54 



THE CACTACKAE. 



spines; radial spines 8 to ,3, slender, the central one n.uch longer than a^^ 



cm 



Saked but the surface somewhat warty; seeds black, shining, minutely pitted, 2 mm. long, oblique 

 at bases. 



Type locality: Near Victoria, Mexico. 



Distribution: Eastern Mexico. 



The spines of seedlings are yellow. This specie: 



Garden in June 191 8. 



E. O. Wooton made a trip into eastern Mexico 



of a large Cephalocereus, presumably this species. 



plain and extended the known range of this species northwards. 



New York 



common on t 

 Mr. Wooton 



f^- 



Chamal Hacienda, about halfway between Matamoras and Tampico 



tweedyanus 



meters 



branched 



green when young, grayish green 



when young; radial spines several, 1.5 cm. long or less; central spmes often solitary, porrect, 2 to 

 3 cm. long; flowering areoles bearing long white wool; flowers 7 cm. long; inner perianth-segments 

 short, oblong, obtuse; scales and outer perianth-segments obtuse, purplish; fruit nearly globular, 

 about 4 cm. in diameter, reticulated. 



i. 



Figs. 78 and 79. — Cephalocereus tweedyanus. 



The species is based on two collections from widely separated localities in Ecuador, 

 one being from the Pacific coast near sea-level, and the other from east of the coast range 

 at an altitude of about 3,000 feet. The first was collected by J. N. Rose and George Rose 

 in thickets near Santa Rosa, Province Del Oro, October 18, 1918 (No. 23494, type), and the 

 other east of Ayapamba, same province, October 15, 191 8 (No. 23454). This is the first 

 species of Cephalocereus reported from Ecuador and is the most southern species known on 

 the west coast of South America. It is dedicated to Mr. Andrew Mellick Tweedy, who 

 assisted Dr. Rose in his Ecuadorean Expedition in 1918. 





