60 MISSOURI BOTANICAL GARDEN, 



ft Flowers hairy; style exserted; fruit hairy; 



plants covered with long hairs. 



V. Oreocereus A. Berg. 

 ** Ovary and tube naked or the ovary with some very 



short wool or a few stiff hairs. 

 t Flowers larger, greenish white; plants very tall. 



VI. Lepidocereus Engelm. 



ft Flowers small, reddish or brown; plants not 



gigantic. VII. Stenocereus A. Berg, 



b. Flowers campanulate. 



* Ovary and tube scaly, often hairy and setuliferous, 

 style short, deeply divided into numerous stigmata; 

 fruit woolly, setuliferous or prickly. 



VIII. Eulyciinia Phil. 



** 



i 



Ovary and tube with very few scales, naked; style 

 often much exserted, with short stigmata; fruit 

 smooth. IX. Pilocereus A. Berg. 



2. Flowers larger, more or less funnel-shaped; stamens gen- 

 erally very numerous, inserted along the tube in two groups, 

 the uppermost adnate at the base of the petals, radiating, 

 the lower ones free and declining. 



a. Flowers with a very few minute scales, soon falling off 



neatly above the ovary; fruit naked, crowned by the 

 remaining recurved style. 



X. Piptanthocereus A. Berg, 



b. Flowers with larger scales or hairs and bristles, perianth 



after flowering drying and finally deciduous or remain- 

 ing; fruit never naked. 



* Scales of ovary and tube f oliaceous, increasing in size 



with the growing fruit, in their axils neither wool, 



hairs nor spines; stems triangular, sarmentose, 



rooting. XI. Hylocereus A. Berg. 



** Scales of ovary and tube not foliaceous, always with 



wool, hairs or bristles, 

 f Tube of perianth with hairs or wool, but not 

 armed with bristles. 



X Ovary and tube without bristles, but more or 

 less densely covered with long curled hairs; 

 fruit not colored, unarmed, hairy. 



XII. Triciiocereus A. Berg. 

 J J Ovary often with a few spines and with 



copious white wool, also the tube woolly 

 , in the axils of the scales; fruit red, often 

 prickly, pulvilli more or less raised. 



XIII. Eriocereus A. Berer. 





