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PLATE XV. LETTER XIX. 
HEP TJNDRIA. 
Fig. 1. iEscul us Hippocastanum. Ilorse 
Cfiesnut. 
a The corolla of five petals, and the seven 
stamens, with bending filaments. 
b The one-leafed calyx, swelling at the base, 
and divided at top into five segments, 
c The young capsule terminated by the style. 
fl A single stamen. 
OCTANDRIA. 
Fig. 2. Oenothera biennis. Tree Primrose . 
a A flower, showing the four-parted calyx, 
and the corolla of four obcordate petals. 
h The eight stamens, and the pistil in the 
the middle, with deflected calyx. 
c The pistil, with the filiform style, and the 
quadrifid stigma. 
d The capsule. 
e A transverse section of the capsule, show¬ 
ing the four cells. 
f The seeds. 
