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PLATE XVII. LETTER XX. 
DODECANDRIA D 0 DEC A G YNI A . 
Sempervivum tectorum. CommonHoustleek. 
a The flower-stem, with a reflexed range 
of flowers. 
b A flower in front, showing the corolla of 
twelve petals. 
c The calyx, with the capsules, after the 
flower is past. 
d A single capsule. 
e The twelve stamens and twelve styles, 
separated from the flower. 
f A single pistil, exhibiting the germ, style, 
and anther. 
g Two stamens. 
n 
