| 31. | The inflorescence is an umbel of many tiny white flowers.
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| 32. | Small flowers in umbels develop only on the fertile stems or branches.
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| 33. | The inflorescence is an umbel of many tiny yellow flowers.
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| 34. | There are two bracts at the base of the umbel.
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| 35. | The main umbel has hermaphroditic flowers, containing both stamen and pistil.
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| 36. | Flowers are borne in umbels on the tips of branches.
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| 37. | It produces an umbel of white flowers in late spring.
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| 38. | It produces a rather large umbel of pink flowers with narrow tepals.
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| 39. | Flowers are green, borne in umbels of 3-8 flowers.
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| 40. | Flowers are borne in axillary umbels of 3-4 white flowers.
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