108 Mr. Haworth's Twelfth Decade of Neva Succulent Plants. 



torian, the judicious patience of a pliilosopliev, and the hand 

 of a master : and all this with a degree of success that ren- 

 ders every innovation dangerous, every improvement hazar- 

 dous, and every useful addition of very difficult accomplish- 

 inent. I remain, Gentlemen, 



Yours, &c. 

 Chelsea, Oct. 1829. A. H. Hawoiith. 



Ordo Nat. CACTE.E, DeCandolle Prod. Si/st. Veg. 3.457. 



Cactoidea Vent. Cacti Juss. exclus, Grossul. 



Opuntiace.'E Juss. Diet, exclus. Grossul. 



Cactus Linn. S;c. &;c. 



Trihvs O r u N 'J' ] A c E ^, Dccand. — Sanina parietalia. 



Genus Mammillaria Noh. Synops. Siicc. DcCand. Sj-c. — Cac- 

 tus Limt. S)-c. 



Cotijicdoncs 2, parvae. Flores parvi, diurni : fructus nudus ; et 

 (in paucis) pullulantes propagines ex mammillarum basi- 

 bus ; nunquam e spinarum fasciculis *, excepto fortasse in 

 M. vivipard Nutt. quae exinde monstrosa appareat. 



Suffjiitices carnosi, absque axe ligneo, &c. ut in Synops. Succ. 

 1. c. — Decand. Prod. &c. Flores albi, rosei, rubri. 



fnlvispina. M. (Globular tawny-spined) subrotunda : mam- 

 1. mis sub-13-spinosis : spinis sub-quatuor, cseteris plus 

 duplo longioribus, extimis horizontalibus. 



Obs. Planta nunc viget in Regio Horto Kewensi, 

 pomi mediocris magnitudine, sub-trientalis, floribus ru- 

 bris majusculis, fere ut in M. rliadanihu Otto, at forsan 

 majoribus, et spinis duplo longioribus; inferioribus albis 

 trilinearibus totam plantam fere tegentibus: sub-4-su- 

 perioribus patulis, caeteris 2-3-plo longioribus, fulvis. 

 Flores in hoc genere majusculi rubri apicales. 

 Habitat in Brazilia. Floret Sept. St. T^ . 



Genus Cereus, Mill. Diet. 1768. Cereus Nob. SyJiops. 

 Succ. 1812. et DeCand. Cat. Hort. Monspel. 1813. 



Cotylcdones nullae. Corolla magna, tubo longo squan)ato, e 

 spinarum fasciculis oriens : fugax, plerumque nocturna. 



Frufices aphylli carnosi, axe centrali ligneo durissimo, medul- 

 1am includente, floribus albis rubris luteisve. 



* Instead of these two words, I propose in future to employ the word 

 Spiiiariiim for tlic peculiar fascicles of spines in Cacteae, for which some 

 writer', w-c tlir teim Arm. 



* See/io 



