io6 
THE CACTACEAE. 
Illustrations: Cact. Journ. i: pi. for March; 181; Wiener Ill. Gart. Zeit. 29: f. 22, 
No. 4; Monatsschr. Kakteenk. 8: 131; 15: 73; Forster, Handb. Cact. ed. 2. 522. K65; 523. 
f. 66; Cact. Mex. Bound, pi. 20; Meehan’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 cachetianus; 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 owpop/Ios top, and kclktos cactus, referring to the shape 
of the plant. 
Figs. 115 and 116.—Strombocactus disciformis. 
1 . Strombocactus disciformis (De Candolle). 
Mammillaria disciformis De Candolle, Mem. Mus. Hist. Nat. Paris T7: 114. 182S. 
Echinocactus turbiniformis Pfeiffer, Allg. Gartenz. 6: 275. 1838. 
Echinofossulocactus turbiniformis 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. iS9t. 
Cactus turbinatus Kuntze, Rev. Gen. PI. 1: 261. 1891. 
Anhalonium turbiniforme Weber, Diet. Hort. Bois go. 1893. 
Echinocactus disciformis Schumann in Engler and Prantl, Pflanzenfam. 3 6a : 189. 1S94. 
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. 
Type locality: Mineral del Monte, Mexico. 
Distribution: Central Mexico. 
