1 | Anthers basifixed; carpels 15-20 |
1' | Anthers versatile; carpels more than 20 |
2 | Emersed leaves with pellucid markings absent; flowers 0.6-0.8 cm wide |
2' | Emersed leaves with pellucid markings present as lines; flowers 0.8-1.7 cm wide |
3 | Fruits eglandular |
3' | Fruits glandular |
4 | Pellucid markings of leaf blades present as reticulate network |
4' | Pellucid markings of leaf blades absent |
5 | Leaves with basal lobes |
5' | Leaves without basal lobes |
6 | Inflorescence racemose, decumbant, with 3-4 whorls, vegetatively proliferating; bracts longer than subtending pedicel |
6' | Inflorescence paniculate or rarely racemose, erect, with 7-14 whorls, not vegetatively proliferating; bracts shorter than subtending pedicel |
7 | Submersed leaves usually present; glands of fruits 5 or more, circular |
7' | Submersed leaves absent; glands of fruits 1-2, rarely to 5, elliptic to linear-elliptic; |
8 | Leaves with pellucid markings as separate lines; rachis usually winged between whorls; fruit beak less than half as long as fruit |
8' | Leaves without pellucid markings, rarely present as separate lines; rachis triangular between whorls; fruit beak half or more as long as fruit |