PORTULACACEAE: Purslane Family
KEY TO Phemeranthus (Tallinum) SPECIES
1. Petals (3)4-5(7) mm, stamens (4)5-6(8), flowers opening 5-6 PM EDT or later; fruits 3 mm or less across ...............P. parviflorus
1. Petals (4)5-16 mm, stamens (12)15-80(100), flowers opening 4:30 PM EDT or earlier; fruits more than 3 mm across............. 2
2. Sepals 4.5-5.5 mm; fruits more than 6 mm; plants of Ark, Ill, and westward.......................................................... P. calycinus
2. Sepals 2.7-4 mm; most fruits less than 6 mm; plants of Tennessee, Alabama, and eastward..................................... 3
3. Petals (5)6-8 mm, stamens 12-25 .......................................................................................... P. teretifolius
3. Petals (7)8-11(13) mm, stamens 25-80(100) ......................................................... 4
4. Sepals usually not persistent at base of fruit; stamens (40)50-8080(100). Fruit 3-4 mm; seeds black, 0.9-1 mm across.............. P. mengesii
4. Sepals persistent at base of fruit; stamens 25-45. Fruits 4-6 mm; seeds gray, 1-1.3 mm across..................................... P. calcaricus