Joints do not fall off and there are no joints scattered under plants. End joints 7-10 mm. in diameter. Fruits do not grow in chains. End joints short and very easily dislodged. May be joints scattered around underneath plant.
Fruits grow in chains.
End joints longer and may be dislodged but not as easily. End joints 3-5 mm. Plant less than 1 m. high. May have red fruit. Small round cactus.