. Carnegie Institution of Washington publication. CACTUS. 237. A living plant was sent to Dr. Rose by Professor C. Conzatti in October 1913 (No. 151a), from Salina Cruz, Oaxaca, and it has been reported by Dr. C. A. Purpus from San Geronimo. Dr. Purpus has written to us as follows: '' The Mclocactus from San Geronimo is indeed a most interesting and remark- able cactus. When I saw the cactus, I mean to say without a crown, very few specimens ever having one, I thought it was an Eclihiocaclus, but of course it is undoubtedly a small Mclocactus, the smallest which I ever saw. Later I found some
. Carnegie Institution of Washington publication. CACTUS. 237. A living plant was sent to Dr. Rose by Professor C. Conzatti in October 1913 (No. 151a), from Salina Cruz, Oaxaca, and it has been reported by Dr. C. A. Purpus from San Geronimo. Dr. Purpus has written to us as follows: '' The Mclocactus from San Geronimo is indeed a most interesting and remark- able cactus. When I saw the cactus, I mean to say without a crown, very few specimens ever having one, I thought it was an Eclihiocaclus, but of course it is undoubtedly a small Mclocactus, the smallest which I ever saw. Later I found some specimens with a woolly crown and with it flower and fruit. The flower and fruit resemble flower and fruit of a ; Here may belong Mclocactus curvispinus Pfeiffer (Enum. Cact. 46. 1837) and M. delessertianus Lemaire (Hort. Univ. 1: 225. 1839). Figure 249 shows a barren plant by C. Conzatti, referred to above. FlG neryi. DESCRIBED SPECIES. PERHAPS OF THIS GENUS. Cactus heptagonus Linnaeus, Sp. PL 466. 1753. Cereus heptagonus Miller, Gard. Diet. ed. 8. No. 6. 1768. The name has not been definitely associated with any known cactus by authors sub- sequent to Miller. Linnaeus indicates that the plant was of American origin and states (Hort. Cliff. 161) that "it is exactly ovate, with 7 angles deeply sculptured; some say they have seen the same thing 1 or 2 feet high, but our plant did not change its shape in ; Miller's account of it is not more satisfactory; he indicates that he received it, among other kinds of Cereus from the British Islands of America and that it has 7 or 8 ribs and several very long white spines. He also says: "Upright, thickest torch thistle, having many angles, several very long white spines and yellow ; There may be doubt whether Miller's plant was the same as that of Linnaeus. ('actus heterogonus (De Candolle, Prodr. 3: 470. 1828) is a misspelling for C. heptagonus. Cactus parvispinus Haworth, Suppl
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