176 THE CACTACEAE. 



Echinocactus arachnoideus Scheidweiler, Bull. Acad. Sci. Brux. 6 1 : 90. 1839.* 



Ovoid, 7.5 to 10 cm. long, 7.5 cm. in diameter; ribs 9 or 10, rounded, somewhat gibbose between 

 the areoles, separated by acute intervals but these disappearing below; radial spines 10 to 12, 

 spreading, equal, 1 cm. long; central spines 4, stouter than the radials, purplish at base; flowers and 

 fruit unknown. 



Echinocactus aranEolarius Reichenbach in Terseheck, Suppl. Cact. Verz. 2. 



Oblong, obtuse; ribs 12; areoles prominent, white-lanate ; radial spines 15 to 17, spreading, 

 slender, straight, yellowish; central spines 5 to 7, porrect, very short, purplish; flowers and fruit not 

 known. 



According to Walpers (Repert. Bot. 2: 317. 1843) the species came from Montevideo. 



Echinocactus armatissimus Forster, Hamb. Gartenz. 17: 162. 1861. 



"Normal specimens, which are before me, are an original stalk and a cutting raised therefrom. 

 The first is 10 inches high, by 3^ inches in diameter, brownish green, lighter colored toward the 

 crown, and is 14-ribbed. Ribs are rounded, furrowed rather deep, almost sharp, the areoles not far 

 apart, sparsely covered with short gray wool, and not very deep. Spines: pearl gray, stiff, straight; 

 radial spines: 9 to 11, spreading, extended, very dissimilar, 4 to 10 lines long; central spines: only i, 

 stiff, upright, 1 ) 2 to i3 4 inches long. 



"The cutting on the other hand is 1 inch high, by 1^2 inches in diameter, light green, and 

 only 1 1 ribbed. The ribs, furrows, and areoles are like the original stalk. The spines upon the crown are 

 brown, the rest pearl-gray. Radial spines: only 7 to 8, radiating, extended, 3 or 4 of the lower are 

 longer (up to 9 lines long). Central spines: likewise only 1, upright, stiff, and up to 10 line? long. 



"This belongs to the Cephaloidci and because of its strong spreading bundles of spines pre- 

 sents a peculiarly interesting aspect. Country: Peru and Colombia." 



The above is a free translation of Forster' s original description. We are not able to 

 identify the plant. Schumann (Gesamtb. Kakteen 313. 1898) associates it with Echino- 

 cactus ceratistes but the descriptions of these two species do not read much alike. 



Echinocactus chrysacanthion Schumann, Gesamtb. Kakteen 396. 1898. 



Usually simple, globose to short-cylindric, 5 to 6 cm. high, 5 cm. in diameter; ribs spiraled, 

 tubercled; spines 30 to 40, setaceous, golden yellow to brown, 1.4 cm. long, straight; flower yellow, 

 17 to 18 mm. long; ovary naked. 



Type locality: Province of Jujuy, Argentina. 



Distribution : Known only from the type locality. 



Schumann placed this species between EcJiinocactus minusculus and E. microspermus. 

 From the description we judge that it is near the former species. We know it only from 

 description. It may belong to Rebutia. 



Echinocactus cupulatus Forster, Hamb. Gartenz. 17: 161. 1861. 



We do not know this species. It is supposed to have come from Chile. 



Echinocactus cuprEaTus Poselger in Forster, Handb. Cact. ed. 2: 602. 1885. 



This species was described without flower and fruit and we are not able to suggest its 

 relationship. Schumann discusses it briefly under E. nigricans; it is also Chilean. 

 The name was listed in Seitz's Catalogue. 



Echinocactus depressus De Candolle, Prodr. 3: 463. 1828. 



Subglobose, depressed at apex; ribs 20, somewhat tuberculate; radial spines 10 to 20; central 

 spines 3 or 4; flowers and fruit unknown. 



This plant from tropical America has never been identified. De Candolle cites 

 Melocactus (?) depressus Salm-Dyck, as a synonym, and also refers here with a question 



* Although we have never seen the reprint, this paper by Scheidweiler was repaged and issued separately, judging 

 by references to it by Walpers (Repert. Bot. 2: 323. 1843) and Hemsley. According to Scheidweiler this plant came 

 from Buenos Aires but Walpers and Hemsley refer it to Mexico. Schumann did not know it. 



