CACTACEZ OF THE BOUNDARY. 185 
tubercle or the axil proper, while in ¥. calcarata they come from the upper part of the groove, just below the spines. 
Radial spines 12-20, stiff, white, often brown-red at the top, 3-4 lines long; central spines 4 (3 pointing upward and 
the stoutest and shortest downward), but sometimes less, and often more, as many even as 8, usually 4-6 lines long. 
Flowers central, large for the size of the plant, about 1} inch long, and even more in diameter when fully open (which 
is te one 0 thik later than in most other ‘Cactacex), with 30 or more delicately fimbriate recurved sepals and 
25-40 narrow acuminate eienls petals, which are naked or fimbriate at base ; filaments whitish or purplish, almost from 
the dae of the tube ; anthers orange ; style long-exserted, with 5-10 linear pale or purple stigmata, which are pointed 
with a short mucro. Berries becoming lateral, being pushed aside by the continuous growth from the ipl of the 
plant, oval, 3-2 inch long, pale green, juicy, and slightly acid, full of yellowish-brown seeds. These 0.7-0.8 line 
long, obliquely obovate, somewhat concave on the compressed ventral portion about the small Sa idinee hilum, 
itted ; albumen more distinct than in most other Mamillarie; embryo straight, linear-oblong, with very short connate 
cotyledons. (Tab. LXXIV. fig. 3.) : 
The following form, from Texas, which formerly I thought I could distinguish from this northern species, 
seems to be connected to it by numerous intermediate forms found in the geographically intermediate region of New 
Mexico 
Subsp. 8. RADIOSA: ovata seu demum subcylindrica, ea seu e basi ramosa ; tuberculis teretibus laxis 
leviter sulcatis ; aculeis radialibus numero maxime variis (12-40), superioribus longioribus robustioribus, cen- [16] 
tralibus, 3-12, quorum superiores robustiores, radialibus “theater inferior robustus porrectus brevior ; floribus 
in vention demum lateralibus ; sepalis 30-40 lineari-lanceolatis arachnoideo-fimbriatis apice recurvis squarrosis ; petalis 
totidem linearibus sensim acuminatis integris seu exterioribus basi fimbriatis ; stigmatibus 5-10 obtusis purpureis 
patulis ; bacca ovata floris rudimentis coronata viridi; seminibus obovatis scrobiculatis fulvis, hilo erecto parvo 
lineari ventrali. 
it Var BOREALIS : ovata seu subglobosa, subsimplex ; aculeis radialibus 12-20, centralibus 3-6 purpureo- 
macula : ickipin minoribus ; sepalis sub-25; petalis sub-30; seminibus minoribus ventre concavis. M. vivipara, 
n Plant. Fendl. in Mem. Amer. Acad. (Tab. LXXIV. fig. 4 
r. B. Neo-MEXxIcANA: ovata seu ovato-cylindrica, sepe e basi ramosa ; aculeis radialibus albidis sub-30 
(20-40), ‘contsalibae 6-9 _—- infra albidis sursum purpurascentibus apice atratis; floribus majoribus ; seminibus 
— ventre subconca 
a xana (M. esi es E. in Plant. Lindh.) : ovato-cylindrica, subsimplex ; aculeis radialibus 20-30 albidis 
apice pene fate? 4-5 flavis seu fulvis; floribus majoribus ; sepalis 40-50 ; petalis 30-40 ; stigmatibus 7-9 ; 
’ seminibus magnis ventre subconvexis.. (Tab. LXXIV. fig. 5 
Var. a has been collected in northern New Mexico and about Santa Fé by W idles and Fendler: 8 in the 
western parts of Texas and the southern parts of New Mexico by Wright and Bigelow ; by the latte r also on the upper 
Pecos, and in Sonora (a form with more spines than any other) by Schott. Var. y was sent by Lindheimer from the 
Pierdenales, a tributary of the Guadaloupe in western Texas. Flowers in May and June. — Var. y is y is the largest form, 
2-5 inches high, with flowers 14-2} inches in diameter when fully expanded, and de fully 1 line long. pale, B is 
an intermediate form, 14 or 2 to 4 inches high, 1-25 inches in diameter ; 3 tubercles 3-6 lines long. Spines very 
variable in length and number ; in smaller younger specimens the exterior spines are 2-4 lines jad the interior 
3-6 lines long ; in larger ones the former are often 3-8 lines and bi latter 5-10 lines ids Seed 0.7-0.9 line long, 
almost straight on the side of the hilum, or usually somewhat con — Var. a approaches very near to M. vivipara 
of the north. The spines, however, are stouter, the flowers ee a the tubercles rarely proliferous ; seeds as large 
as in ee last, and of similar shape. 
22. M. macromerts, E. in Wisliz. Rep.: simplex, seu ex sulcis tuberculorum inferiorum prolifera et eee 
caespitosa, ovata seu cylindracea, lete viridis; tuberc ulis magnis e basi dilatata elongatis teretiuseulis supra sulco 
(juniore villoso) ad medium ultrave usque ad areolam euiean tomentosam supra-axillarem producto — 
sdabsicend fii patulis Jaxis seu rarius plus minus imbricatis ; aculeis gracilibus — teretibus seu robustioribus 
angulatis compressisve rectis seu paulo curvatis, exterioribus sub-12 (10- ees albidis seu saa 
subinde abel apice shasslaiias § inferioribus seepe paulo revioribus ; ; aculeis ae in plantis junioribus 
~3 raro deficientibus), longioribus robustioribus basi b — ag raro roseis fuscisve ; 
oribus pe geen ribus magnis e coccineo pu ureis ; ovario nudo seu squama una alterave sepaloidea munito ; 
as tubi 20-30 lanceolatis, inferioribus fimbriatis, superioribus enn: petalis 20-25 ee ee 
versus cate denticulatis mucronatis ; stigmatibus 7-8 supra stamina longe exsertis ; bacca ovato-subg sa 
nuda seu squamis paucis ciliatis instructa viridi ; seminibus globoso-obovatis levibus falvi is, hilo ick oan [17] 
ventricali ; albumine parco ; embryone recto ; cotyledonibus minutis. (Tab. XT 
In the valley of the Rio Grande, from Dofia Ana, above El Paso (W iad to the cafion below that town 
(Wright), and to the mouth of the Pecos and to Eagle Pass — and lower down, mostly in loose sand, on hillocks 
Vv 
