192 CACTACEZ OF THE BOUNDARY. 
wise, lower older ones transverse and very distinct ; grooves between the ribs about an inch deep; areole of the 
spines } inch in diameter, orbicular, or with the closely adjoining floriferous areola oval, about ? inch long. Radial 
spines in my specimen 8 or 9, “often as many as 11;” lower ones divergent stoutest, upper ones more slender. 
Central spines 4, stouter and 14-2 inches long, somewhat bulbous at base ; upper and lower one, especially the last, 
stoutest nee longest. 
species is nearly allied to the last; but even in the absence of seeds we can distinguish it by the simple 
globose or i esaaeiel depressed heads and the white spines. I have named it after Dr. C. C. Parry, who, by his 
intelligent observations and copious notes about the Cactacee of the Boundary, has greatly assisted me in their 
elucidation. 
14, E. HORIZONTHALONIUS, Lemaire, var. CENTRISPINUS: glaucus, depresso-globosus (vetustus szepius ovatus 
umbilicatus) ; costis 8 obtusissimis latissimis ; sinubus superficialibus acutis ; tuberculis sulco transverso inconspicuo 
vix distinctis ; areolis orbiculatis basi truncatis prominulis, junioribus albo-lanatis ; aculeis 6-8 robustis compressis 
annulatis rubellis demum cinereis, radialibus 5-7, superioribus debilioribus, infimo deficiente, centrali sin- 
gulo robustiore sites deorsum flexo ; floribus ex vertice densissime lanato centralibus campanulatis ; ovario tuboque 
lana longa dense vestito ; sepalis exterioribus 60-70 subulatis linearibus et lanceolato-linearibus spinoso-aristatis 
atropurpureis nudis ex Jana copiosissima axillari vix exsertis ; sepalis interioribus sub-15 obovato-lanceolatis mucro- 
natis am nudis ; petalis sub-36 oblongis obtusis eroso-dentatis roseo-purpureis ; stylo supra stamina numerosissima 
flava exserto rubello ; stigmatibus 6-8 brevibus erecto-patulis ; bacca rubra succosa mox desiccata lana densa involuta 
floris nseriatnes spinescentibus coronata a basi fere persistente circumscissa decidua ; seminibus subglobosis rugosis 
minutissime tuberculatis nigris opacis, hilo transverso ventrali ; embryone exalbuminoso suberecto ehavaite 5 ; cotyle- 
donibus brevissimis. (Tab. XXXI., XXXII., fig. 1-5.) 
Stony soil on the summit of hills, from the Pecos to El Paso, and north to Dofia Ana; Wislizenus, Wright, 
Bigelow, Parry. Flowers April and May, and “ continuing to put out its beautiful flowers till July.” — Easily dis- 
tinguished by the broad obtuse ribs. The numerous specimens examined by me are all depressed, 14-4 inches high 
and 24-6 inches in diameter, but old specimens are said to be sometimes 6-8 inches high, oblong, and even cylindric. 
Ribs in very young specimens, 5; in all the flowering plants which I have seen, 8 and “sometimes 10”; in young 
plants the ribs are scarcely Weenie iia but in srs ones they are divided by more or less shallow grooves into very 
broad tubercles. Areole 6-10 lines apart, covered with long wool when young. Spines mostly 6-8, rarely 9, 
#-14 inch (and usually 1 inch) long, nearly equ in length, very variable in shape and thickness, sometimes 
long and slender and almost terete, in “other specimens short, stout, and broad. Flower 23 inches long, of the [27] 
same diameter, open only in bright sunshine, light purple or pink; tube lighter colored ; ovary very short 
(3 lines), globose; tips of sepals dark purple, protruding from the dense white wool which érivdlops the whole flower; 
stamens of a flower, counted by Mr. Wright, 1266. Berry juicy, but drying up very soon, and finally breaking oft 
transversely, leaving the base with most of the seeds hidden in the thick wool. The seeds, even when fully ripe, look 
shrivelled, and are 1.2-1.5 line long; the large circular (or rather truncate and transverse) hilum is deeply immersed ; 
embryo almost without albumen, and quite straight, with thick, very short, erect cotyledons, and a taper-point 
radicle. 
lant seems to be a variety of E. horizonthalonius, which is described as having 7 straight radial spines, the 
lowest one a little longer than the others, and the flower pale rose-colored, with lanceolate-acuminate petals. Prince 
Salm’s var. 8. curvispinus seems still nearer to our plant, which has a decidedly central but no lower radial spine, 
just like the last and the next species; the space for the lower radial spine is covered and filled by the strongly 
deflexed central spine. 
15. E. Texensts, Hopf. Not observed farther west than the San Pedro and Pecos rivers. Fruit red and 
juicy, drying up very soon; seeds 1.2~1.4 line long, somewhat reniform, with a deep indentation including the circular 
hilum; testa smooth and dante, rarely (in Berlandier’s specimens from Matamoras named by him Melocactus lacinia- 
tus) indistinctly tuberculated ; pets curved or hooked, with the foliaceous cotyledons buried in the large albumen. 
(Tab. XX XIII.) 
16. E. Bicotor, Galeotti, var. Scporrit: simplex, ovatus vel ovatiylindvictte; costis 8 obtusis tuberculatis 
interruptis; areolis oa ciee ; aculeis radialibus 15-17 rectis, inferioribus brevioribus teretinsculis basi 
rubellis variegatis, summis 2-4 longioribus latioribus Tabi albidis; aculeis centralibus 4 albidis, summo latiore 
longiore supra plano pn carinato recto seu paulo sursum curvato, ceteris compressis seu subteretibus brevioribus 
rectis ; floribus magnis in vertice tomentoso eS ovario squamis sepaloideis 10-12 reniformibus : 
iat imbricato, sepalis tubi 40 sensim majoribus obtuais margine pallidiore ciliatis, summis oblongis ; — 
purpureis ; stigmatibus 8 suberectis 
On cretaceous — covered with ship (thorny bushes), near Mier, on the lower Rio Grande ; Schott. In 
flower in September. — Stem 4-6 inches high, 2-3 in diameter; grooves rather shallow ; floral areola close to the 
