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. Beige 4: 120. pi. 7. 1837) is referred here 

 by Schumann, but the illustration indicates a very different plant. 



Echinocactus labour etianus, referred by Schumann (Gesamtb. Kakteen 438. 1898) to 

 Cels's Catalogue, probably never described, is to be referred here. 



Illustrations: Cact. Journ. i: 181; Lemaire, Icon. Cact. pi. 4; Diet. Gard. Nicholson 

 i: f. 690; Bait. Cact. Journ. 2: 196; Riimpler, Sukkulenten 182. f. loi; Knippel, Kakteen 

 pi. 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. 



Fig. 4. — Thelocactus rinconensis. 



Fig. 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 Leon, 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: pi. 3, f. i, 

 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. 



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: 189. 1894) has 

 changed the name to Echinocactus rinconadensis. 



