes, con tricomas dendríticos 2-3 radios, con 1 nervadura prominente. 6. Erysimum 15. Silicuas glabras, sin nervaduras o 3 nervaduras prominentes. 16. Silicuas ovoides, elipsoides, oblongas, piriformes, valvas sin nervaduras prominentes, semillas en 2 hileras. 15. Rorippa 16. Silicuas lineares o lanceolados, cilíndricas, valvas con 3 nervaduras prominentes, semillas en 1 hilera. 16. Sisymbrium

Two species are described and illustrated of the state of Guerrero, México: Brongniartia alvarezii and B. variabilis (Fabaceae: Faboideae). They are similar to B. funiculata and B. abbottiae but have several distinguishing characteristics. All four species have relatively small flowers and grow in the temperate forest. Brongniartia alvarezii has yellowish white petals, something very rare on the genus, while B. variabilis has pink or pale pink standard and wings.