'450 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
All of the New Mexican material that we have seen is to be referred to Mamillaria 
heydert rather than the subspecies hemisphaerica, if the character which gives rise to 
the name is considered. The New Mexican plant is always flat-topped, with more or 
less turbinate thickened root. It is not infrequently even larger than described. 
7. Mamillaria dasyacantha Engelm. Proc. Amer. Acad. 3: 268. 1856. 
Type LocALity: ‘‘E] Paso and eastward,’’ Texas. 
Rance: Western Texas to southern Arizona and adjacent Mexico. 
New Mexico: Big Hatchet Mountains; Kingston; Lake Valley; Mogollon Creek. 
Dry mountains, in the Lower and Upper Sonoran zones. 
8. Mamillaria macromeris Engelm. in Wisliz. Mem. North. Mex. 97. 1848. 
Type Locauity: Sandy soil near Dona Ana, New Mexico. Type collected by 
Wislizenus. 
Rance: Southern New Mexico to western Texas and Chihuahua. 
New Mexico: Dona Ana; Parkers Well; plains south of White Sands; Tortugas 
Mountain. Mesas and sandy soil, in the Lower Sonoran Zone. 
One of the commonest Mamillarias of the southern part of the State, growing on sandy 
mesas, forming rounded clumps sometimes almost a meter in diameter. The indi- 
vidual plants are frequently 20 cm. long, fully half of the length being under ground. 
They are rather dark green; the tubercles are large, the groove never reaching the 
summit and soinetimes wanting in young plants; the spines are long, the radials dull- 
colored and often bent, the centrals dark, almost black, slender but stiff. The flowers 
are a bright rose purple, sometimes lighter, often turning lavender; they are large, 5 
cm. long or more and opening as wide, and usually are produced in profusion in the 
middle of the summer. The species is a very desirable one for cultivation 
9. Mamillaria scheerii Miithlenpf. Allg. Gartenz. 15: 97. 1847. 
TYPE LocaLity: Mexico. 
Rance: Southern New Mexico, trans-Pecos Texas, and adjacent Mexico. 
New Mexico: Lordsburg; mesa near Agricultural College. Gravelly mesas and in 
the mountains, in the Lower Sonoran Zone. 
Only 4 or 5 plants have been found around the Agricultural College. 
The flowers are 5 or 6 cm. long and of a peculiar bronze or brownish yellow, different 
from most of our other Cactaceae. The single plants sometimes reach a height of 15 
cm. and almost as great a diameter, being the largest single Mamillaria plants found 
in New Mexico. The tubercles in such plants are 25 mm. long, and are distant, 
spreading, and conic; the central spines are stout, one of them more or less curved 
downward at the tip but not hooked. The fruit is green, pulpy, irregularly clavate 
or obovate, with numerous brownish red seeds. It is one of the most interesting of 
the New Mexican Mamillarias for pot culture. 
10. Mamillaria tuberculosa Engelm. Proc. Amer. Acad. 3: 268. 1856. 
Mamillaria strobiliformis Scheer in Salm-Dyck, Cact. Hort. Dyck. 104. 1850, not 
Miihlenpf. 1848, nor Engelm. 1848. 
Type Locauity: ‘From the Pecos to Leon Springs, Eagle Springs, and El Paso, on 
the higher mountains,’’ Texas. 
RanaeE: Southern New Mexico, trans-Pecos Texas, and adjacent Mexico. 
New Mexico: Tortugas Mountain; Van Pattens; near Hillsboro. Low, dry moun- 
tains, in the Lower and Upper Sonoran zones, mostly on limestone soil. 
This little plant, with its dense coat of white radial spines and dusky-tipped cen- 
trals, its proliferous habit, its tuberculate base, its small pink flowers, and its bright 
red, tart fruit, is one of the commonest species of the southern part of the State, where 
it is found growing in the crevices of limestone rocks, 
