1 6 THE CACTACEAE. 



Illustrations: Bliihende Kakteen i : pi. 7; Schumann, Gesamtb. Kakteen 505. f. 83, 

 as Mammillaria rhaphidacantha ; Bliihende Kakteen 3: pi. 163; Monatsschr. Kakteenk. 22: 

 165, as M. radicantissima. 



Figure 14 is from a photograph of a plant collected by Dr. Edward Palmer at San 

 Luis Potosi, Mexico, in 1908 (No. 814). 



3. Neolloydia horripila (Lemaire). 



Mammillaria horripila Lemaire, Cact. Aliq. Nov. 7. 1838. 



Ecbinocactus horripilus Lemaire, Cact. Gen. Nov. Sp. 91. 1839. 



Echinocaclus horripilus longispiniis Monville in Labouret, Monogr. Cact. 265. 1853. 



Simple or somewhat cespitose, globular to short-cylindric, 10 to 12 cm. high; tubercles glaucous, 

 prominent, rounded at apex; radial spines 8 to 10, acicular, spreading, 15 mm. long, grayish; central 

 spine solitar}^, straight, a little longer than the radials; flowers deep purple, 3 cm. long; inner peri- 

 anth-segments narrowly oblong, acute; stigma-lobes 5, white. 



Type locality: Not cited. 



Distribution: Hidalgo, Mexico. 



Lemaire first referred this plant to Mammillaria, but finally described it as an Echino- 

 cactus on account of its grooved tubercles ; he believed that it was an intergrade between 

 these two genera. As he states, its general appearance is that of a species of the so-called 

 Mam.millaria. 



Echinocaclus caespititius Pfeiffer is usually given as a synonym of this species, but it 

 seems never to have been described. Schumann cites the place of publication as Salm- 

 Dyck's Cactaceae of 1850 (p. 35), but it is given only as a synonym. It appeared also 

 in Salm-Dyck's Cactaceae of 1845 (p. 17) and in Forster's Handbuch (p. 283), but also as 

 a synonym. 



Illustration: Bliihende Kakteen i: pi. 6, as Echinocactus horripilus. 



Figure 13 is reproduced from the illustration above cited. 



4. NeoUoydia beguinii (Weber) Britton and Rose, BuU. Terr. Club 49: 252. 1922. 



Echinocactus begninii Weber in Schumarm, Gesamtb. Kakteen 442. 1898. 

 Plant-body cylindric, 10 to 15 cm. high; ribs spiraled and divided at regular intervals into low 

 tubercles resembling geometric figures, pale bluish green in color but nearly hidden by the dense 

 covering of spines; radial spines 20 or more, white, but with dark tips; centrals usually single, longer 

 and ascending; flowers appearing from top of plant, large, 3 to 4 cm. long, bright pink; stigma-lobes 

 7, long, white; ovary without scales; seeds black, tubercled, with a broad triangular hilum. 



Type locality: Probably at Saltillo, in Coahuila, Mexico. 



Distribution: Zacatecas and Coahuila, Mexico. 



This plant is very distinct from Echinomastus erectocentrus, with which it was con- 

 fused both by Coulter and by Schumann. 



Mammillaria beguinii and Echinocactus beguinii Weber are referred by Weber (Diet. 

 Hort. Bois 466. 1896) as synonyms of Echinocactus erectocentrus. The Index Kewensis 

 (Suppl. 5) refers the former name to Schelle (Handb. Kakteenk. 200. 1907). The name E. 

 beguinii has been previously used in Rebut's Catalogue and by Schumann (Montasschr. 

 Kakteenk. 5: 44. 1905), but not described. 



5. Neolloydia ceratites (Ouehl). 



Mammillaria ceratites Quehl, Monatsschr. Kakteenk. 19: 155. 1909. 

 Simple or in small clusters, short-cylindric, 6 to 10 cm. high; tubercles somewhat 4-angled, 

 more or less arranged in ribs; young areoles very woolly but becoming naked; radial spines 15 to 

 20, more or less spreading, white, 1.5 cm. long; central spines 5 or 6, longer and stouter than the 

 radials, blackish above; flowers pinple, 3 to 3.5 cm. long; perianth-segments oblong, acute. 



Type locality: Mexico. 



Distribution : Mexico . 



Illustration: Monatsschr. Kakteenk. 19: 155, as Mammillaria ceratites. 



Figure 16 is from a photograph of the type plant sent us by Mr. Quehl. 



