1. Styles cylindrical, not tapered distally, the stigma truncate or broadened, sometimes becoming subpeltate or bilobed in anthesis; carpels and styles 2 or 3; lamina mostly with glands immersed in adaxial surface, at least at apex; plants functionally unisexual, the pistillate flowers with flattened anthers containing aborted pollen, the staminate flowers with a small gynoecium not developing into a fruit.
1. Styles slender and subulate, tapered distally to a minute stigma; carpels and styles 3; lamina without glands in adaxial surface; plants bisexual, all flowers alike, with fertile anthers and a gynoecium capable of developing into a fruit.
2. Bracteoles (1 or more in every cincinnus) bearing 1 large terminal or abaxial gland; stipules 2/3 to completely connate; anthers with the outer locules bearing longitudinal wings.
2. Bracteoles all eglandular; stipules distinct or connate only at base; anthers with the outer locules smooth or bearing a distal line or cluster of vesicular outgrowths.
3. Leaves completely eglandular; sepals all bearing large paired abaxial glands, with adjacent glands sometimes partially connate; anthers with the outer locules bearing a distal line or cluster of vesicular outgrowths; inflorescence containing at least some several-flowered cincinni.
3. Leaves usually bearing glands on petiole and/or proximally on margin of lamina; sepals all eglandular or with a single very small gland at base of sinus between some or all adjacent sepals; anthers with outer locules smooth; inflorescence containing only single flowers [1-flowered cincinni]