Addisonia S 



(Plate 83) 



A. GYMNOCALYCIUM MULTIFLORUM 

 Many-flowered Gymnocalycium 



Native oj Argentina 

 Family Cactacea^ Cactus Family 



Echinocactus muUiflorus Hook. Bot. Mag. pi. 4181. 1846. 

 Gymnocalycium muUiflorum Britton & Rose. 



Plants solitary" or growing in clumps up to 10 individuals, each one 

 and one half to five inches in diameter, usually globose but sometimes 

 depressed or short-cylindric. The ribs are ten to fifteen, broad and 

 rounded, with low tubercles, each with a small chin below its spine- 

 cluster; the areoles are only a few to each rib, elliptic, sometimes 

 two fifths of an inch long; the spines are five to ten in a cluster, all 

 radial, yellow, sometimes brownish or reddish at base, subulate, 

 spreading, often recurved, the longest sometimes over an inch long. 

 The flower-bud is ovoid, and covered with imbricate scales; the 

 expanded flowers are short-campanulate, pinkish to nearly white; 

 the scales on the calyx-tube are broad, rounded, naked in their axils. 

 The stamens and style are included; the stigma-lobes are white, 

 linear. 



The plant here illustrated is a small specimen received from the 

 Berlin botanical garden in 1901, which flowered in the New York 

 Botanical Garden, June 1, 1913. The cluster of spines is from a 

 specimen collected by J. N. Rose in Argentina in 1915. The species 

 has been reported from Brazil and other South American countries, 

 but is doubtless restricted to northern central Argentina, where the 

 writer collected it on the high grassy plains of Cordoba in 1915. 



J. N. Rose. 



Explanation op Platr. Fig. 1. — Flowering plant. Fig. 2. — Portion of a 

 rib, showing an areole and a cluster of spines. 



B. GYMNOCALYCIUM MOSXn 

 Most's Gymnocalycium 



Native oj Argentina 

 Family Cactaceab Cactus Family 



'Echinocactus Moslii Giirke, Monatsschr. Kakteenk. 16: 11. 1906. 

 Gymnocalycium Mostii Britton & Rose. 



Plants solitary, one and one half to three inches high, five inches 

 or less in diameter. The ribs are nine to fourteen, broad and obtuse; 



