OPUNTIA 



in. wide, ■ionutiiri.s twice as large, dark to lis'it Kroen: 

 areohr- .ahIj - r.< . aioI and bright reddish brown bris- 

 tles: ^j' , ;;■ - wanting, when present l-!t and 



raosti) :. lit, 1 in. long, white with darker 



tips ami I' i~i <. ti ' ipn-iitly 1-3 small secondary spines 

 also present : tis. H in. or less in diam., golden yellow, 

 frequently with reddish center: fr. slender-clavate or 

 broader, lK-2 in. long, yellowish red to purple, with 

 insipid purplii 



«»»f..o1 IT c 



usually 1, stout, erect, less than 1 in. long, yidlow, often 

 variegated: lis. 2 in. wide, pale or chrome-yellow: fr. 

 obovate to spherical, 1 in. in diam., red, flesh insipid. 

 Eastern V. S. Hardy in Mass. 



26. Pe3-c6rvi, LeConte. A small, diffn.se, prostrate 

 plant, rarely reaching 1 ft. in height: joints fragile, 

 somewhat tumid, narrowly ovate to obovate or olilong, 

 2-4 in. long and less than half as wide, frequently much 

 smaller, very tliick, broadly oval in transverse section, 

 bright green with a bluish tinge: areolfe circulnr, with 

 short, whitish wool and a few short, slender, pale 

 bristles; spines rarely exceeding 2, frequently none, 

 slender, white, often brownish, less than 1 in. long: fls. 

 yellow, IH in. wide: fr. obovate, bristly, purplish, 1 in. 

 or less in diam; seeds comparatively large, very few. 

 Florida. 



27. urslna, Web. (Grizihi-hctr Ojmiitia). Fig. 1.-4S. 

 An upright, ditfuse phuii, i ' ii IilIi- 1..1111. ,,i,|..iiL' i- 

 obovate, grayish green, i!. .: ' > u 1 1 

 wide: ariohe with wliii. I 1 1 . . 1 ; 

 bristles; spines 12-20. nd.ii ii w hi'. , \ .1 , - 1, mi, r iumI 

 bristle-like, sometimes 4 m. imig, !n-i|nentiy almost 

 completely hilling the epidermis of the plant: lis. 2>o-;i 

 in. wide, reddish yellow. Calif. — Popularly known as 

 "Grizzly Bear" Caetns. 



28. hystricina, Engelm and Bigel. A semi-prostrate, 

 spreading plant. %-!% ft. high: joints obovate to or- 

 bictilar, .'i-.'i in. long, moderately thick and very spiny: 

 areolie with grayish wool and yellowish red bristles; 

 spines 10-1.^, 2 in. long or shorter, white or dusky, slen- 

 der, flexile, angular and twisted: fls. light purple, 2-3 in. 

 wide: fr. broadly obovate, 1 in. in diam., armed with 

 many long spines. Southwest U. S. 



29. MissouriSnsis, P. DC. (O. feror, Haw. O. sph'n- 

 deux, Hort.). A prostrate, wide-spreading plant, rarely 

 rising 1 ft. above the ground: joints variable, from 

 elongate-obovate to orbicular, usually bright green, fre- 

 quently wrinkled and tuberculate, 2-6 in. long: areolte 

 about % in. apart, with short, grayish wool and long, 

 reddish brown bristles; spines 0-12, very variable in 

 length, number and color on different forms and plants 

 from different Inr.ilities, mostly marginal, white or va- 

 riously tui-_-i'd rvi*1i red or brown, slender, twisted and 

 flatten.! ■ i hl- a length of .S in. : fls. yellow, 

 darli.i- Ml. wide: fr. broadly ovate or sub- 

 glob. is. . ! .111., armed with numerous rather 

 shorts] ' '■iiiparatively large. West-central 

 U.S. \ 1 I. distribution and very variable, 

 some 1. ': , .; 1 forms entirely without spines, 

 while . . I . armed with a close network of 

 closel\ I ' .\ nuint)er of the forms have 



sperma, albisplna 

 iir to run t.igether 

 ..ubtful value. 11: 



been - 



arc ruii-,. 1. . , ]•' li-. . ,i:'|i 



trichoji!! ' i 



the viin. . . 



inMas^a. i.i.-.iis. 



30. rutila, Nutt. A low, diffuse plant, K to 1 ft. high: 

 joints tumid, readily becoming detached, and covereil 

 :>rk of slender, interwoven, light grnv 



blende 



Hs. 



se, usually arnieo with very lont', in- 



.^: seeds comparatively large. South- 



F.ngelm. A diffuse plant with upright 



lally 1 in. or less 

 vate to globose. 

 Southwest U. S. 



rostrate plant, rarely 

 id, fragjle, easily de- 



very spiny; >..e.ls i:,f^,- a 



32. frigllis, Haw. A 1 



more than 4 in. high: joi 



taohed, oval, elliptical, or subglobose, 1-2 in. long 

 nearlv as thick as broad, 

 bri!;h"t green: nreolie M- 

 '.. in. ii|.:irl. w itl, whitish 

 w.i.d i.n.l II t.iv white 



rhich 



in. wide: fr 



-li yellow, later ..-rayish: fl; 

 111 end of joints: fr. py-=«— - 

 r.-en, somewhat spiny. 



iform, 

 Chile. 



34. vestita, Salm. A 

 branched, ramify.ng pla 

 joints rather short. 1-2 i 



sl.Mi.hr branches: Ivs. extremely sni 

 g.tliiT. small, with white wool; spit 

 fewer, very small and appressed, 

 wiile and twice as long, greenish 

 V2--'4 in. long: seeds with woolly 1 

 cristata is offered. 



with 1 



spines, thick, elongate-i 



2-4 in. long: 



36. Salmi4na, Pami. .A. numerously branched, up- 

 right plant, about 3 ft. high, with very long, propor- 



