154 



THE CACTACEAE. 



Type locality: Paraguay. 

 Distribution: Paraguay. 



We have not grown this plant, but Dr. Rose studied it in Berlin, in 191 2. 

 This plant is successfully grown as a graft on the top of some of the Cereus allies. 

 Illustrations: Bliihende Kakteen 2: pi. 101 ; Monatsschr. Kakteenk. 29: 67, as Echino- 

 cactus mihanovichii. 



Figure 159 is copied from the first illustration above cited. 



2. Gymnocalycium netrelianum (Monville). 



Echinocactus nelrelianus Monville in Labouret, Monogr. Cact. 248. 1853. 



Simple or sometimes proliferous, globular or somewhat depressed, 3 cm. in diameter, naked at 

 apex; ribs 14, broad, rounded, tubereulate, somewhat glaucous; spines 5 to 8, all radial, brownish, 

 setaceous, flexible, less than 1 cm. long; flowers pale citron-yellow, 5 cm. long; inner perianth- 

 segments broadly oblong, acute. 



Type locality: Not cited. 



Distribution: Probably Uruguay or Argentina, according to Schumann, but not 

 reported from the former by Arechavaleta or from the latter by Spegazzini. 



According to Dr. Weber, this species is very similar to E. hy ptiacanthus , but it is much 

 smaller and the flowers are yellow, not white. 



Illustration: Bliihende Kakteen 1: pi. 39, b, as Echinocactus netrelianus. 



Figure 160 is copied from the illustration above cited. 



3. Gymnocalycium leeanum (Hooker). 



Echinocactus leeanus Hooker in Curtis's Bot. Mag. 71 : pi. 4184. 1845. 



Globose or somewhat depressed, glaucous-green; tubercles hemispherical but usually 6-angled 

 at base, not definitely arranged; areoles oval; spines about 11, slender; radial spines somewhat 

 curved, appressed, 12 mm. long; central spine 1, straight, porrect; flowers large; outer perianth- 

 segments green, tinged with purple; inner perianth-segments pale yellow. 



Type locality: Argentina. 



Distribution: Argentina and Uruguay. 



This plant was originally obtained from Messrs. Lee, of the Hammersmith Nursery, 

 who grew it from seed sent by Mr. John Tweedie from Argentina. Schumann referred 

 it to Echinocactus hy ptiacanthus, a white-flowered species from which we believe that it 

 must be distinct. We have found no records of the rediscovery of this species, but we 

 are inclined to refer here J. A. Shafer's No. 123, collected at Salto, Uruguay, March 7, 

 1 91 7. This plant flowered in the New York Botanical Garden in 19 18 and has beautiful 

 yellow flowers. 



Illustrations: Curtis's Bot. Mag. 71: pi. 4184; Loudon, Encycl. PI. ed. 3. 1377. f. 

 19370, as Echinocactus leeanus. 



Figure 164 is copied from the first illustration cited above. 



4. Gymnocalycium guerkeanum (Heese). 



Echinocactus guerkeanus Heese, Monatsschr. Kakteenk. 21: 132. 1911. 



Usually simple but sometimes cespitose, about 5 cm. in diameter; ribs 9, broad and obtuse, 

 somewhat tubereulate; spines all radial, usually 5, unequal, the longest 12 mm. long, yellowish, with 

 brownish bases, rough, usually spreading or appressed; flowers near center of plant, 5 cm. long, 

 yellow, nearly as broad as long when expanded; inner perianth-segments narrowly oblong, acute, 

 sometimes toothed; scales on the ovary acute; fruit and seeds not known. 



Type locality: Bolivia. 

 Distribution: Bolivia. 



This species is said to be near E. netrelianus but apparently quite distinct. We know 

 it only from description and illustrations. 



