As per efi thread : 

Lippia: Spreading shrubs, hairs simple. spikes elongate, style sublateral, fruit wall thin, corolla tube much protruding
Lanatana: Spreading Shrubs, hairs simple, Spikes dense,  style sublateral, fruit wall fleshy, corolla tube not protruding much
Phyla: Prostrate herbs, hairs medifixed, spikes dense, style terminal, fruit wall thin, corolla tube not protruding much. 
Lantana may easily be distinguished by its stem and leaves being harshly pubescent


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