200 Plantce Lindheimeriana. 



Upper Missouri ; the only specimen I possessed was unfortu- 

 nately destroyed. — Mammillaria similis, Engelm. in Plant. 

 Lindh. I. c, first discovered by Mr. Lindheimer near the Bra- 

 zos, has since been found by him south of the Guadaloupe, 

 about New Braunfels and on the Pierdenales in several forms. 

 It has frequently flowered with me and annually produces 

 abundant fruit. I substitute the following character and 

 description. 



M. similis : subsimplex s. plerumque csespitosa ; tuberculis 

 ovato-cylindraceis supra plus minus sulcatis (sulco in juniori- 

 bus basin versus tomentoso saepe prolifero) axilla tomentosis ; 

 areola albo-tomentosa demum nuda ; aculeis 10-12 rectis 

 albidis, radiantibus tenuioribus sequalibus, centrali nullo s. 

 singulo robustiori ; floribus ex axillis tuberculorum hornoti- 

 norum subcentralibus s. demum lateralibus (flavis s. ex rubello 

 flavicantibus) ; sepalis petalisque lineari-lanceolatis acuminato- 

 aristatis ; sepalis 15-25 ciliato-fimbriatis ssepe plus minus 

 recurvis ; petalis 20-30 integris s. basi subciliatis ; stigmati- 

 bus 5-8 virescentibus supra stamina numerosissima exsertis ; 

 bacca obovato-subglobosa coccinea ; seminibus nigris subglo- 

 bosis scrobiculatis majoribus. 



a. cespitosa: gracilior ; aculeis radiantibus sub-12, centrali 

 subnullo ; sepalis 15-20; stigmatibus sub-5. 



$. kobustior: subsimplex; aculeis radiantibus sub-10, cen- 

 trali robustiori ; sepalis 20-25 ; petalis 25-30 ; stigmatibus 

 7-8. Flowers (at St. Louis) in May. — Stems l\ - 2| inches 

 high, obovate, of smaller diameter ; tubercles in a. 8, in i?- 

 often in 13 rows; spines 3-4, in /S. 4-8 lines long; central 

 spine, when present, 6 lines long. Grooves proliferous towards 

 the upper or the lower end. Flowers l|-2 inches long, and 

 of the same diameter when fully open, radiating like stars 

 with their pale yellow, silky lustre, giving this species a most 

 beautiful appearance when several open on the same morn- 

 ing: petals 12- 15 lines long and 2 lines wide. Berries 3-5 

 lines in diameter. 



