1 * 



64 MISSOURI BOTANICAL GARDEN 



Gigantic species. Some of these were wrongly included 

 under Pilocereus. Similar to Lepidocereus, but easily 

 distinguished by flower and fruit. 



Cereus (Pachycereus) Pringlei Wats. I.e. 71. — Sonora, Calif omia, etc. 



C. (Pachycereus) pecten aboriginum Engelm. 1. c. 75. — Mexico, 



Sonora, Baja California. 



C. (Pachycereus^ Thurberi Engelm. 1. c. 73. — Sonora, North Mexico. 



C. (Pachycer eu$) fulviceps (Web.) A. Berg. 1. c. 176. — Mexico. 



C. (Pachycereus) Orcuttii Kath. Brand. 1. c. Nachtr. 24. — Baja Cali- 

 fornia. 



(7, Thurberi Engelm. (Cact. Bound. 44) 



by 



C. Prinalei than to O 



Th 



The flowers of C. P 



dense velvety yellowish tomentuin. They are very unlike 

 all other cactus flowers. The fruit of C. Pringlei is 

 covered with a great number of neat balls of wool, which 

 are somewhat deciduous. In C. pecten aboriginum the 

 spines are more persistent, and for this reason the natives 

 use them as hair brushes. 



The drawing of the flower of C. Pringlei was prepared 

 from a specimen kindly sent me by Herrn Geheimrat Prof. 

 Dr. A. Engler, Director of the Eoyal Botanic Garden 

 and Museum, Berlin. 



V. OREOCEKEUS A. Berg. 



Ovary roundish, like the tube covered with fleshy acute imbricated 

 scales, with long woolly hairs from their axils; sepaloid perianth 

 leaves narrow, acute, petaloid ones narrowly spatulate, slightly 

 expanded; stamens very numerous, inserted along the tube and at the 

 bottom of it, as long as or longer than the petals; style much exserted, 

 with about 8 short stigmata. Fruit globose, scaly and hairy (dried 

 remains of the perianth persistent ?). — Plate 2. 



Cereus (Oreocereus) Celsianus (Lem.) A. Berg. 1. c, 180. — Andes of 



Bolivia. 



Oreocereus forms part of the old genus P 



L 



