* Stamens ten.
** Stamens Jive.
(97) Drosera - calyx deeply five-cleft; petals five; styles 3-5, deeply bifid; capsule one-celled, 3-5-valved, many-seeded.
(99) Peplis - calyx campanulate, with twelve teeth; petals six, minute, fugacious; style very short.
* Stamens eight; (flowers regular or nearly so).
(101) oenothera - calyx tubular below, four-lobed; seeds not bearded; flowers large, yellow.
** Stamens two; (flowers very irregular).
(102) Circsea - calyx deeply two-cleft; petals two.
* Stamens eight (sometimes four or six).
** Stamens one only.
(101) Hippuris - stigma one, sessile on the ovary; fruit a one-celled nut.
(105) Cornus - petals distinct; fruit a succulent drupe.
* Umbels simple or imperfectly compound.
† Fruit without vittae (oil-cysts); albumen solid (not furrowed) .
Fruit laterally compressed.
(106) Hydrocotyle - fruit flat nearly orbicular, of two carpels, each with five filiform ridges; commissure linear; calyx teeth obsolete.
‡‡ Transverse section of fruit nearly round.
(107) Sanieula - fruit subglobose, covered with hooked spines; without ridges; calyx of five leafy teeth.
(108) Eryngium - fruit obovate, covered with chaffy scales without ridges; calyx of five leafy teeth.
†† Fruit with vittae; albumen furrowed or involute on the inner face.
(131) Torilis - see page 158.
** Umbels compound or perfect. † Fruit not prickly. Albumen solid (not indented with a longitudinal furrow). § Fruit laterally compressed. Leaves compoundly divided. (a) Calyx teeth foliaceous.
(109) Cicuta - fruit roundish-cordate; carpels with five equal broad flattened ridges, the lateral marginal; interstices with single vittae.
(b) Calyx teeth small or obsolete; petals entire.
(L10) Apium - fruit roundish-ovate; carpels with five filiform equal ridges; vittae single in the interstices; involucre none.
(111) Helosciadium - fruit ovate or oblong; carpels with five filiform prominent equal ridges; vittae single in the interstices; involucre many-leaved.
(c) Calyx teeth small or obsolete; petals obcordate or emarginate.