58a. Corolla <
1.5 cm wide; petal lobes < 7 mm wide, usually pointed at
apex.................................................................................................
#52.
Pasture Phlox.
Phlox cuspidata.
58b. Corolla greater than 1.5 cm wide; petal lobes greater than
7 mm wide,
usually rounded at
apex...............................................................
#53.
Drummond Phlox.
Phlox drummondii.