| Berberidaceae | Berberis laurina Billb. | 1 | M-OR | ||||
| Blechnaceae | Blechnum brasiliense Desv. | 1 | OR | ||||
| Blechnaceae | Blechnum sp. | 1 | OR | ||||
| Blechnaceae | Blechnum tabulare (Thunb.) Kuhn | 2 | OR | ||||
| Myrtaceae | Blepharocalyx salicifolius (Kunth) O. Berg | 1.2 | M-OR-T | ||||
| Poaceae | Bothriochloa laguroides (DC.) Herter var. laguroides | 3 | FO-OR | ||||
| Bromeliaceae | Bromelia antiacantha Bertol. | 1 | OR | ||||
| Poaceae | Bromus catharticus Vahl | 3 | FO-OR | ||||
| Buddlejaceae | Buddleja thyrsoides Lam. | 1.2 | M-OR | ||||
| Arecaceae | Butia odorata (Barb. Rodr.) Noblick | 1.2 | P | F-M-OR -Fi | |||
| Asteraceae | Calea uniflora Less. | 1 | M | ||||
| Cannaceae | Canna glauca L. | 1.2 | M-OR | ||||
| Sapindaceae | Cardiospermum grandiflorum Sw. | 1 | M | ||||
| Cyperaceae | Carex spp. | 23 | OR | ||||
| Salicaceae | Casearia sylvestris Sw. | 1 | M | ||||
| Cucurbitaceae | Cayaponia bonariensis (Mill.) Mart.Crov. | 1 | M | ||||
| Cannabaceae | Celtis ehrenbergiana (Klotzsch) Liebm. | 1 | M-OR-T | ||||
| Cannabaceae | Celtis iguanaea (Jacq.) Sarg. | 1 | M | ||||
| Apiaceae | Centella asiatica (L.) Urb. | 2, 3, 4 |
| M-OR | |||
| Rubiaceae | Cephalanthus glabratus (Spreng.) K. Schum. | 2 |
| M-OR | |||
| Cactaceae | Cereus uruguayanus R. Kiesling | 1 |
| OR | |||
| Solanaceae | Cestrum parqui L’Hér. | 1 |
| M | |||
| Asteraceae | Chaptalia arechavaletae Hieron. Chascolytrum poomorphum (J. Presl) Essi, Longhi-Wagner & | 1 |
| OR | |||
| Poaceae | Souza-Chies | 3 |
| FO | |||
| Poaceae | Chascolytrum subaristatum (Lam.) Desv. | 3 |
| FO-OR | |||
| Asteraceae | Chevreulia sarmentosa (Pers.) S.F. Blake | 1.3 |
| OR | |||
| Rubiaceae | Chiococca alba (L.) C.L. Hitchc. | 1 |
| M-OR | |||
| Sapotaceae | Chrysophyllum gonocarpum (Mart. & Eichler) Engl. | 1 |
| F | |||
| Vitaceae | Cissus palmata Poir. | 1 |
| OR | |||
| Vitaceae | Cissus striata Ruiz & Pav. | 1.2 |
| OR | |||
| Verbenaceae | Citharexylum montevidense (Spreng.) Moldenke | 1 |
| OR-T | |||
| Cardiopteridaceae | Citronella gongonha (Mart.) R.A. Howard | 1 |
| M | |||
| Ranunculaceae | Clematis montevidensis | 1.3 |
| M-OR | |||
| Linaceae | Cliococca selaginoides (Lam.) C.M. Rogers & Mildner | 1 |
| OR | |||
| Rhamnaceae | Colletia paradoxa (Spreng.) Escal. | 1 |
| M-OR | |||
| Commelinaceae | Commelina diffusa Burm. f. var. diffusa | 4 |
| M | |||
| Rhamnaceae | Condalia buxifolia Reissek | 1 |
| M | |||