413 ly united into a very short tulDe e.t the base 



2 , ^'o^hytum 



16. Cei;;r!c vath 8 distinct membrpnous tube ebove the ovfiry 



petals united belovr into a. distinct tube. Sach 



body of the pl«=nt Globose, obconic , ovoirl. or oblong, 



entire, notched or distinctly 2-lobecl r?t the top, 



v.'ith e smell closed orifice p.t the centre of the top 



or between the lobes, not pariulose 1, Gonophytum 



Calyx: lobed do^/m to its union V'ith the overy (no 



tube); petrls free. The plant or each division of it 

 somewhat obconic, flat or slightly convex at the to]-'- 

 with a transverse fissure all across it (v;hen 

 adult), dividins" it into tv/o short truncate lobes 



3, Lithops 



17. Cel^T-x subequally 5-9-lobed; petals free; stigmas and 



cells of the ovary 8-15. Sach plant or division of 

 it globose, obconically sub-globose or oblong-ovoid, 

 formed of two short, thick equal or sub-equal leaves 

 Y.rith their flat faces closely/ pressed together and 

 separated ohly by a cut-like fissure, not dotted or 

 otherwise marked 4, Himaria- 



Cal^rx subeoually 5-lobed; petals free; stigmas and cells 

 of the ovary 6-7. Each division of the plant either 

 ovoid or obovoid and slightly notched on the top, or 

 obliquely or conically-ovoid or sub-cylindric v/ith a 

 closed mouth-like fissure on one side of it. 



5, Gibbaeuia 



18. 3eeds and ovules arising from a central axis, not flat 



nor wina-ed, frm''^ ^'■rtly or nearly superior, opening 

 when wetted by - "alves, and v/ith 4-5 open cells 

 vnthoi-it cell-winffs or tubercles; petals united into 

 a short tube ■ ■*" ^-^--^ ■'--se 19 



Seeds and ovules arising from a -placenta down the 

 centre of the outer wall or floor of the cells, or 

 in the genera 6, Argyro derma , 11, ^unctilarla and 12, 

 Glottiphyllum, also from the basal part of the central 

 axis, not flat nor winged; petals mostly free, but 

 in a few genera united into a tube at the base 27 



19. leaves all or many of them (at least on the flovrering 



branches) alternate 20 



Leaves a''] opposite 24 



20. Leaves with a distinct closed tubular sheath embracing 



the stem 21 



Leaves without a tubular sheath 22 



21. 3te>^. v^ry short and completely concealed by the stout 



leaf-sheaths that clasp it; leaves 2 to e^ch growth. 



