518 THE DICTIONARY OF GARDENING, 
Mammillaria—continued. 
Fig. 555. MAMMILLARIA SCHELMASIT. 
M. Schelhasii (Schelhas’). /l. white, with a line of rose down 
each petal, fin. across. Early summer. Stem producing offsets 
freely at the base, which grow into full-sized stems, and develop 
young ones till a compact cushion is formed ; tubercles closely 
arranged, cylindrical, shining green, with fifteen to twenty 
radial, white, hair-like spines sin. long, and three inner, thicker 
ones, usually only one being hooked, Mexico. See Fig. 559. 
M. Schmidtii (Schmidt's). A synonym of M, centricirrha, 
Tic. 556. MAMMILLARIA SEMPERVIVI. 
M. Sempervivi (ever-living). jl. inconspicuous and scantily 
developed near the outside of the top of the stem. Stem 
pear-shaped, 3in. wide, the top slightly depressed ; tubercles 
conical, jin. long, their bases set in a cushion of white wool, 
their tips bearing tiny tufts of wool, and four small spines, 
which fall away on the tubercles becoming ripe, leaving two 
short, diverging, central spines. Near Zimapan, Mexico (at 
an elevation of 5000ft.). See Fig. 556. M. Caput-Meduse is a 
form of this species. - 
Mammillaria—continued. 
M. Spaethiana (Spaeth’s). his closely resembles M. Purpusi; 
the chief difference is in the shape of the stem, which is 
depressed-globose rather than conical. Mountains of Colorado, 
1894. 
M. sphacelata (dark, withered). jl. rather small; sepals 
reddish-brown; petals blood-red. “May. Stem 8in. high, 
cylindrical, becoming proliferous; tubercles almost conical, 
rhomboid ‘at base, the axils nearly naked; radial spines 
fourteen to eighteen, ivory-white, red at apex, and becoming 
blackish and sphacelate, the central three or four erect. 
Mexico. 
M. strobiliformis (strobiliform), of Scheer. A synonym of 
M. tuberculosa. 
Fic. 557. MawMILLARIA SUB-POLYHEDRA. 
M. sub-polyhedra (often many-sided).* jl. arranged in a zone 
on the tops of the old stems; sepals greenish-yellow ; petals 
bright red. May. fr. scarlet, lin. long, pear-shaped, Stem 
simple (till it becomes old, when it develops offsets at the 
base), broadly cylindrical, 8in. high, Sin. in diameter ; tubercles 
four-sided at base, prism-shaped, bearing pads of white wool 
in the corners at the base, and crowned with tufts of four to 
Mexico. See Fig. 557. A beautiful species. It requires plenty 
of light. A moist atmosphere is fatal to success. 
Fic. 558. MAMMILLARIA SULCOLANATA. 
M. sulcolanata (woolly-grooved). jl. bright yellow, Poppy- 
scented, nearly 2in. across, the spread of the petals suggesting 
Paris Daisies. June to August. fr. glaucous-green, egg- 
shaped. Stem simple when young, proliferous at sides when 
old, the young plants developing from the apices of the 
seven spines, usually all radial, sometimes one central. South ~ 
a 
