| Urticaceae | ! |
Urtica acuminata
| Poir. | Encycl. Suppl. 1 4: 226 | 1816 |
| Urticaceae | * |
Urtica acuminata
| Roxb. | Fl. Ind. 3: 589 | 1832 |
| Urticaceae | |
Urtica adoensis
| Hochst. ex Steud. | Flora 33(17): 259 | 1850 |
| Urticaceae | |
Urtica aestuans
| L. | Sp. Pl. (ed. 2) 2: 1397 | 1763 |
| Urticaceae | |
Urtica affinis
| Hook. & Arn. | Bot. Beechey Voy. 69 | 1841 [1832] |
| Urticaceae | |
Urtica alba
| Raf. | Fl. Ludov. 114 | 1817 |
| Urticaceae | |
Urtica alceifolia
| Poir. | Encycl. Suppl. 1 4: 227 | 1816 |
| Urticaceae | * |
Urtica alienata
| L. | Syst. Veg. (ed. 13) 709 | 1758 |
| Urticaceae | |
Urtica andicola
| Wedd. | Ann. Sci. Nat., Bot., sér. 3, 18: 198 | 1852 |
| Urticaceae | |
Urtica angulata
| Blume | Bijdr. Fl. Ned. Ind. (10): 494 | 1825 |
| Urticaceae | |
Urtica angustata
| Blume | Bijdr. Fl. Ned. Ind. (10): 500 | 1825 |
| Urticaceae | * |
Urtica angustifolia
| Ledeb. | Fl. Altaic. 4: 240 | 1833 |
| Urticaceae | ! |
Urtica angustifolia
| Fisch. ex Hornem. | Suppl. Hort. Bot. Hafn. 107 | 1819 |
| Urticaceae | ** |
Urtica anisophylla
| Wall. | Numer. List n. 4594 | 1832 |
| Urticaceae | ** |
Urtica appendiculata
| Wall. | Numer. List n. 4604 | 1831 |
| Urticaceae | |
Urtica aquatica
| Liebm. | Kongel. Danske Vidensk. Selsk. Skr., Naturvidensk. Math. Afd., ser. 5, 2: 291 | 1851 |
| Urticaceae | |
Urtica arborea
| L. f. | Suppl. Pl. 417 | 1781 [1782] |
| Urticaceae | * |
Urtica arborescens
| Link | Enum. Pl. Hort. Berol. Alt. 2: 386 | 1822 |
| Urticaceae | |
Urtica arborescens
| Dum. Cours. | Bot. Cult. 3: 689–690 | 1802 |
| Urticaceae | * |
Urtica ardens
| Blume | Bijdr. Fl. Ned. Ind. (10): 504 | 1825 |
| Urticaceae | ! |
Urtica ardens
| Link | Enum. Pl. Hort. Berol. Alt. 2: 385 | 1822 |
| Urticaceae | |
Urtica argentea
| G. Forst. | Fl. Ins. Austr. 65 | 1786 |
| Urticaceae | |
Urtica arguta
| Kunth | Nov. Gen. Sp. (quarto ed.) 2: 39 | 1817 |
| Urticaceae | |
Urtica armigera
| C. Presl | Abh. Königl. Böhm. Ges. Wiss., ser. 5, 3: 540 | 1845 |
| Urticaceae | ** |
Urtica arvensis
| Poepp. ex Fenzl | Akad. Wiss. Wien, Math.-Naturwiss. Kl., Denkschr. 1: 256 | 1850 |
| Urticaceae | |
Urtica aspera
| | | |
| Urticaceae | |
Urtica atrichocaulis
| (Hand.-Mazz.) C.J. Chen | Bull. Bot. Res., Harbin 3(2): 109 | 1983 |
| Urticaceae | |
Urtica atrovirens
| Req. | | |
| Urticaceae | |
Urtica atrovirens
| Req. ex Loisel. | Mém. Soc. Linn. Paris 6: 432 | 1827 |
| Urticaceae | |
Urtica aureliana
| Riddell | New Orleans Med. Surg. J. 9: 614 | 1853 |
| Urticaceae | |
Urtica australis
| | | |
| Urticaceae | |
Urtica baccifera
| L. | Sp. Pl. (ed. 2) 2: 1398 | 1763 |
| Urticaceae | |
Urtica balearica
| L. | Amoen. Acad. 3: 46 | 1756 |
| Urticaceae | |
Urtica ballotifolia
| Wedd. | Ann. Sci. Nat., Bot., sér. 3, 18: 197 | 1852 |
| Urticaceae | |
Urtica berlandieri
| Blume | Mus. Bot. 2(9): 151–152 | 1856 |
| Urticaceae | |
Urtica berteroana
| Phil. | Linnaea 33: 234 | 1864 |
| Urticaceae | |
Urtica betulifolia
| Sw. | Kongl. Vetensk. Acad. Nya Handl. 8: 59 | 1787 |
| Urticaceae | |
Urtica bianorii
| Paiva | | |
| Urticaceae | |
Urtica bicolor
| Roxb. | Fl. Ind. 3: 589 | 1832 |
| Urticaceae | |
Urtica bonariensis
| Pers. | Syn. Pl. 2(2): 552 | 1807 |
| Urticaceae | |
Urtica bracteata
| Steud. | Flora 33(17): 258 | 1850 |
| Urticaceae | |
Urtica breweri
| S. Watson | Proc. Amer. Acad. Arts 10: 348–349 | 1875 |
| Urticaceae | |
Urtica buchtienii
| H. Ross | Oesterr. Bot. Z. 55: 466 | 1905 |
| Urticaceae | |
Urtica bulbifera
| Siebold & Zucc. | Abh. Bayer. Akad. Wiss., Math.-Naturwiss. Abt. 4(3): 214 | 1846 |
| Urticaceae | |
Urtica bullosa
| Steud. | Flora 33: 259 | 1850 |
| Urticaceae | |
Urtica buraei
| H. Lév. | Bull. Soc. Bot. France 51(Sess. Extraord.): cxliv | 1904 |
| Urticaceae | |
Urtica californica
| Greene | Pittonia 1(19): 281–282 | 1889 |
| Urticaceae | |
Urtica callitrichoides
| Kunth | Nov. Gen. Sp. (quarto ed.) 2: 40 | 1817 |
| Urticaceae | |
Urtica canadensis
| L. | Sp. Pl. 2: 985 | 1753 |
| Urticaceae | |
Urtica candicans
| Burm. f. | Fl. Indica 197 | 1768 |
| Urticaceae | |
Urtica cannabina
| L. | Sp. Pl. 2: 984 | 1753 |
| Urticaceae | |
Urtica capensis
| L. f. | Suppl. Pl. 417 | 1781 [1782] |
| Urticaceae | |
Urtica capitata
| L. | Sp. Pl. 2: 985 | 1753 |
| Urticaceae | |
Urtica caracasana
| Jacq. | Pl. Hort. Schoenbr. 3: 71, t. 386 | 1798 |
| Urticaceae | |
Urtica caravellana
| Schrank | Pl. Rar. Hort. Monac. , t. 82 | 1819 |
| Urticaceae | |
Urtica cardiophylla
| Rydb. | Bull. Torrey Bot. Club 24(4): 191 | 1897 |
| Urticaceae | * |
Urtica caudata
| Vahl | Symb. Bot. 2: 96 | 1791 |
| Urticaceae | * |
Urtica caudata
| Poir. | Encycl. 4: 640 | 1798 |
| Urticaceae | ! |
Urtica caudata
| Burm. f. | Fl. Indica 198 | 1768 |
| Urticaceae | |
Urtica cellulosa
| Spreng. | Neue Entdeck. Pflanzenk. 3: 21 | 1822 |
| Urticaceae | |
Urtica chamaedryoides
| Pursh | Fl. Amer. Sept. 1: 113 | 1814 [1813] |
| Urticaceae | |
Urtica chichiaztli
| Sessé & Moc. | Pl. Nov. Hisp. 160 | 1890 |
| Urticaceae | |
Urtica chilensis
| Molina | Sag. Stor. Nat. Chili (ed. 2) 297 | 1810 |
| Urticaceae | ** |
Urtica churta
| Wall. | Numer. List no. 4608 | 1832 |
| Urticaceae | |
Urtica ciliaris
| L. | Syst. Nat. (ed. 10) 2: 1266 | 1759 |
| Urticaceae | |
Urtica circularis
| (Hicken) Sorarú | Darwiniana 17: 277 | 1972 |
| Urticaceae | |
Urtica collina
| Bertero ex Spreng. | Syst. Veg. [Sprengel] 3: 839 | 1826 |
| Urticaceae | |
Urtica commersonia
| Wedd. | Ann. Sci. Nat., Bot., sér. 3, 18: 202 | 1852 |
| Urticaceae | |
Urtica condensata
| Hochst. ex Steud. | Flora 33: 260 | 1850 |
| Urticaceae | |
Urtica contracta
| Blume | Bijdr. Fl. Ned. Ind. (10): 505 | 1825 |
| Urticaceae | |
Urtica copeyana
| Killip | Publ. Field Mus. Nat. Hist., Bot. Ser. 18(1): 398 | 1937 |
| Urticaceae | |
Urtica corallina
| Liebm. | Kongel. Danske Vidensk. Selsk. Skr., Naturvidensk. Math. Afd., ser. 5, 2: 295 | 1851 |
| Urticaceae | |
Urtica cordata
| (Gaudich.) Steud. | Nomencl. Bot. (ed. 2) 2: 734 | 1841 |
| Urticaceae | |
Urtica crenato
| H. Ross | | |
| Urticaceae | ! |
Urtica crenulata
| Sw. | Kongl. Vetensk. Acad. Nya Handl. 6: 35–36 | 1785 |
| Urticaceae | * |
Urtica crenulata
| Roxb. | Fl. Ind. 3: 591 | 1832 |
| Urticaceae | |
Urtica cubensis
| Klotzsch ex Herder | Index Seminum (St. Petersburg) 38: | 1858 |
| Urticaceae | |
Urtica cuneata
| A. Rich. | Hist. Fís. Cuba, Bot. 11: 224 | 1850 |
| Urticaceae | |
Urtica cuneifolia
| Sw. | Kongl. Vetensk. Acad. Nya Handl. 8: 70 | 1787 |
| Urticaceae | |
Urtica cuneiformis
| Savigny | Encycl. 4: 640–641 | 1798 |
| Urticaceae | |
Urtica cuspidata
| Willd. | Sp. Pl. 4(1): 349 | 1805 |
| Urticaceae | |
Urtica cyanescens
| Kom. | Fl. SSSR 5: 714–715 | 1936 |
| Urticaceae | |
Urtica cylindrica
| L. | Sp. Pl. 2: 984 | 1753 |
| Urticaceae | |
Urtica cymosa
| Pavon ex Weddell pro syn. | Ann. Sci. Nat., Bot., sér. 3, 18: 219 | 1852 |
| Urticaceae | |
Urtica cypria
| (H. Lindb.) Hand | Cypricola 12: 15 | 2019 |
| Urticaceae | ** |
Urtica dauciodora
| Ruiz & Pav. ex Wedd. | Ann. Sci. Nat., Bot., sér. 3, 18: 223 | 1852 |
| Urticaceae | |
Urtica decumana
| Roxb. | Fl. Ind. 3: 587 | 1832 |
| Urticaceae | |
Urtica dentata
| Hand.-Mazz. | Symb. Sin. 7(1): 112, pl. 2, f. 7–8 | 1929 |
| Urticaceae | |
Urtica depressa
| Sw. | Kongl. Vetensk. Acad. Nya Handl. 8: 64 | 1787 |
| Urticaceae | |
Urtica dichotoma
| Blume | Bijdr. Fl. Ned. Ind. (10): 499 | 1825 |
| Urticaceae | ** |
Urtica dichroa
| Poepp. ex Wedd. | Prodr. 16(1): 61 | 1869 |
| Urticaceae | |
Urtica diffusa
| Sw. | Kongl. Vetensk. Acad. Nya Handl. 8: 30 | 1785 |
| Urticaceae | |
Urtica dioica
| L. | Sp. Pl. 2: 984 | 1753 |
| Urticaceae | |
Urtica diplotricha
| Phil. | Linnaea 33: 234 | 1864 |
| Urticaceae | |
Urtica divaricata
| L. | Sp. Pl. 2: 985 | 1753 |
| Urticaceae | |
Urtica divergens
| G. Mey. | Prim. Fl. Esseq. 264 | 1818 |
| Urticaceae | |
Urtica diversifolia
| Link | Enum. Pl. Hort. Berol. Alt. 2: 385 | 1822 |
| Urticaceae | |
Urtica dodartii
| L. | Syst. Nat. (ed. 10) 2: 1265 | 1759 |
| Urticaceae | |
Urtica domingensis
| Urb. | Ark. Bot. 23A(5): –1 | 1930 |
| Urticaceae | * |
Urtica dubia
| Forssk. | Fl. Aegypt.-Arab. 121 | 1775 |