OPUNTIA 



Articulations or joints strik- 

 ingly different, flat to ci/- 

 iDiilrical 



ArtiriiUitions or joints sim- 

 ilar, more or less flat- 



ned. 



Spe: 





Fruit fifshy or succulent. 

 ^ize of joints large: plants 



mostly large (O. crassa 



moderately small). 

 Color of spines white 



Galapageia 

 monacantha 

 aurantiaca 

 crinifera 



microdasys 



basilaris 



puberula 



leucotricha 

 . triacantha 

 . candelabriformis 



Spines always present, few 

 to many. {One form of 

 O. macrocentra has no 

 spines, and occasional 

 plants of O. chlorotica are 

 without spines. ) 14. 



EE. Size of joints small: joints 

 variable in shape: plants 

 mostly low or prostrate. 

 ( Some forms of O. Rafin- 

 esquii have moderately 

 large joints. ) 2 



lar, more or less cylindri- 

 cal. 



B. Species from S. America. 



c. fToints cylindrical, mostly 

 elongated .'J 



polyantha 



Tuna 



chlorotica 



pycnacantha 



Engelmannii 



phEeacantha 

 . Camanchica 

 . macrocentra 



nigricans 



filipendula 

 Rafinesquii 

 vulgaris 

 Pes-corvi 



ursina 



hystricina 



Missouriensis 



rutila 



arenaria 



fragilis 



cylindrica 



:!.'>. clavarioides 

 :»). Salmiana 

 cc. Joints globose to broadly 



obovate 37. Darwinii 



."iS. diademata 

 BB. Species from jV. America, 

 c. Spines without .':heatl,.i: 

 plants mostly small, irilh 

 clavate joints .!;». pulchella 



40. clavata 



41. f?-nhiTiiii 



42. Schottii 

 i:i. Emoryi 

 44. invicta 



OPUNTIA 



cc. Spines sheathed: joints cy- 

 lindrical or nearly so, 

 more or less elongated. 



D. Number of spines variable, 



always more than one. 



E. Frtdt dry, usually spiny. 



Vumber of spines few, usu- 

 ally one, rarely more or 

 wanting 



.45. Bavisii 

 4G. acanthocarpa 



47. echinocarpa 



48. Bernardina 

 4'J. serpentina 



.50. prolifera 

 51. Julgida 



.52. BigelOTii 



53. imbricata 



54. arborescens 



55. spinosior 

 5(i. Whlpplei 



57. versicolor 



58. tetracautha 



59. arbuscula 



60. leptocaulis 



61. ■ ■ 



1. BTasili^nsiB, Haw. A large, tree-like plant r.-ach- 

 ing a height of 15-18 ft., numerously branched, with a 

 thick, roundi.sh crown and an upright trunk, 4-6 in. in 

 diam., and bearing numerous spines 1 in. or less in 

 length: joints of two kinds, cylindrical, unarticulate, 

 elongate ones and others which are shorter and much 

 dattened and which arise as offshoots from the former; 

 the latter leaf-like, thin, 2-6 in. long, oblong, rarely ob- 

 long-lanceolate or orbicular, dark green, margin angu- 

 lar, sometimes irregular: areolte with short, gray wool 

 and numerous brown bristles; spines usually 1, some- 

 times 1-3 small additional ones, 1-2J^ in. long, mostly 

 from the marginal areolae, white, with brownish tips: 

 Hs. numerous, citron-yellow, 2 in. wide: fr. globo.se or 

 ellipsoidal, yellow, about 1>^ in. in diam. Brazil and 

 southwanl.-One i.f the s].efies most frequent in cult. 



2. Galapageia, Himsl. .An upright, tree-like plant 

 Ci-li) ft. Iiii;h. with a i-in-uhir. spreading crown and a 

 viry ^I'iny trunk, (l-b in. in diam., and light-colored 

 liar'k Ih .■..iniiiL' iMi.M-ned and hanging in fragments 



from II I !. r -ic 111^: joints elliptical to oblong, thick, 



l(i-lt III l..ii_' -iiii.s at first 3-4, spreading, flexible, 

 incna-in- in nunilH-r .and size with age, finally cover- 

 in!,' thi' joints with long, brush-like bundles: fls. small, 

 liss ilian 1 in. wide, red: fr. subglobose, red. Galapa- 



3. monacAntha, Haw. An upright plant branching 

 from the ground and reaching a height of 6 or more 

 feet: joints oblong to elliptical, rather thick, terminal 

 ones much thinner, 5-12 in. long, 3-6 in. wide, bright 

 green: areolip with uniformly short wool and yellowish 



in. Iniiir. y.llnw t.) (lark n-clrli^h l.n.wn: n^. yellow, » 

 -Thi- licrtirultural variety variegata is in the trade. 



lill. A numerously branched, rather 

 weak. ..rii,, pni-tiati- plant 3-5 ft. high: joints linear- 

 lancci.lat.- T.. lan'-i-olate, 2-10 in. long, J^-1 in. wide, ellip- 

 tical in tran^vtrse .section, dark green, turgid : areolae 

 with a tuft of grayish white wool and bright yellow 

 bri^tl.-i ; ?ipines 4-6, spreading, straight, stiif, brown 

 to yellow, the longest less than 1 in. in length: fls. yel- 

 low, l'.j-2 in. wide: fr. carmine-red, globose, with short 

 spines; seed with woolly hairs. Argentine Republic. 



5. crinifera. Pfeiff. (O. senilis. Parm.). A much- 

 branched, wide-spreading plant, about 3 ft. high: joints 

 obovate to elliptical, 6 in. long and 3-4 in. wide, dark 

 green, occasionally glossy: areolje crowded, small, with 

 white wool, numerous golden yellow bristles, and a 

 variable number of long silky hairs: spines 6-8. later 

 more, white, glistening, reaching 1 in. in length, the 

 long silky hairs particularly developed on the under 

 side of the young joints : fls. 3)^-4 in. wide, golden 

 yellow, of ten reddish. Brazil(!). 



