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DESCRIPTIONS AND ILLUSTRATIONS OF PLANTS OF THE 



CACTUS FAMILY. •, 



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Tribe 3. CEREEAE. 



««H ^^^^^"^^fo^^jfs^ fleshy terrestrial or epiphytic, simple and i-jointed or much branched 

 and many-jomted, the jomts globular, oblong, cylindric, columnar or flattened and winded or 

 Y^^^' often strongly ribbed, angled, or tubercled; leaves* usually wanting on the ioTn^sHn I 

 few cases developing as scales) but usually developing as scales on the o v^ or perianth tube -are 

 oles never producing glochids; spines usually present (rare or wanting in^t epiph^^^^^^^^ and 



ffo^erTsSrmost'^^^^^^^^^ ^^^°^' ^'^V^'".-> arrangeLnt, and s^z^nevef sheathT^ 



nowers sessile, mostly with a definite tube, various in size and shape in different eenera usuallv 



fn t^Z a Creoles, opening at various times of the day; perianth campanulate, fSmelforroV ro^^^^ 

 fruit usually a fleshy berry, but sometimes dry and dehiscing by a basal por^ (in i soeJies bv an 



Slf ;^i?etnobr"" ^"'"' '^^"" ^^ '^^^'' -^^' ^ ^^^^ -' ^^ ^' less^rit^t^stTrcotyleL^s 



This tribe contains most of the genera and three-fourths or more of the species of 

 Cactaceae. It has a wider range in structure of stems and flowers than is exhibited by the 

 other tnbes the species being grouped in many genera. The first two subtribes are 

 treated in this volume. - • 



Key to Subtribes. 



Perianth funnelform. salverform, tubular, or campanulate ; sfegments several or many 



Areoles mostly- spme-beanng; joints ribbed, angled, or tubercled, very rarely flaf mostly 



terrestnal cacti. ' "'"='"> 



Flowers and spines borne at the same areoles. 



Several-jointed to many-jointed cacti, the joints long 



Erect, bushy, arching, or diffuse cacti /- - 



Vine-like cacti, with aerial roots. ... ■ '• ^/7«««« • 



One-jointed or few- jointed cacti, the joints usually short, sometimes clustered "ribbed ''' " ^^''"''"'"''' 



or rarely tubercled. ' ^'""'-^> 



Flowers at lateral areoles j, , . 



Flowers at central areoles (See Gymnocalyciumj '.'.'. ^ ' -^^f ."^^^''f ««« 



Flowets and spines borne at different areoles; short, one-jointed cacti ^' ^^'""''^"'^'""^'^ 



Flowering areoles forming a central terminal cephalium c CnHn^n. * 



Flowering areoles at the bases or on the sides of the tubercles i* rlZ ,1. 



Peri."^tw''. T'^^ spineless; joints many, long, flat; perianth mostly funnelform;' epiphytic cJcVi ^ EpitohvZZT' 

 Perianth rotate, or nearly so; segments few ; mostly spineless, epiphytic, slender. mknHointed cacti '. 8. RUpsaUdanac. 



Subtribe I. CEREANAE. 



Erect, bushy or sometimes diffuse, stout or slender cacti, the stems and branches several - 

 jointed to many-jointed, usually very spiny, none epiphytic but species of 2 or 3 genera giving off a 

 few roots when the branches touch the ground; flowers i or rarely several from the uppef par? 

 of old areoles; in some genera the flowering areoles and their spines greatly modified flowers 

 either diurnal or nocturnal, various in size, color, and shape ; stamens nume^rousborn; on the 

 flower-tube; fruit smooth or spiny, usually fleshy, often edible; seeds various. 



We group the species known to us in 38 genera. 



Key to Genera. 



A. Flowers solitary at the areoles, mostly large. 



B. Perianth funnelform, salverform, pyriform, or campanulate; limb relatively large 

 C. Ovary naked, or rarely bearing a few scales, which sometimes subtend tufts 



of short hairs. 

 Perianth funnelform, elongated. 



Columnar cacti, or with columnar branches; perianth falling away by 



abscission ^ r . 



vSlender, elongated cacti; perianth withering-persistent ^^V.y.l^^ 2 Monvillfafl ^T^ 



Perianth short-campanulatc or short- funnel form to pyriform; columnar ' 



. ■ ■ • 3- Cephalocereus (p. 25) 



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