SYNOPSIS OF THE CACTACEZ OF THE UNITED STATES. 141 
ANALYSIS. 
I. Petala parva, subulata, suberecta. Subgen. 1. STENOPUNTIA, 
II. Petala lata, obovata seu obcordata. 
1. Articuli complanati: abies circa albumen parcum spiraliter convolutus, ° Subgen. 2. PLATOPUNTIA. 
A succosa : margo seminum plerumque angustior (Sarcocarpee). 
Glabre. a parva subglobosa. § 1. Microcarpee. 
« * Articuli magni: aculei pauci ame § 2. Grandes. 
* * * Articuli minores: aculei setiformes. § 3. Setispine. 
* * * Articuli minores: aculei pauci, ~biat, teretes. § 4. Vulgares. 
b. Pubescentes. § 5. Pubescentes. 
B. Bacca sicca: margo seminum plerumque latissimus. § 6. Xeroca 
2. ners beg : embryo circa albumen copiosius subcircularis. Subgen. 3. CYLINDROPUNTIA. 
culi pubwneiati, clavati. § 1. Clavate. . 
~ ida cylindracei, elongati. § 2. Cylindrice. 
Subgen. 1. Srenopuntia, E. in B. C. R. Articuli complanati: flores parvi: petala subulata: stigmata 
pauca. 
1. O. sTeNopeTALA, E. 1. ¢.: prostrata ; articulis magnis; aculeis 1-3 cum minoribus 1-3 ancipitibus deflexis 
atrofuscis ; ovario pulvillis confertis stipato ; sepalis petalisque subulatis suberectis ; stylo inflato ; stigmate 
simplici. 
n the battle-field of Buena Vista, south of Saltillo. Nearly allied to the Mexican O. grandis, Hort. Angl., 
which has very similar flowers, but is an erect plant, with few and white spines, and 2 or 3 acute stigmata, 
Subgen. 2. Pratopuntta, E. 1. c. Artienli complanati: flores magni: bacca pulposa vel rarius sicca: [290] 
semina late — embryo plusquam circularis circa albumen parcum spiraliter convolutus : cotyledones 
semper contrariz 
§ 1. Microcarpe& : suberectz : aculei plurimi, colorati: bacca parva subglobosa. 
TRIGIL, E. in B. C. R.: suberecta, articulis ovatis orbiculatisve; pulvillis confertis; aculeis 5-8 
gadianitbes deters rufis.apice flavis ; bacca parva late umbilicata rubra ; seminibus parvis anguste marginatis. 
e Pecos and El Piss: — Plant 2 feet high ; joints 4~5 inches long ; spines an inch or less in length. 
Fruit 6-7 ial ig: 
§ 2. GRANDES: erectz seu procumbentes: articuli magni: aculei pauci, validi, compressi, plerumque colorati: bacca 
major vel magna, plerumque ovata. 
« Subinermes. 
3. O. Ficus-Inpica, Mill: cultivated south of the Rio Grande, under the name Nopal Castillano. 
* « Flavispine. 
Erecte. 
4. O. Tuna, Mill: cultivated about the old missions in the southern parts of upper California, under the name 
Tuna. Specimens gathered at Beaufort, on the coast of South Carolina (probably introduced), may belong here. 
5. O. ENGELMANNI, Salm: erecta, grandis; articulis obovatis ; pulvillis remotis setas stramineas rigidas 
ineequales aculeosque 1-3 compressos stramineos basi rufos gerentibus; floris flavi intus rubelli ovario subgloboso ; 
stigmatibus 8-10; bacca obovata late umbilicata ; seminibus minoribus. 
From the Canadian River to the mouth of the Rio Grande, and westward from the Gulf to Chihuahua and 
El Paso; flowers May and June. — Plant 4-6 feet high ; joints a foot long or less ; leaves subulate, 3-4 lines long ; 
larger spines 1-14 inches long. Flower 24-3 inches in diameter. Fruit usually 2 inches long, 1} in diameter, 
juicy, but of a somewhat nauseous taste. Seeds 1-2 lines in diameter. A plant observed by Dr. Blackie on Bayou 
Beeuf, western i 54 feet high, joints 9 inches long, reddish-yellow flowers, is probably this species. 
0. Li meri, E. Plant. Lindh , is partly this same plant, partly a hybrid form between it and perhaps [291] 
O. Rafinesquit, ih narrow clavate ‘eae 
. ENGELMANNI, var.? cycLopes, E. & B. in P. R. R.: articulis orbiculatis ; aculeis validioribus subsingulis ; 
bacca parva globosa ; seminibus majoribus. 
On the upper Pecos, in New Mexico. Joints 6-7 inches, and fruit 1 or 1} inches in diameter. 
O. putcis, E. in B. C. R., is a doubtful plant, of which we have not material enough. It-has been found near 
the middle course of the Rio Grande, near Presidio del Norte, etc. It is similar to 0. Engelmanni, and may be a form 
of it; but it is lower, more spreading, with a similar but very sweet fruit, and small regular seeds. 
