| Poaceae | |
Holcus aciculatus
| (Retz.) R. Br. | Narr. Travels Africa Appendix: 244 | 1826 |
| Poaceae | |
Holcus alpinus
| Sw. ex Willd. | Sp. Pl. 4(2): 937 | 1806 |
| Poaceae | |
Holcus annuus
| Salzm. ex C.A. Mey. | Verz. Pfl. Casp. Meer. 17 | 1831 |
| Poaceae | |
Holcus arduini
| J.F. Gmel. | Syst. Nat., ed. 13[bis] 2: 174 | 1791 |
| Poaceae | |
Holcus arenarius
| All. | Auct. Fl. Pedem. 46 | 1789 |
| Poaceae | |
Holcus argenteus
| C. Agardh ex Roem. & Schult. | Syst. Veg. (ed. 15 bis) 2: 656 | 1817 |
| Poaceae | |
Holcus asper
| Thunb. | Prodr. Pl. Cap. 20 | 1794 |
| Poaceae | |
Holcus atropurpureus
| (Wahlenb.) Wahlenb. | Svensk Bot. Tidskr. pl. 687 | 1826 |
| Poaceae | |
Holcus australis
| Schrad. | Fl. Germ. 1: 253 | 1806 |
| Poaceae | * |
Holcus avenaceus
| Scop. | Fl. Carniol. (ed. 2) 2: 276 | 1772 |
| Poaceae | |
Holcus bicolor
| L. | Mant. Pl. 2: 301 | 1771 |
| Poaceae | * |
Holcus borealis
| Schrad. | Fl. Germ. 1: 252 | 1806 |
| Poaceae | |
Holcus bulbosus
| (Willd.) Schrad. | Fl. Germ. 1: 248 | 1806 |
| Poaceae | |
Holcus caerulescens
| Gaudich. | Voy. Bonite, Bot. 411, t. 27 | 1830 |
| Poaceae | |
Holcus caespitosus
| Boiss. | Biblioth. Universelle Genève, n.s. 13: 410 | 1838 |
| Poaceae | |
Holcus cafer
| Ard. | Saggi Sci. Lett. Accad. Padova 1: 119 | 1786 |
| Poaceae | |
Holcus caffrorum
| Thunb. | Prodr. Pl. Cap. 1: 20 | 1794 |
| Poaceae | |
Holcus capillaris
| Thunb. | Prodr. Pl. Cap. 20 | 1794 |
| Poaceae | ! |
Holcus cernuus
| Ard. | Saggi Sci. Lett. Accad. Padova 1: 128, pl. 3, f. 1, 2 | 1786 |
| Poaceae | * |
Holcus cernuus
| Willd. | Sp. Pl. 4: 930 | 1806 |
| Poaceae | * |
Holcus cernuus
| Muhl. | Descr. Gram. 276 | 1817 |
| Poaceae | ** |
Holcus ciliatus
| Roxb. | Hort. Bengal. 82 | 1814 |
| Poaceae | ! |
Holcus ciliatus
| Roxb. | Fl. Ind. 1: 321 | 1820 |
| Poaceae | |
Holcus compactus
| Lam. | Encycl. 3: 140 | 1789 |
| Poaceae | |
Holcus contortus
| (L.) Kuntze ex Stuck. | Anales Mus. Nac. Buenos Aires 11: 48 | 1904 |
| Poaceae | |
Holcus cubanicus
| Gled. ex Schult. | | |
| Poaceae | |
Holcus decolorans
| Willd. | Sp. Pl. 4: 931 | 1806 |
| Poaceae | |
Holcus distachyos
| (L.) Roem. & Schult. | Syst. Veg. (ed. 15 bis) 2: 657 | 1817 |
| Poaceae | |
Holcus dochna
| Forssk. | Fl. Aegypt.-Arab. 174 | 1775 |
| Poaceae | |
Holcus durieui
| Steud. | Syn. Pl. Glumac. 1: 15 | 1855 [1853] |
| Poaceae | |
Holcus durra
| Forssk. | Fl. Aegypt.-Arab. 174 | 1775 |
| Poaceae | |
Holcus elongatus
| R. Br. | Prodr. 200 | 1810 |
| Poaceae | |
Holcus exiguus
| Forssk. | Fl. Aegypt.-Arab. 174 | 1775 |
| Poaceae | |
Holcus fauriei
| Honda | | |
| Poaceae | |
Holcus fragrans
| Willd. | Sp. Pl. 4(2): 936 | 1806 |
| Poaceae | |
Holcus fulvus
| R. Br. | Prodr. 1: 199 | 1810 |
| Poaceae | |
Holcus gayanus
| Boiss. | Voy. Bot. Espagne 2: 637, t. 173B | 1842 |
| Poaceae | |
Holcus grandiflorus
| Boiss. & Reut. | Pugill. Pl. Afr. Bor. Hispan. 119 | 1852 |
| Poaceae | |
Holcus grumosus
| (Sennen & Mauricio) Sennen | Cat. Fl. Rif. Orient. 128 | 1933 |
| Poaceae | |
Holcus gryllus
| (L.) R. Br. | Prodr. 199 | 1810 |
| Poaceae | |
Holcus halepensis
| L. | Sp. Pl. 2: 1047–1048 | 1753 |
| Poaceae | |
Holcus hierrensis
| (Stierst.) Stierst. & M.Seq. | Novon 22(3): 312 | 2013 |
| Poaceae | |
Holcus lanatus
| L. | Sp. Pl. 2: 1048 | 1753 |
| Poaceae | |
Holcus latifolius
| Osbeck | Dagb. Ostind. Resa 247 | 1757 |
| Poaceae | |
Holcus laxus
| L. | Sp. Pl. 2: 1048 | 1753 |
| Poaceae | ** |
Holcus laxus
| Bosch ex Trin. | Mém. Acad. Imp. Sci. Saint-Pétersbourg, Sér. 6, Sci. Math., Seconde Pt. Sci. Nat. 6,4(1-2): 57 | 1840 |
| Poaceae | |
Holcus mollis
| L. | Syst. Nat. (ed. 10) 2: 1305 | 1759 |
| Poaceae | |
Holcus monticola
| Bigelow | New England J. Med. Surg. 5: 334 | 1816 |
| Poaceae | |
Holcus muticus
| Kunze | Flora 29: 757 | 1846 |
| Poaceae | ** |
Holcus natans
| Roxb. ex Hook. f. | Fl. Brit. India 7(21): 62 | 1897 [1896] |
| Poaceae | ** |
Holcus nervosus
| Roxb. | Hort. Bengal. 82 | 1814 |
| Poaceae | ! |
Holcus nervosus
| Roxb. | Fl. Ind. 1: 320 | 1820 |
| Poaceae | |
Holcus niger
| Ard. | Saggi Sci. Lett. Accad. Padova 1: 134 | 1786 |
| Poaceae | |
Holcus nitidus
| Vahl | Symb. Bot. 2: 102 | 1791 |
| Poaceae | |
Holcus notarisii
| Nyman | Syll. Fl. Eur. 441 | 1854 |
| Poaceae | |
Holcus nutans
| (L.) Kuntze ex Stuck. | Anales Mus. Nac. Buenos Aires 11: 48 | 1904 |
| Poaceae | |
Holcus odoratus
| L. | Sp. Pl. 2: 1048 | 1753 |
| Poaceae | |
Holcus oriolis
| Sennen & Gonzalo | Plantes d'Espagne Exsicc. No. 5555 | 1925 |
| Poaceae | |
Holcus pallidus
| R. Br. | Prodr. 199 | 1810 |
| Poaceae | |
Holcus parviflorus
| R. Br. | Prodr. 199 | 1810 |
| Poaceae | |
Holcus pertusus
| L. | Mant. Pl. 2: 301–302 | 1771 |
| Poaceae | |
Holcus pintodasilvae
| M.Seq. & Castrov. | Novon 22(3): 312–319, f. 1–4 | 2013 |
| Poaceae | |
Holcus plumosus
| R. Br. | Prodr. 200 | 1810 |
| Poaceae | |
Holcus racemosus
| Forssk. | Fl. Aegypt.-Arab. 175 | 1775 |
| Poaceae | ** |
Holcus redolens
| Sol. ex G. Forst. | Fl. Ins. Austr. 92 | 1786 |
| Poaceae | ! |
Holcus redolens
| Vahl | Symb. Bot. 2: 102 | 1791 |
| Poaceae | |
Holcus repens
| Host | Icon. Descr. Gram. Austriac. 3: 3 | 1805 |
| Poaceae | |
Holcus reuteri
| Boiss. | Pugill. Pl. Afr. Bor. Hispan. 119 | 1852 |
| Poaceae | |
Holcus rigidus
| Hochst. | Fl. Azor. 17 | 1844 |
| Poaceae | |
Holcus rubens
| Gaertn. | Fruct. Sem. Pl. 2: 3 | 1791 |
| Poaceae | *** |
Holcus saccharatus
| L. | Sp. Pl. 2: 1047 | 1753 |
| Poaceae | |
Holcus saccharoides
| (Sw.) Kuntze ex Stuck. | Anales Mus. Nac. Buenos Aires 11: 48 | 1904 |
| Poaceae | |
Holcus serratus
| Thunb. | Prodr. Pl. Cap. 20 | 1794 |
| Poaceae | |
Holcus setifolius
| Thunb. | Fl. Cap. 1: 413 | 1813 |
| Poaceae | ! |
Holcus setiger
| Nees | Linnaea 7: 278–279 | 1832 |
| Poaceae | * |
Holcus setiger
| De Not. | Fl. Ital. 1: 65 | 1848 |
| Poaceae | |
Holcus setiglumis
| Boiss. & Reut. | Diagn. Pl. Nov. Hisp. 27 | 1842 |
| Poaceae | * |
Holcus setosus
| Trin. | Mém. Acad. Imp. Sci. Saint-Pétersbourg, Sér. 6, Sci. Math., Seconde Pt. Sci. Nat. 5,3(3): 87–88 | 1839 |
| Poaceae | ! |
Holcus sorghum
| L. | Sp. Pl. 2: 1047 | 1753 |
| Poaceae | * |
Holcus sorghum
| Brot. | Fl. Lusit. 1: 88 | 1804 |
| Poaceae | |
Holcus spicatus
| L. | Syst. Nat. (ed. 10) 2: 1305 | 1759 |
| Poaceae | |
Holcus striatus
| L. | Sp. Pl. 2: 1048 | 1753 |
| Poaceae | |
Holcus sudanensis
| (Piper) L.H. Bailey | Gentes Herbarum 1: 132 | 1923 |
| Poaceae | ** |
Holcus tener
| Schreb. ex Muhl. | Trans. Amer. Philos. Soc. 3: 182 | 1793 |
| Poaceae | |
Holcus trichocladus
| (Rupr. ex Hack.) Nash | N. Amer. Fl. 17(2): 131 | 1912 |
| Poaceae | ** |
Holcus tuberosus
| Salzm. ex Trin. | Mém. Acad. Imp. Sci. Saint-Pétersbourg, Sér. 6, Sci. Math., Seconde Pt. Sci. Nat. 5,3(3): 86 | 1839 |
| Poaceae | ** |
Holcus ventricosus
| Fisch. ex Trin. | Mém. Acad. Imp. Sci. Saint-Pétersbourg, Sér. 6, Sci. Math., Seconde Pt. Sci. Nat. 5(2, Bot.): 88 | 1839 |
| Poaceae | |
Holcus virgatus
| (Hack.) Bailey | Gentes Herbarum 1: 132 | 1923 |
| Poaceae | ** |
Holcus virginicus
| Muhl. ex Steud. | Nomencl. Bot. (ed. 2) 1: 773 | 1840 |
| Poaceae | |
Holcus zizanioides
| (L.) Kuntze ex Stuck. | Anales Mus. Nac. Buenos Aires 11: 48 | 1904 |