190 CACTACEH OF THE BOUNDARY. 
remains of the flower, green and very acid (Bigelow), or insipid or sweetish when fully ripe (Parry). Seed larger 
than in the last species, 0.7-0.8 line in the longest diameter, deeply and distinctly pitted under the lens. 
E. Wisuizent, E, in Wisliz. Rep., has been often collected, by the different gentlemen attached to the Com- 
mission, between Dofia Ana and El Paso, and probably on the upper Gila, but not eastward. Small specimens show 
only 13 ribs ; full-grown ones usually have 21 or even as many as 24 ribs. Areole from } to 1} inch distant from one 
another ; on older plants closer than on half-grown ones. Three lower radial spines annulated, stout, 8-20 lines long ; 
3 upper ones somewhat slenderer, but also annulated, 1}-2 inches long; in younger specimens these latter are 
wanting, in old ones they move more toward the centre of the areola and become surrounded by the upper bristly 
spines ; lateral bristle-spines 15-20, 1}-2} inches long, often twisted, spreading horizontally. All the stouter and 
annulated spines are red, with paler semitransparent points ; the weaker spines are yellow'sh-white. Ovary and 
fruit imbricately covered with 60 or 80 scales ; fruit rather fleshy but not juicy, and soon hardening. Seed oblique 
obovate, 1.0-1.2 line long; hilum small, broadly oval, subbasilar, or sometimes almost ventral ; surface of the 
seed finely reticulated under the lens; curved foliaceous cotyledons partly buried in the large albumen. (Tab. 
XXV.-XXVLI.) 
8. E. Le Conret, E. in Pacif. R. Report. This fine species, which was discovered by Dr. Le Conte on the 
lower Gila, and found again by Dr. Bigelow higher up on the Colorado, has been observed frequently by Mr. Schott 
in the western part of Sonora, where it flowers in August and September. The flowers, which had not been seen by 
any other observer, may be described thus : 
Floribus plurimis subcentralibus ; ovario squamis 30-50 sepaloideis reniformibus munito, sepalis tubi inferiori- 
bus 20-30 ovato-lanceolatis acutis ciliatis, superioribus 10-20 margine petaloideis obtusiusculis cuspidatis ; petalis 
20-30 lineari-spathulatis obtusis inciso-fimbriatis mucronatis sulphureis ; tubo basi intus nudo ; stylo stamina superante 
ad medium in stigmata sub-14 linearia fasciculata diviso. (Tab. XXVII. 
Mr. Schott’s specimens were 3-4 feet high, clavate, and usually only one third as thick. Dr. Bigelow’s specimens 
were not as slender. Flowers 2 inches in length, “ somewhat campanulate ;” petals “lemon-yellow,” with a brown- 
ish tint along the midrib ; tube naked for about one line above the base of the style. 
9. E. Emory, E. in Emory’s Rep., 1848: grandis, ovatus, glaucescens ; costis 13-21 rectis obliquisve obtusis 
tuberculatis ; areolis ovatis junioribus dense sordideque tomentosis ; aculeis 8-9 subxqualibus robustis subangulatis 
annulatis paulo recurvis rubellis demum fuscis apice sub pellucido corneis, radialibus 7 seu (interdum adjecto aculeo 
tenuiore summo) 8, lateralibus sublongioribus, centrali singulo recurvo seu subhamato paulo robustiore ; floribus 
magnis purpureo-variegatis ; sepalis ovarii 25 reniformibus ciliolatis, superioribus spathulatis lanceolatis 
acutis ; petalis sub-25 lanceolatis acuminatis versus apicem fibriato-fissis ; stylo stamina vix superante profunde [24] 
18-20-partito. (Tab. XXVIII) 
the Gila, Emory ; the lower Colorado, Bigelow ; and in Sonora, at Punta de Agua, Sierra del Pajarito, 
Sierra de la Union, and Sierra de Sonoyta, Schott. Flowers in August and September. — Largest plants 30-36 inches 
high and 18-24 inches in diameter, with 20 or more ribs, smaller ones a foot in diameter and globose, only 13-ribbed. 
Ribs strongly tuberculated ; tubercles quite distinct — especially on the younger plants —and rounded, on old plants 
more confluent. Areole 6-10 lines long, 14-2 inches apart, oval, separated from the contiguous but smaller floral 
areola by 2-5 terete obtuse finally ligneous glands. Radial spines mostly 1-2 inches long, — in a very large specimen 
from Guaymas, on the Gulf of California, procured by Dr. Bigelow, and now in the Congressional Garden in Washing- 
ton, nearly 3 inches long; the 4 upper lateral spines are the longest and stoutest ; the lower ones, and if present the 
uppermost radial spine (in the specimen from Guaymas sometimes 2), are shorter and slenderer than the others. 
Flowers aggregated near the vertex, about 3 inches long, dark brown-purple outside ; petals red, with yellowish 
margins ; filaments rising from the thick and fleshy upper part of the short tube, leaving its lower part naked, 
extremely numerous ; style thick, as long as the longer (exterior) stamina, divided to the middle into 18 or 20 filiform 
stigmata. Fruit and seed as yet unknown. 
10. E. viRIpEscENs, Nutt.: globosus seu depressus, simplex seu e basi ramosus ; vertice depresso tomentoso ; 
costis 13-21 compressis vix tuberculatis ; areolis orbiculato-ovatis junioribus tomentosis; aculeis compressis annulatis 
plus minus curvatis e virescente rubellis, radialibus 9-13 (18-20, ex Parry) infimo robusto breviore deorsum curvato, 
centralibus 4 robustioribus 4-angulatis compressis cruciatis, inferiore latiore longiore minus curvato ; floribus sub- 
verticalibus e flavo virescentibus ; ovario globoso squamis sepaloideis 25-40 semilunatis reniformibusve dentic 
imbricatis stipato ; sepalis tubi 25-30 ovatis oblongisve obtusis ; petalis 20 oblongis obtusis eroso-denticulatis ; 
usque ad medium in stigmata 12-15 linearia erecta albida diviso ; bacca ovata seu subglobosa squamata virescente 
floris rudimentis coronata ; seminibus oblique obovatis dorso carinatis minutissime scrobiculatis, hilo orbiculato parvo 
subventrali. (Tab. XXIX.) . 
San Diego, California, on dry hills and ridges, Nuttall, Parry ; on the sea-beach, Schott. — According to N uttall, 
this species is about 1 foot high, and has 9 or 10 inches diameter. Dr. Parry found them usually flat, 4 or 5 inches 
ulatis 
stylo 
