Dichotomous key

1A.  Leaves needle-like; stems woody…………………………………………………………………………….      Plant 1

1B.  Leaves with flattened blade, simple or lobed; stems herbaceous………………………………………………       2

2A.  Leaves deeply lobed; stamens numerous; petals purple………………………………………………      Plant 3

2B.  Leaves unlobed; stamens 2-6; petals white or absent…………………………………………………..      3

3A.  Flowers either staminate or pistillate on separate inflorescences; petals absent…..      Plant 4

3B.  Flowers perfect; petals 4, white……………………………………….      Plant 2

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