ECHINOCEREUS. 33 
At first simple, stout, a little higher than broad, about 10 cm. high, but in cultivation elongated, 
20 cm. high or more, branching, very deep green, becoming turgid and flabby; ribs 5 to 7, more 
prominent towards the top of the plant, sometimes strongly tuberculate, at other times only slightly 
sinuate; areoles minute, white-felted, 5 to 6 mm. apart; spines 1 to 3, weak, 3 to 6 mm. long, yellow; 
flowers pinkish, 2.5 to 3 cm. long; perianth-segments spreading, oblanceolate, acute; style cream- 
colored; fruit not known. 
Type locality: Not cited. 
Distribution: Mexico, but range unknown. 
The origin of this species is unknown but it is supposed to have come from Mexico. 
It is not uncommon in European collections and Dr. Rose studied it in Berlin in 1912. 
At one time we had it in our collection but it has since disappeared; otherwise the plant is 
known to us only from the descriptions and illustrations. 
This species is doubtless named for Karl Knippel, a well-known dealer in cacti. 
Illustrations: Schumann, Gesamtb. Kakteen f. 47; Monatsschr. Kakteenk. 5: 170; 
Bliihende Kakteen 1: pl. 12; Schelle, Handb. Kakteenk. 120. f. 54; Balt. Cact. Journ. 
2: 215, 228. f. 3; Kirtcht, Kakteen Zimmergarten 57. 
Figure 38 is copied from the third illustration above cited. 
‘S43. Echinocereus pulchellus (Martius) Schumann in Engler and Prantl, Pflanzenfam. 3%: 185. 1894. 
Echinocactus pulchellus Martius, Nov. Act. Nat. Cur. 16: 342. 1828. 
Cereus pulchellus Pfeiffer, Enum. Cact. 74. 1837. 
Echinonyctanthus pulchellus Lemaire, Cact. Gen. Nov. Sp. 85. 1839. 
Echinopsis pulchella Zuccarini in Férster, Handb. Cact. 363. + 1846. 
Stems obovate-cylindric, 5 to 7 cm. high, simple, glaucous; ribs 12, obtuse, more or less divided 
into tubercles; spines 3 to 5, short, straight, deciduous, yellowish; flowers rosy-white, about 4 cm. 
broad; innér perianth-segments lanceolate, acuminate. 
Fic. 39.—Echinocereus Fic. 40.—Echinocereus amoenus. 
pulchellus. 
Type locality: Pachuca, Mexico, fide Pfeiffer. 
Distribution: Probably central Mexico. . 
This species is known to us only from descriptions and illustrations, but it seems 
quite distinct. . - 
Illustrations: Nov. Act. Nat. Cur. 16: pl. 23, f. 2, as Echinocactus pulchellus; Blithende 
Kakteen 1: pl. 33; Monatsschr. Kakteenk. 26: 177. 
Figure 39 is copied from the first illustration above cited. 
44. Echinocereus amoenus (Dietrich) Schumann in Engler and Prantl, Pflanzenfam. 3°: 185. 1894. 
Echinopsis amoena Dietrich, Allg. Gartenz. 12: 187. 1844. 
Echinopsis pulchella amoena Forster, Handb. Cact. 364. 1846. 
Cereus amoenus Hemsley, Biol. Centr. Amer. Bot. 1: 540. 1880. 
Echinocereus pulchellus amoenus Schumann, Gesamtb. Kakteen 253. 1897. 
