CACTACEA OF THE BOUNDARY. 193 
spiniferous one, without the intervening glands which are so conspicuous in FE. longehamatus and others, and which 
I find also in the Mexican forms of E. 
rounded, red, paler at both ends ; 
central spine 15-20 lines long ; the 
the lower radial spines. 
fading ; filaments springing from the whole 
three others shorter ; 
icolor. The 4 upper radial spines about an inch long and flat ; 
the lowest is the weakest and s 
the lower one flat above, rounded below, often reddish like 
Flower between 2 and 3 siachieee long ; 
tube down to its bas se 
all the others 
rtest one, and often somewhat curved : upper 
He bright-purple or rose-purple, gradually paler in 
1e original Mexican E. bicolor is distinguished by the more globose form, also by the smaller number of radial 
spines (10-11), and by the upper central spine not being carinate nor longer than the others. 
17. E. INTERTEXTUS, sp. n 
breviter tomentoso-sulcatis ; 
ov.: minor, ovato-globosus ; 
areolis ovatis (in planta juniore angustioribus) approximatis ; aculeis brevibus 
costis 13 acutis interruptis subobliquis; tuberculis supra 
rigidis e basi albida scipaihie apice fuscatis, radialibus 16-25 arcte adpressis intertextis, superioribus 5-9 setaceis [28] - 
albidis rectis, lateralibus rigidioribus paulo longioribus infimoque robusto brevi spe paolo recurvatis ; 
ibus sursum versis, inferiore brevissimo porrecto robusto ; 
cuspidatis albo-marginatis ; 
seminibus reniformibus circa hilum magnum or 
parco ; bates curvato; cotyledonibus Sash brevibus. 
oS YACANTHUS: ovatus seu 
ovario brevissimo 5—6-squamato ; 
petalis 20-25 oblongis mucronatis ; 
bus 7-8 purpureis erectis ; ; bacca globosa sicca squamis evanecoudtibes subnuda basi su 
iculare ventrale curvatis tenuiter coltiatas lucidis ; album 
aculeis 
floribus parvis 
sepalis tubi 20 late ovatis 
stylo stamina numerosissima vix aa ane stigmati- 
istente circumscissa ; 
(Tab. XXXIV.) 
oideus ; aculeis gracilibus longioribus e purpurascente cesiis, radiali- 
taceis pluriserialibus, aieciadis 7-9 gracilioribus brevioribus albidis fasciculatis, centralibus 4 vix 
bus se 
robustioribus, superioribus 3 
figs. 1-5. 
ss 
sursum versis reliquos excedentibus, inferiore porrecto paulo breviore. 
(Plate XX XV. 
On stony ridges from the Limpia to El Paso, Wright, Bigelow ; and westward, Parry ; also toward Chihuahua, 
Wislizenus. Var. 8. common about El Paso. 
diameter ; areolz 3 or 4 lines a 
2-4 lines long; upper central spines 5-7 and e 
13-15 radiating spines are m 
lighter colored ; stamens more than 650 
large hilum 
Flowers March and April. — Stems 1-4 inches high and a little less in 
t. Upper setaceous spines pale, 2}—6 lines long ; lateral spines 4-7 lines, lowest only 
n 9 lines, lower one 1 or rarely 2 lines long : 
ore equal in length, sah several or all of the central ~e are wan 
an inch long and wide ; sepals dark purple with paler margins; petals similar, outer o 
, half as long as petals. 
flower, usually with a few dried scales, ‘with or welsuet some wool in their axils ; the base 
time, while the upper part comes off, separating more or less regularly. 
ng plants the 
es deeper, inner ones gradually 
nes in nae tipped by the withered 
usually persistent for some 
Seeds nearly or quite 1 line long, with a very 
Fruit about 4 lin 
Var. 8. has the flowers and fruit of var. a., but is a larger plant, with much longer and slenderer spines ; lower 
central spine almost as long as the others. ae in var. a. app 
r. 8B. the spines are loosely patulous 
pti entire similarity of flower and Suit, and the intermediate forms of 
. been confounded with, Cereus balsseniea A 
whole plant is very similar to 
ed so that the plant resembles somewhat, and has 
s, forming a tuft on the top. The 
M. dasyaca 
the spines, leave no doubt of both plants nia together, though their external appearance is so very dissimilar. 
III. CEREUS, Hav. 
Subgen. 1. 
. C. vrriprriorvs, E. in Wisliz. Rep., B. 
Ecnurnocerevs, E.® 
CYLINDRICUS : ovatus seu plerumque cylindricus, subsimplex ; 
costis oe acutis fere interruptis ; areolis confertis ovatis seu ovato-lanceolatis, junioribus albo-villosis mox [29] 
denudatis ;# aculeis 12-18 radialibus brevibus pectinatis rigidis, adjectis plerumque supra aculeis adventitiis 
8 This subgenus, which was indicated by me in the Ap- 
fruit pointed out in the work above mentio: he numer- 
us species since d e con this character. The 
seeds especially are distinct from those of any other Cactacee 
1 line (between 0.4 and 0.9 line) in length, obliquely obovate 
or ote more or less com pressed, and with a circular 
or oblon ar hilum; testa black, hard, 
and brittle, always peer ; its tubercles large or small, 
equal or unequal, distinct or more or less confluent, and then 
the greater density or looseness of this tomentum, and in its 
color, which is almost always white, but areas yellow- 
Il only make 
ish, gray, tawny, brown, or almost black. 
mention of it where it varies from the aces form. 
5 
