| Asteraceae | |
Xanthocephalum alamani
| (A. Gray) Benth. | Gen. Pl. 2: 249 | 1873 |
| Asteraceae | |
Xanthocephalum amoenum
| Shinners | Field & Lab. 19(2): 77–78 | 1951 |
| Asteraceae | |
Xanthocephalum arizonicum
| (A. Gray) Shinners | Field & Lab. 18(1): 28 | 1950 |
| Asteraceae | |
Xanthocephalum benthamianum
| Hemsl. | Biol. Cent.-Amer., Bot. 2(8): 110 | 1881 |
| Asteraceae | ! |
Xanthocephalum bonplandianum
| (Kunth) Less. | Syn. Gen. Compos. 252 | 1832 |
| Asteraceae | ** |
Xanthocephalum bonplandianum
| (Kunth) DC. | Prodr. 6: 44 | 1837 [1838] |
| Asteraceae | |
Xanthocephalum californicum
| (DC.) Greene | Man. Bot. San Francisco Bay 171 | 1894 |
| Asteraceae | ! |
Xanthocephalum centauroides
| Willd. | Mag. Neuesten Entdeck. Gesammten Naturk. Ges. Naturf. Freunde Berlin 1: 140 | 1807 |
| Asteraceae | |
Xanthocephalum conoideum
| Hemsl. | Biol. Cent.-Amer., Bot. 2(8): 110–111 | 1881 |
| Asteraceae | |
Xanthocephalum dentatum
| (S. Schauer) Hemsl. | Biol. Cent.-Amer., Bot. 2(8): 111 | 1881 |
| Asteraceae | |
Xanthocephalum digynum
| (S.F. Blake) Shinners | Field & Lab. 18(1): 28 | 1950 |
| Asteraceae | |
Xanthocephalum discoideum
| (A. Gray) Shinners | Field & Lab. 18: 28, in adnot. | 1950 |
| Asteraceae | |
Xanthocephalum dracunculoides
| (DC.) Shinners | Field & Lab. 18(1): 28 | 1950 |
| Asteraceae | |
Xanthocephalum durangense
| M.A. Lane | Syst. Bot. 8(3): 311, f. 3 | 1983 |
| Asteraceae | |
Xanthocephalum eradiatum
| (M.A. Lane) G.L. Nesom | Phytologia 66(6): 485 | 1989 |
| Asteraceae | |
Xanthocephalum glutinosum
| (Spreng.) Shinners | Field & Lab. 18(1): 29 | 1950 |
| Asteraceae | |
Xanthocephalum grande
| (S.F. Blake) Shinners | Field & Lab. 18(1): 28 | 1950 |
| Asteraceae | |
Xanthocephalum gymnospermoides
| (A. Gray) Benth. & Hook. f. | Gen. Pl. 2(1): 249 | 1873 |
| Asteraceae | ! |
Xanthocephalum humile
| (Kunth) Benth. & Hook. f. | Gen. Pl. 2: 249 | 1873 |
| Asteraceae | ** |
Xanthocephalum humile
| (Kunth) Sch. Bip. ex Hemsl. | Biol. Cent.-Amer., Bot. 2(8): 111 | 1881 |
| Asteraceae | |
Xanthocephalum linearifolium
| (DC.) Greenm. | Publ. Field Mus. Nat. Hist., Bot. Ser. 2(8): 345 | 1912 |
| Asteraceae | |
Xanthocephalum longipappum
| (S.F. Blake) Shinners | Field & Lab. 18(1): 29 | 1950 |
| Asteraceae | |
Xanthocephalum lucidum
| Greene | Pittonia 2(11D): 282 | 1892 |
| Asteraceae | |
Xanthocephalum megalocephalum
| Fernald | Proc. Amer. Acad. Arts 36: 505 | 1901 |
| Asteraceae | |
Xanthocephalum microcephalum
| (DC.) Shinners | Field & Lab. 18(1): 29 | 1950 |
| Asteraceae | |
Xanthocephalum microglossum
| (Spruce ex Benth.) Benth. | Gen. Pl. 2: 249 | 1873 |
| Asteraceae | |
Xanthocephalum petradoria
| S.L. Welsh & Goodrich | Brittonia 33(3): 301–302, f. 7 | 1981 |
| Asteraceae | |
Xanthocephalum ramulosum
| (Greene) Shinners | Field & Lab. 18(1): 28 | 1950 |
| Asteraceae | |
Xanthocephalum sarothrae
| (Pursh) Shinners | Field & Lab. 18(1): 29 | 1950 |
| Asteraceae | |
Xanthocephalum sericocarpum
| A. Gray | Proc. Amer. Acad. Arts 15(1): 31–32 | 1880 [1879] |
| Asteraceae | |
Xanthocephalum sphaerocephalum
| (A. Gray) Shinners | Field & Lab. 18(1): 29 | 1950 |
| Asteraceae | |
Xanthocephalum suffruticosum
| DC. | Prodr. 6: 44 | 1837 [1838] |
| Asteraceae | |
Xanthocephalum tenue
| (Greene) Shinners | Field & Lab. 18(1): 29 | 1950 |
| Asteraceae | |
Xanthocephalum texanum
| (DC.) Shinners | Field & Lab. 18(1): 28 | 1950 |
| Asteraceae | |
Xanthocephalum tomentellum
| B.L. Rob. | Proc. Amer. Acad. Arts 27: 172 | 1892 |
| Asteraceae | |
Xanthocephalum wrightii
| (A. Gray) A. Gray | Proc. Amer. Acad. Arts 8: 632 | 1873 |