kkkk) Leaves very small and more or less ericoid; flowers in slender spikes or racemes: =Tamaricaceæ= ii) Leaves compound: j) Flowers in heads or dense spikes; petals valvate; ovary of 1 carpel; ovules more than 1. =Mimosaceæ= jj) Flowers not in heads or dense spikes; ovary usually of more than one carpel; ovule solitary. =Anacardiaceæ= jjj) Flowers racemose; ovary of 5 carpels with numerous ovules. =Caricaceæ= =GROUP 5. One carpel or more than one united carpels; ovules on the walls of the ovary; ovary superior; petals present, more or less united.= a) Stamens free from the corolla-tube: b) Ovary composed of more than one carpel: c) Stamens numerous, more than twice the number of the corolla lobes; anthers opening by longitudinal slits with broadened truncate connective; seeds with copious ruminate endosperm; shrubs, trees or climbers with exstipulate simple leaves. =Anonaceæ= cc) Stamens 5-12; anthers not appendaged at the apex, usually opening by longitudinal slits, rarely by pores; leaves alternate, exstipulate; erect trees or shrubs: d) Leaves fairly large; flowers more or less corymbose; stamens 5. =Pittosporaceæ= dd) Leaves very small and scale-like; flowers in slender spikes or racemes; stamens 5-10. =Tamaricaceæ= bb) Ovary composed of a single carpel (usually a legume); stamens free or more usually diadelphous or monadelphous, often 10, rarely numerous: c) Stamens connate into a sheath or free; flowers usually hermaphrodite: d) Flowers actinomorphic (regular); petals valvate; calyx gamosepalous or valvate; leaves usually bipinnate, rarely simply pinnate; flowers often collected into heads. =Mimosaceæ= dd) Flowers zygomorphic (irregular) or rarely actinomorphic; sepals imbricate or rarely valvate; petals imbricate, the upper (adaxial) one inside the others; leaves often pinnate or bipinnate. =Cæsalpiniaceæ= ddd) Flowers zygomorphic; petals imbricate, the upper (adaxial) one (the standard) outside the others, the lateral two (the wings) outside the abaxial pair (the keel) which are more or less united along their lower edges; leaves simple, digitate or simply pinnate. =Papilionaceæ=