IJO 



THE CACTACEAE. 



Mexico 



tc XXV, figure i, shows the top of a plant received from the Missouri Botanical 

 in 1904, which flowered in the New York Botanical Garden, June 23, 1915; figure 

 a flowering piece of a plant sent to the New York Botanical Garden from Guaymas, 

 by Dr. Rose in 19 10. Figures 241 and 242 show flowers of a plant collected by Dr. 

 MacDougal at Torres, Sonora, in 1902. 



2. Rathbunia kerberi (Schumann) Britten and Rose, Contr. U. S. Nat. Herb. 12: 415. 1909. 



ffrn<5 ^crJfr/* Schumann, Gesamtb. Kakteen 89. 1897. 

 Chistocactus kerberi Gossclin, Bull. Mens. Soc. Nice 44: 33. 1904. 



Columnar, somewhat branched, 2 meters high; ribs 4, compressed; radial spines about 16, 

 subulate; central spines 4, stouter than the radials, 4.5 cm. long; flowers 12 cm. long; outer perianth- 

 segments linear-lanceolate, rose-colored, reflexed; stamens exserted; scales on the ovary lanate in 

 the axils. 



Type locality: On Volcano of Colima. Mexico. 



Distribution: Known only from the type locaHty. 



A 



herbarium 



tion. 



from 

 specimens with it from 



and Tepic, Mexico, which now appear better referable to Rathbunia alamosensis, although 



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specimens (8 to lo cm. Ions:) and somewhat 



ARROJADOA 



) Stems low, much~branched, cylindric; roots flbrous; ribs numerous, low, straight; areoles close 

 igether, bcarme small acicular seines: flowers Hinrtipl Kr,t-no \r. o ^c^^,.a^ — t,„i:.° „4- ^t,„ ^ s 



Hndric 



(Melocactu 



/included; fruit a small, oblong, naked, juicy berry; seeds small, black. 



pecuUar 



taxonomic 



The original reference of its two 



fruit are quit( 

 ; resemblance 



form 

 terminal pseudocephalium 



most characteristic, for instead of remaining as a permanent crown of the plant it forms 

 lateral collar for the new joint which is projected through its center 



T. . ^A^'T'S^ '" i^ ^''''''' °^ ^'' ^^^^"^^ Arrojado Lisboa, the present superintendent 

 listrada de Ferro Central de Brazil, to whom Brazil is indphtpH fr^r i\.. ...fo^cN.o K^fo„,v 



semiarid rerions made 



reus rhodanth 

 \ 



Key to Species. 



Branches short and thick, 2 to 4 cm. in diameter a i , n 



Branches long and slender, i to 1.5 cm. in diameter .'. '. \V/.'.'.'.'.'.'.'.'.'.'.'.V.'.[\ l' ^^ 'tSuUa 



1. Arrojadoa rhodantha (Gurke). 



Cereus rhodanlhus Gurke, Monatsschr. Kakteenk. 18: 69. 1908. 



cvliiiddc ' 2 to^'cm In'^lil?^; ^^ %'^ ''f*' afterwards branching and clambering; joints short, 

 cm apTr't spines at f^rsf w!^'-" '° 1° '^' 1°^= ^^^°^^^ small, approximate, usually less than i 

 Unieer^ v'^ien youn^ IccornZ ie'd h""^' ""^^ "' '^' ^'"'''^^ °"^^ ^""^^^^ to the radials except a little 



lonfUwn; Ze?sXTy"a 'he^lTr LTcLT'^;"'" '^^"I 'f ^^^^%^^ ^^^^ ^^^^ ^^ '''' ^^^"1 

 branches nink ri<nri , to , .„, 1 ^^ areoles, formmg m clusters of 12 to 14 at the tops of 



perbntl^^^^^^^^ ^^^'^ ^"'^ ^"^^^'^ P^'-t of tube naked; uppermost scales and 



fern long ' • '^''"'"' numerous, included; fruit red, oblong to obovate, about 



Type locality: Caatinga de Sao Raimundo, Piauhy, Brazil. 



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