| Malvaceae | |
Malacothamnus abbottii
| (Eastw.) Kearney | Leafl. W. Bot. 6(6): 129 | 1951 |
| Malvaceae | |
Malacothamnus aboriginum
| (B.L. Rob.) Greene | Leafl. Bot. Observ. Crit. 1(15): 208 | 1906 |
| Malvaceae | |
Malacothamnus arcuatus
| (Greene) Greene | Leafl. Bot. Observ. Crit. 1(15): 208 | 1906 |
| Malvaceae | |
Malacothamnus astrotentaculatus
| K. Morse | Malacothamnus 2: 65 | 2023 |
| Malvaceae | |
Malacothamnus chilensis
| (Gay) Krapov. | Bol. Soc. Argent. Bot. 4: 189 | 1952 |
| Malvaceae | |
Malacothamnus clementinus
| (Munz & I.M. Johnst.) Kearney | Leafl. W. Bot. 6(6): 127 | 1951 |
| Malvaceae | |
Malacothamnus davidsonii
| (B.L. Rob.) Greene | Leafl. Bot. Observ. Crit. 1(15): 208 | 1906 |
| Malvaceae | |
Malacothamnus densiflorus
| (S. Watson) Greene | Leafl. Bot. Observ. Crit. 1(15): 208 | 1906 |
| Malvaceae | |
Malacothamnus discombobulatus
| K. Morse | Malacothamnus 2: 70 | 2023 |
| Malvaceae | |
Malacothamnus eastwoodiae
| K. Morse | Malacothamnus 2: 62 | 2023 |
| Malvaceae | |
Malacothamnus enigmaticus
| K. Morse & T. Chester | Madroño 66(3): 113–115, f. 1 (map), 2, 3A, 8 | 2019 |
| Malvaceae | |
Malacothamnus fasciculatus
| (Nutt. ex Torr. & A. Gray) Greene | Leafl. Bot. Observ. Crit. 1(15): 208 | 1906 |
| Malvaceae | |
Malacothamnus foliosus
| (S. Watson) Kearney | Leafl. W. Bot. 6(6): 122 | 1951 |
| Malvaceae | |
Malacothamnus fremontii
| (Torr. ex A. Gray) Greene | Leafl. Bot. Observ. Crit. 1(15): 208 | 1906 |
| Malvaceae | |
Malacothamnus gracilis
| (Eastw.) Kearney | Leafl. W. Bot. 6(6): 130 | 1951 |
| Malvaceae | |
Malacothamnus hallii
| (Eastw.) Kearney | Leafl. W. Bot. 6(6): 134 | 1951 |
| Malvaceae | |
Malacothamnus helleri
| (Eastw.) Kearney | Leafl. W. Bot. 6(6): 124 | 1951 |
| Malvaceae | |
Malacothamnus howellii
| (Eastw.) Kearney | Leafl. W. Bot. 6(6): 126–127 | 1951 |
| Malvaceae | |
Malacothamnus involucratus
| (B.L. Rob.) K. Morse | Crossosoma 44(1–2): 22 | 2018 [2021] |
| Malvaceae | |
Malacothamnus jonesii
| (Munz) Kearney | Leafl. W. Bot. 6(6): 135 | 1951 |
| Malvaceae | |
Malacothamnus lucianus
| (Kearney) K. Morse | Crossosoma 44(1–2): 22 | 2018 [2021] |
| Malvaceae | |
Malacothamnus marrubioides
| (Durand & Hilg.) Greene | Leafl. Bot. Observ. Crit. 1(15): 208 | 1906 |
| Malvaceae | |
Malacothamnus mendocinensis
| (Eastw.) Kearney | Leafl. W. Bot. 6(6): 133 | 1951 |
| Malvaceae | |
Malacothamnus nesioticus
| (B.L. Rob.) Abrams | Bull. New York Bot. Gard. 6(21): 419 | 1910 |
| Malvaceae | |
Malacothamnus niveus
| (Eastw.) Kearney | Leafl. W. Bot. 6(6): 123 | 1951 |
| Malvaceae | |
Malacothamnus nuttallii
| Abrams | Bull. New York Bot. Gard. 6(21): 417–418 | 1910 |
| Malvaceae | |
Malacothamnus orbiculatus
| (Greene) Greene | Leafl. Bot. Observ. Crit. 1(15): 208 | 1906 |
| Malvaceae | |
Malacothamnus palmeri
| (S. Watson) Greene | Leafl. Bot. Observ. Crit. 1(15): 208 | 1906 |
| Malvaceae | |
Malacothamnus paniculatus
| (A. Gray) Kearney | Leafl. W. Bot. 6: 123 | 1951 |
| Malvaceae | |
Malacothamnus parishii
| (Eastw.) Kearney | Leafl. W. Bot. 6(6): 136 | 1951 |