24 UNITED STATES AND MEXICAN BOUNDARY. 
acutis ; petalis sub-25 lanceolatis acuminatis versus apicem fimbriato-fissis; stylo stamina 
vix superante profunde 18-20-partito. (Tab. XXVIII.) : 
On 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: fl. 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 Washington, 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 two), 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. virtpescens, 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 mimus curvato ; floribus subyerticali- 
bus e flavo virescentibus; ovario globoso squamis sepaloideis 25-40 semilunatis reniformibusve 
denticulatis imbricatis stipato ; sepalis tubi 25-30 ovatis oblongisve obtusis; petalis 20 oblongis 
obtusis eroso-denticulatis; stylo usque ad medium in stigmata 12-]5 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. X XIX.) 
San Diego, California, on dry hills and ridges Nuttall, Parry ; on the sea-beach, Schott. 
According to Nuttall this species is about 1 foot high, and has 9 or 10 inches diameter. Dr. 
Parry found them usually flat, 4 or 5 inches high (above ground) and 6-7 inches in diameter. 
They are usually simple, but sometimes, ‘‘ only when wounded or burned over by fires,’’ they 
branch from the base, forming in favorable situations quite a pile of prickly balls. In a young 
specimen brought home by Dr. Parry, about 2 inches in diameter, with 8 ribs, I find only 9 
radial slightly recurved spines ; the lowest and most curved one 4-6 lines long ; the 2 upper 
ones 6-8 lines, and the 6 lateral ones 8-9 lines long; the 4 central Spines are much stouter, more 
distinctly angular, compressed, and annulated, 10-16 lines long, the uppermost one more 
curved, the lovvest one almost straight. Schott,in his notes made on the spot, states the number 
of radial spines to be 13, much shorter than the central spines ; Parry describes the radial spines 
of the adult plant as 18-20, not more than 6~9 lines long, while the longest central spine is 
about 18 lines long. Flowers disposed in a circle around the vertex, greenish, 14 inch long, 14 
in diameter ; tube inside naked at base ; stamina short ; style about one inch long, more deeply 
divided than in other species. Fruit 8-10 lines long, of the shape and taste of a gooseberry ; 
