OPUNTIA. 



J'^ 



113 



somewhat 



An Optintia collected by H. Piti 

 of the U. S. Department of Agricu 

 Opuntia triacantha, but is much out 

 important respects. The joints are 

 with purple blotches below the ar 



bearing short white hairs; spines usually wanting, but cultivated specimens bear a single 

 short soine 6 to 7 mm. lon2^ from an 



small 



margm 



> 



^ 



Fig. 140. — Opuntia triacantha. 



101. Opuntia jamaicensis Britton and Harris, Torreya ii : 130. 191 1. 



Erect, I meter high, with a short subcyhndric trunk; branches several, ascending, joints dull 

 green, obovate, much narrowed at base, flat, rather thin, readily detached, 7 to 13 cm. long, 5 to 

 7.5 cm. wide; areoles about 2.5 cm. apart; spines i to 5, usually only 2, acicular, unequal, white, 

 2.5 cm. long or less; flowers 4 cm. broad; petals 16 to 18; filaments greenish white; style white; 

 stigma-lobes 7 or 8, creamy white; fruit pyriform, red, 3.5 to 4 cm. long; seeds 4 mm. broad. 



Type locality: 



Distrihut 



ine, Jamaica. 



L of Spanish Town, Jamaica. 



from oaintines by Miss H. A. Wood 



figure 



figure 4, shows a fruiting joint ; figu 



I 



third natural size ; figu 



figures s and 6 show the stamens 



101a. Opuntia guatemalensis sp. nov. (See Appendix, p. 218.) 

 102. Opuntia tuna (Linnaeus) Miller, Card. Diet. ed. 8. No. 3. 



Cactus tuna Linnaeus, Sp. PI- 468. i753- 

 Cactus humilis Haworth, Misc. Nat. 187. 1803. 



/^>,.,.-J.■ J. :l.- TT il- c> T>1 c..^^ 



1769. 



JULIUS numins nawortn, iviisc. xNtiL. lo/. •" 

 Opuntia humilis Haworth, Syn. PI. Succ. 189. 18 12. 

 Opuntia polyantha Haworth, Syn. PI. Succ. 190. 1812. 

 Cactus polyanthos Sims, Curtis's Bot. Mag. 53= Pl- 2691- 

 Opuntia multiflora Nicholson, Diet. Gard. 2: 503- 1885. 



1826 



. riants 6 to 9 dm. high or less; ]omts usuaiiy smau, uuu o^xx.^w..... T,:" ,tp fncrarinns- areolec 

 to oblong, light g?een, exclpt above the areoles and there brownish ; l^^f^.^.^^'^^^^^i^^^^fl^^^^^^^ 

 arge; spinesi to 6, usually only 3 to 5. slightly spreading, light xf ^^^ ' ^'f^^^f^^^ 

 5 cm. broad: senak nrhionlar. vellowish. with a purple stripe along the center, petals ugni yeiiow, 



