156 Ex. Doc. No. 41. 



w 



' This species appears to be allied to M 



guished by the conical heads, and the hemispherical tufts, while 



M. vivivara has hemispherical or 



flat and spreading masses. 



even depressed heads, and forms 



M 



It may be an undescribed species, in which case the name of 

 . aggregata appears to be most appropriate. 



2. Mammilaria^ October 26, 1846. Rare. 



Apparently a mammilaria^ though the habit of the plant is more 

 that of an echinocereusy but all echinocerei have the bunches of 

 spines disposed in vertical ridges, which is not the casein the figure 

 in question. Stems irregularly cylindrical, with divers contractions 

 and swelling, about 4— 6 inches high, and l|to 1| inches in diame- 

 ter, many (in the fig. 8) from one base. 



The name of M. fasciculata would indicate the peculiarity of 



this species. • 



3. Mammilaria^ ^^ November 4th, 1846, abundant." 



Several (fig. 3.) oval stems from one base, 1|— 2^- inches high, 

 and l\ inch in diameter; tubercles in about 13 rows; spines w^hitish, 

 short; 1 small obovate red berry toward the apex not more than Ig 



line long: 



If the figure is correct, this species ought to be distinguished bj 

 the name of M. microcarpa^ as I know of no other mammilaria 

 with such a small fruit. . 



4. Echinocacfus Wislizeni. (Engelm. in Wizlizenus's r^P?Iy 

 ^^ October 26th5 1846.''" In addition to the description in Dr. W.s 

 report, w^hich I have drawn up from dried specimens, I observe in 

 this figure that the species has 21 oblique ribs, is of an oval shape? 

 and bluish green color; the ribs are acute, but not compressed, ac- 

 cording to the representation of a section, and the groves corres- 

 ponding. ,j 



5. Echinocactus^ '^ October 25th, 1846, 18 inches in diameter- 

 Height equal to the diameter; shape ventricose, contracted towar s 

 the vertex, therefore somewhat urceolate; with 21 straight sharp 

 ribs; spines apparently 8, straight, brown, color of plant brig 

 green;, vertex whitish, (tomentose?) fruit 1 or 1| inches long, ova j 

 yellowish or reddish. Seed obovate, obliquely truncated at bas , 

 full 1 line long, black, opaque, slightly roughened; embryo curv^^ 

 or hooked, cotyledons accumbent, partly buried in the largeiari 



ceous albumen. ' • py- 



This species is distinct from all other New Mexican species ex 

 amined by me, and is most probably undescribed. I propose 

 name it after its zealous discoverer, who has, surmounting ^^^ . 

 less difficulties, though occupied by severe and arduous "^ f^ 

 found leisure to do so much for the advancement of our knowle g 

 of the wild countries traversed by him^ echinocacfus Ernoryt* 

 6. Cereus. «^ November 21st, 1^6, 3 feet high.'' . .^ 



There can b» but little doubt but that we have here a species 

 fore us, which I have received from Dr, Wislizenus and from ' 

 Gregg, from the neighborhood of Chihuahua, and which I have 

 qrribed in Dr. W's report by the name of C. GressH, erect, branc 



