Plantce Lindheimeriance. 195 



little longer than the calyx-tube, three-cleft at the apex ; 

 stigmas fleshy, dilated, granulose-fimbriolate. Ovary three- 

 celled, many ovuled. Berry, pulpy, " deep red when ripe, 

 an inch or more in diameter," globose, ripening few seeds. 

 Seeds 3 lines long, roundish-oval, turgidly lenticular. — Si- 

 cydium was founded by Schlechtendal on a small-flowered 

 Mexican dioecious plant, of which the sterile flowers alone are 

 known. Until the fruit of that plant is identified it must 

 remain doubtful whether ours belongs to the same genus. 

 This has larger blossoms, and a more elongated calyx. But it 

 accords with Schlechtendal's incomplete description in being 

 dioecious, in the 5-petalous corolla, and in the three distinct 

 stamens with straight anther-cells. The leaves vary in the 

 depth and breadth of their lobes. From the Rio Grande, 

 Mr. Wright has communicated fragmentary specimens of 

 what is probably a variety of the same species, with the 

 leaves dissected into linear or filiform lobes and segments. 



Cactace.£; by Dr. Engelmann. 



*** Mr. Lindhcimer has again sent many living specimens of Cactaceae from 

 New Braunfels, San Antonio, the Pierdenales, and the Liano. Among them I not 

 only recognized all the species described in Plant. Lindh. (Boston Journal, Vol. V.) 

 but found also a number of new forms. From other sources I have obtained other 

 species from the lower Rio Grande. All these will be enumerated here in order to 

 complete, as far as possible, the catalogue of the Texan Cactaceae. A correspon- 

 dence with Prince Salm Dyck, than whom none is better acquainted wilh these 

 curious plants, and his examination of living specimens of most of the species ena- 

 bles me to give this revision an authenticity not otherwise attainable. 



MAMMILLARIA. 



§ 1. Fructu viridi, ovali ; corolla persistente ; testa seminum 

 pergamentacea fusca ; jloribus ex axillis tuberculorum 

 hornotinorum. 



M. calcarata (M. sulcata, Engelm. PI. Lindh. I. c, non 

 Pfeiffer). Near M. scolymoidcs, Schdw. but sufficiently dis- 

 tinct, according to Prince Salm. — Rocky and hard, clayey 



