184 CACTACEZ OF THE BOUNDARY. 
by Dr. Bigelow about Santa Rosa. Tubercles compressed, incurved, imbricated. Radial spines on the upper ones 
about 20, with 4 longer and darker incurved central ones ; the upper ones bent upward, and almost mixed with the 
upper radial ones ; lower one mostly over an inch long. This species and the two preceding may possibly be forms of 
De Candolle’s M. cornifera. 
18. M. caucarata, E. in Plant. Lindh., has been collected by Mr. Wright as far west as the Nueces River. 
His specimens have only 8 or 10 radial spines, 4-6 lines long; central spine of the same length, but stouter, often 
(in young specimens ?) entirely wanting. Lindheimer’s oritinad specimens from the neighborhood of the Colorado 
and Guadaloupe Rivers have 10-12 radial spines, 8-9 lines long; central spine stouter but shorter, sometimes 
wanting ; seeds similar to that of M. pectinata, but larger and very obtuse at base; 1.1 to 2 lines long. (Tab. LXXIV. 
fig. os 
M. TUBERCULOSA, sp. nov.: ovata seu ovato-cylindrica, simplex seu ad basin ramosa; tuberculis e basi 
iieciilas ovatis abbreviatis obtusis, rubcompresis profunde usque ad axillam villosissimam sulco villoso exaratis 
confertis imbricatis, demum nudatis suberosis persistentibus ; areolis orbiculatis, novellis albo-tomentosis ; aculeis 
exterioribus 20-30 rigidis gracilibus albidis nunc apice sphacelatis radiantibus intertextis, interioribus 5-9 robustioribus 
sursum czsio-purpureis apice sphacelatis, quorum superiores longiores erecti versus caulis apicem in comam aggregati, 
inferior brevior robustus porrectus deflexusve ; floribus in vertice densissime tomentoso centralibus ee dilute 
roseis ; sepalis 16-18 lanceolatis arachnoideo-fimbriatis ; petalis 10-13 lineari-lanceolatis aristatis subint ; bacca 
ovata elongata floris rudimentis breviter convolutis coronata rubra; seminibus subgloboso-obovatis pare, fuscis, 
ilo ovato minuto ventrali. (Ta . 
From the Pecos to Leon Seiten gle Springs, as El Paso, on the higher mountains, Wright ; especially on the 
rocky summits of the “ Flounce Mountains,” below aso, Bigelow. Flowers in May and June. — A very pretty 
and well-defined species of the mountain region. Sime eat inches high, 1-2 inches in diameter, often with globose 
branches at the base ; tubercles mostly only 3 lines long, and of the same width at base, often shorter, rarely and only 
in very vigorous plants 4 or even 5 lines long; in 13, or on the lower part of old plants in 21, spiral rows, like the 
whole body of the plant, of a corky texture and substance, almost dry, and therefore not shrivelling when old, but, 
after shedding the spines, persistent and covering the older parts of the stem as grey, corky tuberosities, whence the 
name. The deep, densely woolly groove, and the very woolly axilla, which loses its coating only after several years, 
are quite peculiar to this species. Radial spines usually 22-26, rarely less than 20, and never in the numerous speci- 
mens examined by me more than 30, very slender but stiff, usually 2-4 lines long, sei and a few upper ones 2 lines, 
most upper ones 3-4 lines long, uppermost rarely 5 or even 6 lines in length; lower stout central spine 3-4, upper 
ones 5-7, and in a few specimens even 8 or 9 lines long; those of the epperiniet alsa crowded together, erect, 
forming a purplish gray tuft, which surrounds and partly hides flowers and fruit. Flowers very pale purple, about 
1 inch in diameter ; berry oval, elongated, and sometimes almost cylindric, red, and by both these characters 
distinguished from the fruit of the allied species ; remains of flower not irregularly shrivelled up as in those [15] 
species, but forming a regular, conic, whitish head on the red fruit. Seeds 0.4 or 0.6 line long, unusually thick, 
with a very small oval, not linear, hilum, 
. M. DASYACANTHA, sp. nov.: simplex, subglobosa ; tuberculis teretibus leviter usque ad basin sulcatis laxis ; 
axillis suleoque subvillosis mox nudatis ; areolis orbiculatis novellis, albo-tomentosis ; aculeis gracilibus vix spine- 
scentibus rectis patulis, exterioribus 25-35 capillaceis albidis apice sphacelatis, interioribus 7-13 setaceis longioribus 
infra pallidioribus sursum purpureo-fuscis apice atratis, centrali singulo sequilongo porrecto nune deficiente ; florum 
parvorum centralium sepalis arachnoideo-fimbriatis ; baccis verticalibus ovatis parvis ; seminibus obovato-globosis 
angulatis scrobiculatis nigricantibus ; hilo lineari stiteventrali. (Tab. XII. fig. 17-22. 
El Paso and Eagle Springs ; Wright. — The few specimens before me are from 14-23 inches high, a little less in 
diameter ; tubercles slender, 4-5 lines long, in 13 spiral rows ; grooves slightly hairy when young ; axils more or less 
villous, soon becoming naked. Spines not strictly soaps but loosely spreading, much more slender than in the last 
and the next species, often even capillary ; exterior ones 3-6 or even 9 lines long ; interior spines forming a circle 
with the exterior ones, but darker, wae pot longer ; upper ones 8-12 lines, lower ones 6-9 lines long, 
or in some specimens shorter and slenderer; central spine single, erect, 6-10 lines long, often wanting. The dry and 
shrivelled fruit found on the tomentose vertex was ate 3} lines long; seeds thick, sometimes triangular, with a very 
broad back, 0.4-0.6 line long, almost black ; hilum quite different i in shape and position from that of the next species, 
to which this is closely allied. The plant so much resembles Echinocactus intertextus, var. dasyacanthus, that at first 
sight it might be taken for it. 
21. M. vivrpara, Haw. Cactus viviparus, Nutt. Gen. 
along the upper Missouri and Yellowstone rivers, and up into the Black Hills and Rocky Mountains. I 
plant, either simple or usually profusely proliferous and cespitose ; shoots always from the base of the groove on the 
This species is found only on the northwestern: plains, 
0 
