106 THE CACTACEAE. 
Illustrations: Cact. Journ. 1: pl. for March; 181; Wiener Ill. Gart. Zeit. 29: f. 22, 
No. 4; Monatsschr. Kakteenk. 8: 131; 15: 73; Férster, Handb. Cact. ed. 2. 522. f. 65; 523. 
f. 66; Cact. Mex. Bound. pl. 20; Meehan’s Monthly 9: pl. 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: pl. 9; Gartenwelt 9: 266, as 
Echinocactus cachetianus; Mollers Deutsche Gart. Zeit. 25: 474. f. 6, No. 29, as Echinocactus 
setispinus longispinus. 
Figures 110 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. 
\ 7%) 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 orpéuBos top, and xakros cactus, referring to the shape 
of the plant. 
Fics. 115 and 1 16.—Strombocactus disciformis. 
1, Strombocactus disciformis (De Candolle). 
Mammillaria disciformis De Candolle, Mém. Mus. Hist. Nat. Paris 17: 114. 1828 
Echinocactus turbiniformis Pfeiffer, Allg. Gartenz. 6: 275. 1838. 
Echinofossulocactus turbiniformis Lawrence in Loudon, Gard. Mag. 17: 318. 
Mammillaria turbinata Hooker in Curtis’s Bot. Mag. 69: pl. 3984 1843 
Cactus disciformis Kuntze, Rev. Gen. Pl. 1: 260. 1891. , , 
Cactus turbinatus Kuntze, Rev. Gen. Pl. 1: 26r. 1891. 
Anhalonium turbiniforme Weber, Dict. Hort. Bois go. 
Echinocactus disciformis Schumann in Engler and Prant 
Plants small, depressed, turbinate or semi-globose, 5 to 6 cm. broad; tubercles somewhat charta- 
ceous, imbricate, more or less winged, bearing 1 to 4, white, acicular spines when young, naked when 
old; young areoles with white wool, naked in age; flowers from center of plant, 2 cm. long or less; 
scales and outer perianth-segments dark red, with whitish margins; inner perianth-segments white, 
lanceolate, acute, spreading; filaments much shorter than the inner perianth-segments, purple; 
stigma-lobes about 7, long, twisted; ovary naked except at the top, small; fruit 7 mm. long; seeds 
3 mm. in diameter. , 
1841. 
1893. 
1, Pflanzenfam. 32: 189. 1894. 
Type locality: Mineral del Monte, Mexico. 
Distribution: Central Mexico. 
