178 THE CACTACEAE. 
Variety mebbesii Hildmann (Schumann, Gesamtb. Kakteen 413. 1898) is said to have 
more spreading, stouter, and lighter-colored spines and is more inclined to sucker than the 
typical forms. Other names associated with this species are the following: E. odiert 
spinis nigris Labouret (Monogr. Cact. 248. 18 53) and E. odieri magnificus Hildmann 
(Monatsschr. Kakteenk. 5: 184.1895). It is said to have a very large flower as compared 
with the size of the plant. 
ECHINOCACTUS PACHYCORNIS Miihlenpfordt, Allg. Gartenz. 14:371. 1846. 
Depressed; ribs 7, thick, obtuse; areoles 18 mm. apart, radial spines 5; central spine 1; spines 
all reddish except the uppermost one and this horn-colored ; flowers and fruit unknown. 
Type locality: Mexico. 
This seems to be only a juvenile plant of which all record is lost. 
ECHINOCACTUS PULVERULENTUS Miihlenpfordt, Allg. Gartenz. 16:9. 1848. 
Green, ovate or oblong-ovate; ribs 13, obtuse; areoles 4 mm. apart, grayish woolly; radial spines 
6 or 7, stiff, 4 to 5 mm. long; central spine 1, 114 cm. long. 
Type locality: Bolivia. 
Both Miihlenpfordt and Schumann considered this species related to Echinocactus 
ceratistes, but it surely must be very different, judging from the brief description. 
ECHINOCACTUS SPINA-CHRISTI Zuccarini in Pfeiffer, Enum. Cact. 59. 1837. 
Globose, 15 cm. in diameter, dull green; ribs 13 or 14, acute, crenate; areoles large, oval, 15 or 
20 mm. apart, when young white, velvety; spines stout, rigid, curved, black when young, paler at 
base, becoming yellow; radial spines 6 to 8, the lower spines stouter than the upper, 3.5 cm. long; 
central spine solitary, erect; flowers and fruit unknown. 
Type locality: Southern Brazil. 
To this species Pfeiffer referred E. fischeri asasynonym. Schumann lists it among the 
species unknown to him and afterwards (Gesamtb. Kakteen 468. 1898) under Melocactus 
ferox Pfeiffer, following Forster (Handb. Cact. 519. 1846). 
Here also both Forster and Schumann refer Echinocactus armatus Salm-Dyck (Hort. 
Dyck. 341. 1834), a reference we very much question. Labouret (Monogr. Cact. 16. 1853) 
whe. takes the same view of this species says it is native of Mexico coming from Santa Rosa 
e Toliman. 
Melocactus spina-christi Cels (Forster, Handb. Cact. 279. 1846) was never described 
but doubtless belongs here. 
ECHINOCACTUS SPINIFLORUS Schumann, Gesamtb. Kakteen Nachtr. 88. 1903. 
Usually simple, globose to cylindric, up to 6 dm. high, 1.5 dm. in diameter; ribs 20 or more, I 
to 1.5 cm. high; areoles circular, 4 to 5 mm. in diameter or near the crown of the plant 8 mm. in 
diameter, at first white-tomentose but in age naked; spines 14 to 20, spreading, straight, stiff, 
subulate, reddish yellow, unequal, the longest 2.5 cm. long; flowers 4 cm. long, 3.5 to 4 cm. broad, 
campanulate, rose-red; outer perianth-segments 8 mm. long, thin, spine-tipped; inner perianth- 
segments somewhat diverse, the outermost ones spinescent, the innermost ones not armed; stamens 
about two-thirds the length of the perianth; style about one-half the length of the longest stamens, 
surrounded at base with yellow wool; stigma-lobes 19; ovary turban-shaped, covered with awl- 
shaped prickly-tipped amber scales, these woolly in their axils. 
Type locality: On Cerro Morro or Cerro Bianco. 
Distribution: Argentina. 
We know this species only from description and we are in doubt as to the relationship. 
It must, however, be excluded from Echinocactus and Malacocarpus and probably does not 
belong to the sub-tribe Echinocactaneae. According to Dr. Vaupel, the type can not be 
found in the herbarium of the Botanical Garden at Berlin, and the collector is unknown. 
