OPUNTIA 



1149 



in. wiile. sometimes twice as lai-ffe. d.irk to liglit green: 

 areolae with gray wool and hrisrlit ri'.l.lish brown bris- 

 tles; spines sometimes waiitiiii:. whrn (n-csent 1-^ and 

 mostly marginal, stout, 1 lu. I'nm, while with darker 

 tips and bases, frequently 1-.'. -iii.ill >. rdndary spines 

 also present : lis. a in. ur l.s^ in .liain.. ^'olden yellow, 

 frequently with rcldisli .riu. i : fr. sleuder-elavate or 

 broader, lK-2 in. |..ii^', \.ll,,«ish red to purple, with 

 insipid purplish i.ul|.: ^., ,u .,.iii|,aratively large. West 

 central U. S. — An PNctM-dinirly variable species of wide 

 distribution and impert'ectiy known. Many varieties 

 have been described, some of which are in thi trailr-. 



extreme 

 these forms i 



chlla and macrorhlza have appeared in the trail. 

 Hardy in Mass. 



25. vuls&ris, Mill. Barberry Pig. A diffuse, pm- 

 trate plant a foot or less high: joints usually resting' nn 

 the ground and rooting from the lower margin, obovat'. 

 to suborbicular, thick. 2-4 in. in greatest diani., pale 

 green : areolae with grayish wool and a few short, greenish 

 yellow bristles; spines rarely present, when present 

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

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

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

 Eastern U. S. Hardy in Mass. 



2G. Pes-c6rvi, LeConte. A small, diffuse, prostrate 

 plant, rarely reacliiiii; 1 ft. in height: joints fragile, 

 somewhat tumid, iianowiy evate to obovate or oblong, 

 2-4 in. long and le-^~^ tlim iiaif as wide, frequently much 

 smaller, very thick, hrc.aclly oval in transverse section, 

 bright green with a bluish tinge: areolae circular, 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: tls. 

 yellow, IM in. wide: fr. obovate, bristly, purplLsh, 1 in. 

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

 Florida. 



27. urslna, Web. [Grizsly-hear Opuntia). Fig. 1548. 

 An upright, diffuse plant, 1-2 ft. high: joints oblong to 

 obovate, grayish green, thick, .3-6 in. long and 2-4 in. 

 wide: ariolse with white wool and numerous yellow 

 bristles; spines 12-20, reddish white, very slender and 

 bristle-like, sometimes 4 in. long, frequently almost 

 completely hiding the epidermis of the plant: fls. 2^-3 

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

 "Grizzly Bear" Cactus. 



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

 spreading plant, M-IH ft. high: joints obovate to or- 

 bicular, 3-.5 in. long, moderately thick and very spiny: 

 areoliB with grayish wool and yellowish red bristles; 

 spines 10-15, 2 in. long or shorter, white or d\isky, 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. Missouri^nsis, P. DC. (O. ferox, Haw. O. spUn- 

 dens, 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-fi in. long: areolfB 

 about y^ in. apart, with short, grayish wool and long, 

 reddish brown bristles; spines 0-i2, very variable in 

 length, number and color on different forms and plants 



mostly marginal, white or va- 

 r hrnwn, slender, twisted and 

 T 1 Ti -th of 3 in. : fls. yellow, 

 l>roadly ovate or sub- 

 « ith numerous rather 

 1\ large. West-central 

 I 11 iiin and very variable, 



:iiis ( ntirely without spines, 

 med w ith a close network of 

 A number of the forms have 

 f which the best known 

 Tufisplna, platycilrpa, miorospferma, albisplna and 

 triobbphora. All the forms appear to run together and 

 the varietal distinctions are of doulitful value. Hardy 

 in Massachusetts. 



30. ratila, Nutt. A low, diffitse plant. M to 1 ft. high: 

 joints tumid, readily becoming detached, and covered 

 with a close network of slender, interwoven, light gray 

 spines, thick, elongate-ovate, 2-4 in. long: areolae 



from different localitie: 



riously tinged with red 



flattened -erne n i<hni 



darker -w 1 1 i 



globos, 



short SI II 



U .S - V s| , , 



while other forms are 

 closely mterwoven ones 

 egregated 



crowded, less than Yi in. apart, with short, white wool 

 and yellow bristles; spines 3-5, sometimes a few short 

 accessory ones, slender, reddish gray to white, with 

 darker tips, 1 Ji in. or less in length, larger ones often 

 flattened and twisted : fls. red, 1 Vi-i in. wide : f r. broadly 

 ovate to subglobose. usually armed with very long, in- 

 terwoven s,,ine^; ^ee.K .-oniparatively large. South- 



.11. arenaria, Em;, bn. .\ .iiffuse plant with upright 

 terminal j..iiii-. lai. ly r. a. lung 1 ft. in height: joints 

 tbi.k. .ihovat. . _'-.'. in. long and half as wide, tumid, 

 str(.iiirly tub.-i-.'iilate: areola* crowded, M-^2 in. apart, 

 with sparse whit.- wool and numerous yellowish brown 

 bristh-s : >pin.s very variable in number and size, 3-10, 

 si. ii.l.-r. tiexible, white to ashy gray, usually 1 in. or less 

 hill:;. IN. yellow, 2-iyi in. broad: fr. ovate to globose. 

 \ . ry spiny; seeds large and irregular. Southwest U. S. 



:;■-'- fragilis. Haw. A small, prostrate plant, rarely 

 in. ill I. Ill 1 ill Iiif,'li: joints tumid, fragile, easily de- 

 ta. 1 n.al, or subglobose, 1-2 in. long and 



to subglobose, with few- 

 spines or bristles, mostly 

 sterile, an inch or less 

 long ; seeds few and 

 large. Ro.-ky iii.iiuitaiii 

 region from H r i t i s li 



Var.br-flchyS,rthra,( '.mlt. 

 A plant with more swol- 

 len joints, more numer- 

 ous and stronger spines, 

 smaller fls. and more 

 spiny fruit. Colo., New 

 Mex." 



.33. cylindrica, P. DC. - 

 plant, 10-12 ft. hiiih. with 

 new growth dark gre.-n. tI 

 Ivs. persisting for S..11I. n 

 little white wool, a f.-« v 



spines 4-8, either short, flexible and grayish yellow or 

 four times as long l,yi-% in.), stift' and red: fls. 1-1 H in. 

 wide, mostly lateral, dark red: fr. ellipsoidal, '%-% in. 

 long, bright red and covered with grayish wool. Bolivia. 

 3."i. clavarioldes, Link A: Otto. A low, numerously 

 bran.li. 1. spnailiim |i],iiii. l-l^ft.high: joints rather 

 fra^'ih- aii.l -h 11.1. r. ' .. in. iliick, cylindrical or somewhat 

 clavate. lre.|iieiitly ..■iistat.-. with numerous terminal, 



gether, small, with white wo.. I: ^pim^ t in, -.m. liin.s 

 fewer, very small and appr.-s-.,l. «hii. : tl- I P in. 

 wide and twice as long, gn-im-h i..l; li. .Ihpii.al. 

 V,-%\n. long; seeds with woolly haiis. (_ hil. . - \ar. 

 cristata is offered. 



36. Salmiina, Parni. A numerously branched, up- 

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



