Here you can find a lot of low-poly plants (around 60 unique meshes) with a good quality backed from high-poly sculpts textures. All plants gathered at two 4096x4096 texture sets.
Triangle counts:
Flower1 - 195 triangles
Flower10 - 144 triangles
Flower2 - 108 triangles
Flower3 - 104 triangles
Flower4 - 45 triangles
Flower5 - 40 triangles
Flower6 - 48 triangles
Flower71 - 3421 triangles
Flower72 - 429 triangles
Flower73 - 1848 triangles
Flower7S1 - 55 triangles
Flower7S2 - 66 triangles
Flower7S3 - 143 triangles
Flower81 - 135 triangles
Flower82 - 135 triangles
Flower83 - 945 triangles
Flower91 - 204 triangles
Flower92 - 72 triangles
Flower93 - 72 triangles
PlantB11 - 2102 triangles
PlantB12 - 1422 triangles
PlantB18 - 476 triangles
PlantB18F - 546 triangles
PlantB2 - 1134 triangles
PlantB3 - 1742 triangles
PlantB31 - 333 triangles
PlantB32 - 497 triangles
PlantB4 - 1487 triangles
PlantB5 - 649 triangles
PlantB6 - 1134 triangles
PlantB7 - 1994 triangles
PlantB8 - 539 triangles
PlantG19 - 72 triangles
PlantG1 - 852 triangles
PlantG1F - 892 triangles
PlantG12 - 288 triangles
PlantG12F - 483 triangles
PlantG13 - 690 triangles
PlantG13F - 5805 triangles
PlantG14 - 542 triangles
PlantG14F - 590 triangles
PlantG15 - 216 triangles
PlantG15F - 306 triangles
PlantG161 - 390 triangles
PlantG161F - 525 triangles
PlantG162 - 499 triangles
PlantG162F - 598 triangles
PlantG171 - 252 triangles
PlantG171F - 396 triangles
PlantG172 - 756 triangles
PlantG172F - 1248 triangles
PlantG2 - 376 triangles
PlantG3 - 630 triangles
PlantG51 - 546 triangles
PlantG52 - 266 triangles
PlantG6 - 432 triangles
PlantG7 - 232 triangles
PlantG8 - 173 triangles
PlantGS41 - 340 triangles
PlantGS42 - 240 triangles
PlantGS42_F - 280 triangles
PlantGS9 - 226 triangles