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OPUNTIA. 169 



come from Mexico. From the description it may belong to our series Dilleniaiuic, but we 

 are unable to associate it with any species known to us; the ovary is described as com- 

 pressed and tubercled. 



Opuntia anahuacensis Griffiths, Bull. Torr. Club 43: 92. 1916. 



A low, reclining or prostrate plant, up to 5 dm. high, 1.5 meters broad; joints obovate, glossy, 

 yellowish green, 27 cm. long, 13 cm, broad; spines yellow or becoming%hite, i or 2, porrect, flattened, 

 twisted, 2 or 3 cm. long; flowers yellow; style white; stigma-lobes 6, white; fruit dark purplish red, 

 pyriform, 7 cm. long. 



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Type locality: Anahuac, Texas. 



Distribution: Known only from the type locality, at the mouth of Trinity River, 

 eastern Texas. 



Opuntia megalantha Griffiths, Bull. Torr, Club 43: 530. 1916. 



A tall, erect, open-branching plant, 2 meters high or more; joints obovate, glaucous, grayish 

 green, 21 cm. long, 14 cm. broad; spines yellow, i to 3, or even 5 or 6 on old wood, the longest often 

 4 to 5 cm. long; flowers yellow, 10 to 11 cm. in diameter; petals 5 cm. long, obovate; style white; 

 stigma-lobes 8 or 9, white or tinged with green; fruit dark red. / 



Known only from cultivated plants received from the Berlin Botanical Garden, where 

 it was grown as Opuntia hergeriana. : ;. . . • 



Series 16. MACDOUGALIANAE. , - , . 



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Erect, mostly tall species, with flat, broad, "wlsi)^ ^^ / ^^ 



and thin, persistent joints, the epidermis, at least A^^^'^i^ 5^ 



that of the ovary, pubescent or puberulent. The "^ 4 ^ yL ^ ^ 



spines, when present, yellow. There are about j:^^ \i 

 half a dozen species, natives of central and . jZ^ \ ti ^ ^ 



cr.iifTno*.« Mexico. ' ^^ . ' -^ : ^ . X *^. 



Key TO SpECIESv : . -,^ '^ ^ ^ ^ ^ ^ 



Joints merely finely puberulent or ' ^^ ■ ^U vu ^ x "\ 



glabrous; spines 1.5 cm. long or " ; j v ^ 0(^ a ^ 



less; ovary velvety : . 184. 0. dtirangensis -A y V^ |\ *^ j^ 



Jointsdistinctly pubescent; spines ^ ^ ' 



2 to 3'cm. long. dg Ji ^2 '^ "^ 1^ 



Petals red. <^ ^ A W ' \^ ^S^ 



Style shorter than the petals 185. 0. airope$ -5^ & ^^ \ ^ n^ \ 



Style as long as the petals; 186. 0.a#«/5 > ^X^ *^ ^ A^ f%S 



Petals yellow. : ^ '7\^ -^ K ^ TS.X/'m 



Spines acicular, at first yel- 4 /K ^ \ ^ 

 low, soon white. ..... ... 187. 0. macdougaliana 



Spines subulate. / ^ ^ ^ :. ir; - 

 : Petals retuse;are6les of >.^ J: v^ 



» ovary many, approxi- ^^ ■ ■ ■ "^ v : 



mate. /. . . 188. 0. velutina :^ 



Petals mucronate; are- \„ ,: ^N^ * '^ 



oles of ovary few, dis- , /V. -^ ^ ^ 



tant. . . . . 189. 0. wikoxii ^ ,^^ ^ ^. 



184. Opuntia durangensis Britton and Rose, 



Smiths. Misc. Coll. 50:518. 1908. Fig. 208.— Opuntia durangensis. X0.4. 



Joints broadly obovate about 20 .^^^; J-^"^. . ^^^^rous areoles; areoles i to 



\ :Z S::f:^lZ'i"fi^7Z °; a?"^ aLl"?.'.' cm. U or less, pungent, spreading, 



petals broad, apiculate; ovary 3 to 4 cm. long, fi^^^y P"^^"^^,"^' '^ t"nar1 

 ous glochids and a few spines; fruit white or red; seeds about 3 mm. broad. 



Type locality: Near Durango, Mexico. 



Distribution: Central Mexico. ^ „ , • ,^,^ u„f t,^ a\a nnt rornrr! 



This species was collected by the late Dr. E. Palmer m ^9^^' ^^t he d.d not record 

 the size and habit of the plant. The joints suggest a large, bushy species. 



Figure 208 represents a joint of the type specimen. 



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