81a. Purple flowers in spike-like
racemes;
pedicels
less than 10 mm
long.............................................................................................
#70. Loosestrife.
Lythrum californicum.
81b. Blue flowers axillary;
pedicels greater than 10 mm long.......
#71.
Scarlet Pimpernel.
(blue phase)
Anagallis arvensis.