294, POPULAR FIELD BOTANY. 
Resepa LuTEA, Base Rocket, or Wild Mignionette, where 
the leaves are very variable, but usually divided into three. 
Flowers a deeper yellow, and generally growing in the same 
places as the last species. 
DopECANDRIA. DODECAGYNIA: 
CALYCIFLOR&. CRASSULACES. 
SEMPERVIVUM. (Hovs&-Lzex.) 
Generic Character. Calyx divided into twelve parts. Petals 
twelve. 
SEMPERVIVUM TECTORUM. Common House-leek. A well- 
known plant, growing on cottage roofs and walls. Leaves 
thick and fleshy, collected together near the root. Flowers 
very handsome, and curious in structure; they have, in 
reality, twenty-four stamens, one at the bottom of each 
petal, producing pollen as usual ; the other twelve alternate 
with the petals, not possessing pollen like the rest, but 
little unripe seeds at the top. 
