=Hippocrateaceæ= kk) Flowers unisexual; ovules pendulous from the apex of the cell; seeds often carunculate. =Euphorbiaceæ= ii) Leaves exstipulate or stipules gland-like: j) Anthers opening at the apex by a pore, often appendaged at the base; stamens as many or twice as many as the petals; leaves often with 3-9 longitudinally parallel nerves. =Melastomataceæ= jj) Anthers opening by slits lengthwise; leaves usually with pinnate nerves: k) Ovules numerous in each cell; anthers inflexed in bud; calyx more or less tubular, with valvate lobes, often with accessory lobes. =Lythraceæ= kk) Ovules few in each cell: =Malpighiaceæ= l) Ovules pendulous from the apex of the cells; calyx fairly long and tubular, more or less petaloid; petals usually very small. =Thymelæaceæ= ll) Ovules erect or ascending from the base of the cells; calyx imbricate: m) Filaments subulate or filiform; stamens usually 5. =Celastraceæ= mm) Filaments flattened; stamens usually 3. =Hippocrateaceæ= hh) Herbs, sometimes slightly woody at the base: i) Leaves stipulate; stipules paired; styles free from the base; ovules numerous, axile. =Elatinaceæ= ii) Leaves exstipulate: j) Leaves with 3 or more longitudinally parallel nerves; anthers usually appendaged and opening by a terminal pore. =Melastomataceæ= jj) Leaves not as above; anthers opening by longitudinal slits; stamens perigynous; anthers inflexed in bud. =Lythraceæ= ee) Leaves alternate or all radical: f) Stamens more than twice the number of the sepals or petals: g) Sepals valvate or open in bud: h) Anthers 2-celled: i) Stamens free or slightly united only at the base: j) Calyx closed in bud: k) Flowers hermaphrodite; leaves simple; wood not resinous. =Tiliaceæ= kk) Flowers unisexual; leaves entire or 3-lobed; petiole with 2 glands at the apex. =Euphorbiaceæ=