. Carnegie Institution of Washington publication. io6 THE CACTACEAE. Illustrations: Cact. Journ. i: pi. for March; 181; Wiener 111. Gart. Zeit. 29: f. 22, No. 4; Monatsschr. Kakteenk. 8: 131; 15: 73; Forster, Handb. Caet. ed. 2. 522. f. 65; 523. f. 66; Cact. Mex. Bound, pi. 20; Median's Monthly 9: pi. 6; Mollers Deutsche Gart. Zeit. 25: 474. f. 6, No. 23; Schumann, Gesamtb. Kakteen f. 59; Schelle, Handb. Kakteenk. 158. f. 87, as Echinocactus setispinus; Monatsschr. Kakteenk. 1: pi. 9; Gartenwelt 9: 266, as Echinocactus cachetiamts; Mollers Deutsche Gart. Zeit. 25: 474. f. 6, No. 29, as Echinoc
. Carnegie Institution of Washington publication. io6 THE CACTACEAE. Illustrations: Cact. Journ. i: pi. for March; 181; Wiener 111. Gart. Zeit. 29: f. 22, No. 4; Monatsschr. Kakteenk. 8: 131; 15: 73; Forster, Handb. Caet. ed. 2. 522. f. 65; 523. f. 66; Cact. Mex. Bound, pi. 20; Median's Monthly 9: pi. 6; Mollers Deutsche Gart. Zeit. 25: 474. f. 6, No. 23; Schumann, Gesamtb. Kakteen f. 59; Schelle, Handb. Kakteenk. 158. f. 87, as Echinocactus setispinus; Monatsschr. Kakteenk. 1: pi. 9; Gartenwelt 9: 266, as Echinocactus cachetiamts; Mollers Deutsche Gart. Zeit. 25: 474. f. 6, No. 29, as Echinocactus setispinus longispinus. Figures no and 111 show a flower and fruit copied from plate 20 of Cactaceae of the Mexican Boundary; figures 112 and 113 are from photographs made by Robert Runyon at Brownsville, Texas; figure 114 is from a photograph of a plant sent from Brownsville by Robert Runyon. 13. STROMBOCACTUS gen. nov. A low, depressed, nearly spineless cactus, with imbricated chartaceous scale-like tubercles; flowers small, central, subcampanulate, nearly white; scales on the flower-tube with thin papery margins; scales on the ovary only near the top, small; fruit nearly naked; seeds small. Type species: Mammillaria disciformis De Candolle. One species is known, native of Mexico. The generic name is from arpoiifios top, and kclktos cactus, referring to the shape of the Figs. 115 and 116.—Strombocactus disciformis. 1. Strombocactus disciformis (De Candolle). Mammillaria disciformis De Candolle, Mem. Mus. Hist. Nat. Paris 17: 114. 182S. Echinocactus iurbiniformis Pfeiffer, Allg. Gartenz. 6: 275. 1838. Echinofossulocactus Iurbiniformis Lawrence in Loudon, Gard. Mag. 17: 318. 1841. Mammillaria turbinata Hooker in Curtis's Bot. Mag. 69: pi. 3984. 1843. Cactus disciformis Kuntze, Rev. Gen. PI. 1: 260. 1891. Cactus turbinatus Kuntze, Rev. Gen. PI. 1: 261. 1891. Anhalonium lurbiniforme Weber, Diet. Hort. Bois 90. 1893. Echinocactus disciformis Schumann in Engler and
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