Anisophyllum macropus Klotzsch & Garcke in Klotzsch (1860: 33)

≡ Euphorbia macropus (Klotzsch & Garcke) Boissier in Candolle (1862: 59).

Lectotype (designated here):— MEXICO. [Hidalgo: Real del Monte], s.d., C.A. Ehrenberg 624 (F no. 196303!).

This perennial herb is common in temperate forests from southeastern Arizona, U.S.A., to Honduras. Although now treated in Euphorbia, it was first proposed in the segregate genus Anisophyllum Haworth (1812: 159), an illegitimate homonym of Anisophyllum Jacquin (1763: 283) . The protologue contains a morphological description and “Hab. in Mexico (Carol. Ehrenberg).” Boissier (1862) cites an Ehrenberg specimen at B from “Real del monte et Cerro Vento.” This specimen is no longer at B and was presumably obliterated in the Second World War. There is a fragment from Charles Frederick Millspaugh’s private herbarium, now at F, that bears the information “Authentic Material of Euphorbia macropus . From specimen No. 624 collected by C. Ehrenberg at Real del Monte. Ex herbario Berol.” Although the specimen is scrappy and consists of a few short branchlets with cyathia, it is clearly identifiable as Euphorbia macropus . Being the only known original material, it is designated as lectotype.