8 UNITED STATES AND MEXICAN BOUNDARY. 
petaloideis ; petalis 12 lineari-lanceolatis acuminatis aristatis purpureis ; bacca majuscula ovato- 
globosa succosa purpurascente floris rudimentis coronata ; seminibus obovatis basi acutis nigris 
scrobiculatis, hilo subventrali parvo angusto. (Tab. VIII, fig. 1-8.) 
New Mexico, near the Copper mines, Wright ; near El Paso, Parry ; and on the upper Pecos, 
east of Santa Fé, Bigelow.—Stems 13-3 inches in diameter, hemispherical above, flattened or 
depressed in the centre, and top-shaped below ; simple, as all the Mamillarie of that form 
usually are. Tubercles 5-6 lines long; spines 4-6 lines in length, shorter in the southwestern, 
longer in the northeastern specimens ; uppermost radial spine stouter than the others, with a brown 
tip, or smaller and slender, or entirely watiting ; central spines usually 2 side by side, diverging 
laterally, or rarely one above the other; sometimes only one, or not seldom 3, the third one 
being below the two others ; the hooks usually turned downward, or in different directions. The 
flowers seem to be lateral but very near the vertex, the fruit is moved more outward by the con- 
tinuous growth of the plant. Flower about an inch long and fully as wide ; petals and margin 
of inner sepals bright purple. Berry large, nearly an inch long, purplish ; seed similar to that of 
M. Grahami, but much larger; and the very small and narrow hilum ventral; length of seed 
0.7 line.—This species I with pleasure dedicate to my friend, Mr. Charles Wright, to whose 
indefatigable exertions botany owes so many new discoveries along the Mexican boundary line, 
and lately in more distant parts of the globe. 
7. M. Goopricuir, Scheer: globosa seu ovata, subsimplex ; vertice tomentoso ; tuberculis ovatis 
abbreviatis; axillis junioribus lanatis setigeris demum nudatis; aculeis radialibus 11-15 
(plerumque 12-13) albidis apice sphacelatis intertextis, centralibus 3-4 (in plantis junioribus 
subsingulis) fusco-atris, superioribus divergentibus rectis seu rarissime subuncinatis, inferiore 
paullo longiore robustiore sursum hamato; floribus in vertice lateralibus parvis ; petalis lanceo- 
latis acuminatis sordide flavidulis medio rubellis; stigmatibus 3 virescentibus. (Tab. VIII., 
fig. 9-14.) 
Dry ravineS near San Diego, California, Dr. Parry; originally brought to England from the 
Island of Cerro on the Californian coast.—One of the specimens of Dr. Parry, from which the 
above description was drawn, is 2 inches high, and 14 inch in diameter, the other is globose 
and rather depressed; the tubercles are 14-2} lines long and of a somewhat corky texture, 
like those of M. Grahami, so that the dead ones retain their shape and do not shrivel up. The 
axils produce a very dense wool, and in it 5-8 stiff bristles which often reach the length 
of the tubercle. The radial spines are 24-3} lines long, the uppermost one present or wanting. 
The upper central spines, 2 or 3 in number, are straight, or rarely in my specimens with a ten- 
dency to form a hook ; the lower central spine is the longest one, 44-5 lines long, the narrow, 
or rarely wide hook is turned upward or sidewise. Flowers 6-9 lines long, 6 lines wide, 
dirty yellowish, the petals with red midribs. 
8. M. Heyperr, Muhlenpf., of which my M. applanata, (Plate 9, fig..4-14,) and M. hemis- 
pherica, (Plate 9, fig. 15-17,) published in Plante Lindheimeriane, are different forms, is 
common threughout the southern parts of New Mexico, and may even extend into Sonora, ac- 
cording to Mr. Schott’s notes, unless what he has seén isa form of M. gummifera, (Tab. IX, fig. 
18-20,) brought by Dr. Wislizenus from the mountains west of Chihuahua. The Sonora plant 
is stated to have 13 radial spines, the inferior ones are 6-8 lines and the superior ones 2-3 
lines long, the stout central spine is of the length of the latter. 
