50 TH^ CACTACEAE. 



PUBLISHED SPECIES, PERHAPS OF THIS GENUS. 

 Mammillaria calochlora Hortus, Monatsschr. Kakteenk. 26: 167. 1916; 2 : 133. 1917. 



This seems undoubtedly a species of Coryphantha, but we have not been able to 

 identify it. There is considerable confusion regarding this plant, as the following note 

 from Meyer would indicate: 



"I have gotten Mr. Quehl to send me the flower of Mammillaria calochlora Hort. and I see that 

 this also agrees exactly with the flower of Grassner's M. delaetiana. As third and last I have now 

 gotten Mr. de Laet to send me also a little plant of equal size of his genuine M. delaetiana Quehl and 

 this one is entirely different from the two others in form and color of the body, areoles, and spines." 



We have a small specimen and a photograph sent us by L. Quehl in 192 1. 



Mammillaria cordigsra Heese, Gartenflora 59: 445. 1910. 



Short-cylindric, 6 cm. high, 4.5 cm. in diameter; tubercles 4-angled, broader than long, grooved 

 above; spine-areoles longer than broad; radial spines 4 to 15, white, spreading; central spines 4, 

 erect, curved if not hooked at apex, 15 mm. long; flowers and fruit unknown. 



Type locality: Not cited. 



Distribution: Doubtless Mexico. 



This species we know only from descriptions and illustration. The illustration is so 

 much like that of Mammillaria bombycina that we at first were inclined to combine them. 

 From the observations of others there seem to be important technical differences which 

 separate them, not only specifically but also generically. It may prove to be a synonym 

 of C. sulcolanata, for we have recently examined a skeleton sent us by Bodeker which 

 resembles very much the plants collected by Rose in Hidalgo, Mexico, which we have 

 already referred to that species. 



Illustration: Gartenflora 59: f. 50, as Mammillaria cordigera. 



Mammillaria cornuta Hildmann in Schumann, Gesamtb. Kakteen 496. 1898. 



Simple, grayish green, somewhat depressed, 4 to 5 cm. high, 6 to 8 cm. in diameter; tubercles 

 spiraled, in 5 to 8 series; radial spines 5 to 7, subulate, straight or somewhat curved, white, 4 to 8 

 mm. long; central spine solitary, horn-colored; flowers said to be rose-colored; fruit unknown. 



Type locality: Mexico. 



From the description it is difficult to identify this species; its rose-colored flowers 

 suggest a relationship with Coryphantha elephantidens but its spine-clusters are differently 

 . described. 



Mammillaria potosiana Jacobi, Allg. Gartenz. 24: 92. 1856. 



Erect, cylindric, light green; tubercles conical, triangular at base, bearing 2 yellow glands in 

 their axils; radial spines 15 or 16, subulate, equal or nearly so, 6 mm. long; central spine solitary, 

 porrect but somewhat incurved at apex, subulate, 10 to 12 mm. long; flowers yellow. 



Type locality: San Luis Potosi, Mexico. 

 Jacobi comments on the species as follows: 



"Comptroller Shafer in Miinster received this beautiful plant in a shipment of plants from 

 San Luis Potosi in Mexico, under the name of Mammillaria raphidacantha. From the given de- 

 scription it is adequately clear that the plant considered is another and undescribed one. The 

 form of the tubercles as well as the number and form of the spines is other evidence, also the grooves 

 upon the upper sides of the tubercles which are always present in the case of M. raphidacantha are 

 here lacking throughout. 



"The stem of the plant is cylindrical, dark green, finely punctate with white dots; tubercles 

 conical, 3-angled at the base, gradually flattened above; axils sinuate with 2 yellow glands, inclosed 

 by a ring of yellowish-white tcmentum ; areoles terminal, oval, the younger ones whitish tomentose, 

 later naked; radial spines 15 or 16, radiating, somewhat recurved, needle-formed, two-colored. In 

 older plants there appears here and there a longer and stronger central spine with the tip slightly 

 bent downward. All the spines are awl-shaped and stifl". 



