THELOCACTUS. 7 
from northwestern Argentina, and Echinocactus insculptus, referred to below, although 
reported from Buenos Aires, is really of Mexican origin. 
Echinocactus insculptus Scheidweiler (Hort. Belge 4: 120. pl. 7. 1837) is referred here 
by Schumann, but the illustration indicates a very different plant. 
Echinocactus labouretianus, referred by Schumann (Gesamtb. Kakteen 438. 1898) to 
Cels’s Catalogue, probably never described, is to be referred here. 
Illustrations: Cact. Journ. 1: 181; Lemaire, Icon. Cact. pl. 4; Dict. Gard. Nicholson 
1: f. 690; Balt. Cact. Journ. 2: 196; Riimpler, Sukkulenten 182. f. 101; Knippel, Kakteen 
pl. 12; Amer. Gard. 11: 461; Blanc, Cacti 45. No. 508; Schumann, Gesamtb. Kakteen 437. 
f. 76; Watson, Cact. Cult. 105. f. 36; ed. 3. f. 25, as Echinocactus hexaedrophorus. 
Fic. 4.—Thelocactus rinconensis. Fic. 5.—Thelocactus phymatothele. 
2. Thelocactus rinconensis (Poselger). 
Echinocactus rinconensis * Poselger, Allg. Gartenz. 23: 18. 1855. 
Simple, globose or somewhat depressed, 6 to 8 cm. high, 12 cm. in diameter; ribs somewhat 
spiraled, strongly tubercled; tubercles more or less flattened laterally, somewhat angled; spines 
usually only 3, acicular, 1.5 cm. long; flowers white, 4 cm. long; inner perianth-segments lanceolate, 
acute. 
Type locality: Near Rinconada, Mexico. 
Distribution: Nuevo Leén, Mexico. 
We do not know this species definitely, but we suspect that the plant collected and 
illustrated by Safford as Echinocactus lophothele belongs here. 
Illustrations: Schumann, Gesamtb. Kakteen 433. f. 75; Schelle, Handb. Kakteenk. 
197. f. 130, as Echinocactus rinconadensis; (?)Ann. Rep. Smiths. Inst. 1908: pl. 3, f. 1, 
as Echinocactus lophothele. 
Text-figure 4 is reproduced from the first illustration cited above. 
3. Thelocactus lophothele (Salm-Dyck) Britton and Rose, Bull. Torr. Club 49: 251. 1922. 
2 Echinocactus lophothele Salm-Dyck, Allg. Gartenz. 18: 395. 1850. ~ 
Simple, or in its native state cespitose, globose, sometimes depressed or short-cylindric, up to 
25 cm. high, glaucous; ribs indefinite, strongly tuberculate; tubercles flattened; areoles depressed, 
* Because this species came from Rinconada, Schumann (Engler and Prantl, Pflanzenfam. 36a: 1809. 1894) has 
changed the name to Echinocactus rinconadensts. 
