Anisophyllum macropus Klotzsch & Garcke

Steinmann, Victor W., 2023, Typification of Mexican Euphorbia (Euphorbiaceae), Phytotaxa 630 (1), pp. 61-68 : 62

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.