| Alternanthera iresinoides Kunth | Pfaffia iresinoides (Kunth) Spreng. | | | Alternanthera iresinoides Kunth | Pfaffia iresinoides (Kunth) Spreng. | 2712 | 27475 |
| Alternanthera sessilis (L.) DC. | | a | | Alternanthera sessilis (L.) DC. | | 2713 | |
| Alternanthera amoena (Lem.) Voss | Alternanthera bettzickiana (Regel) G. Nicholson | | | Alternanthera amoena (Lem.) Voss | Alternanthera bettzickiana (Regel) G. Nicholson | 101483 | 105429 |
| Alternanthera brasiliana (L.) Kuntze | | a | | Alternanthera brasiliana (L.) Kuntze | | 101485 | |
| Alternanthera ficoidea (L.) P. Beauv. | | a | | Alternanthera ficoidea (L.) P. Beauv. | | 101486 | |
| Alternanthera ficoidea (L.) P. Beauv. var. amoena (Lem.) L. B. Sm. & Downs | Alternanthera bettzickiana (Regel) G. Nicholson | | i | Alternanthera ficoidea (L.) P. Beauv. var.amoena (Lem.) L. B. Sm. & Downs | Alternanthera bettzickiana (Regel) G. Nicholson | 101489 | 105429 |
| Alternanthera hassleriana Chodat ex Chodat & Hassl. | | a | | Alternanthera hassleriana Chodat ex Chodat & Hassl. | | 101494 | |
| Alternanthera philoxeroides (Mart.) Griseb. | | a | | Alternanthera philoxeroides (Mart.) Griseb. | | 101502 | |
| Alternanthera bettzickiana (Regel) G. Nicholson | | a | | Alternanthera bettzickiana (Regel) G. Nicholson | | 105429 | |
| Alternanthera tenella Colla | Alternanthera ficoidea (L.) P. Beauv. | | | Alternanthera tenella Colla | Alternanthera ficoidea (L.) P. Beauv. | 310368 | 101486 |
| Alternanthera pungens Kunth | | a | | Alternanthera pungens Kunth | | 316546 | |
| Alternanthera repens (L.) Link | Alternanthera pungens Kunth | | | Alternanthera repens (L.) Link | Alternanthera pungens Kunth | 317493 | 316546 |
| Alternanthera denticulata R. Br. | | a | | Alternanthera denticulata R. Br. | | 401516 | |
| Alternanthera angustifolia R. Br. | | a | | Alternanthera angustifolia R. Br. | | 401519 | |
| Alternanthera nana R. Br. | | a | | Alternanthera nana R. Br. | | 401521 | |
| Alternanthera nodiflora R. Br. | | a | | Alternanthera nodiflora R. Br. | | 401522 | |
| Alternanthera caracasana Kunth | | a | | Alternanthera caracasana Kunth | | 407542 | |
| Alternanthera pubiflora (Benth.) Kuntze | | a | | Alternanthera pubiflora (Benth.) Kuntze | | 411916 | |
| Alternanthera achyrantha R. Br. ex Sweet | Alternanthera pungens Kunth | | | Alternanthera achyrantha R. Br. ex Sweet | Alternanthera pungens Kunth | 414339 | 316546 |
| Alternanthera olivacea (Urb.) Urb. | | a | | Alternanthera olivacea (Urb.) Urb. | | 414343 | |
| Alternanthera spp. | | a | | Alternanthera spp. | | 419815 | |
| Alternanthera halimifolia (Lam.) Standl. | | a | | Alternanthera halimifolia (Lam.) Standl. | | 447067 | |
| Alternanthera glabra Moq. | Alternanthera sessilis (L.) DC. | | | Alternanthera glabra Moq. | Alternanthera sessilis (L.) DC. | 447545 | 2713 |
| Alternanthera dentata (Moench) Stuchlik ex R. E. Fr. | Alternanthera brasiliana (L.) Kuntze | | | Alternanthera dentata (Moench) Stuchlik ex R. E. Fr. | Alternanthera brasiliana (L.) Kuntze | 448566 | 101485 |
| Alternanthera mexicana Moq. | | a | | Alternanthera mexicana Moq. | | 459710 | |
| Alternanthera albotomentosa Suess. | | a | | Alternanthera albotomentosa Suess. | | 459712 | |
| Alternanthera peploides (Humb. & Bonpl. ex Willd.) Urb. | Alternanthera caracasana Kunth | | | Alternanthera peploides (Humb. & Bonpl. ex Willd.) Urb. | Alternanthera caracasana Kunth | 459895 | 407542 |
| Alternanthera paronychioides A. St.-Hil. | Alternanthera ficoidea (L.) P. Beauv. | | | Alternanthera paronychioides A. St.-Hil. | Alternanthera ficoidea (L.) P. Beauv. | 467227 | 101486 |
| Alternanthera tryphysa Dennst. | Ailanthus tryphysa (Dennst.) Alston | | | Alternanthera tryphysa Dennst. | Ailanthus tryphysa (Dennst.) Alston | 468251 | 468250 |
| Alternanthera flavescens Kunth | | a | | Alternanthera flavescens Kunth | | 476984 | |