Checklist of Bolivian Compositae - Royal Botanic Gardens, Kew

Xanthium acutum Greene, Pittonia 4(21): 62 (1899). Type: ‗Known by a single specimen obtained at Stockton,
California, by Mr. J. A. Sanford, in 1888.‘ Holotype: originally LCU but probably now in WIS. [qv. Tucker et
al. 1989: 202]
Xanthium palustre Greene, Pittonia 4(21): 63 (1899). Type: ‗Known only from the brackish marshes of Suisun
Bay, middle California. An exceedingly well marked species, referred to by me as an indiginous state of X.
Canadense in the Flora Franciscana.‘ Holotype: ?
Xanthium acerosum Greene, Pittonia 4(21): 63 (1899). Type: ‗Known only from the valley of the Red River of
the North, where it was collected by the writer [E.L. Greene], near Fargo, North Dakota, 4 Sept., 1893.‘
Holotype: originally at LCU.
Xanthium glabratum (DC.) Britton, Man. Fl. North. States Canad. : 912 (1901).
Xanthium commune Britton, Man. Fl. North. States Canad. : 912 (1901). Type: ‗Type collected by N. L. Britton
at Westport, N.Y.‘
Xanthium macounii Britton, Man. Fl. North. States Canad. : 913. (1901). Type: ‗Goose Island, Lake Winnipeg,
Manitoba, J. M. Macoun, Aug. 16, 1884. Specimen in the herbarium of the Geological and Natural History
Survey of Canada.‘
Xanthium inflexum Mack. & Bush, Rep. (Annual) Missouri Bot. Gard. 16: 106 (1905). Type: ‗Sandy bottoms
along the Missouri River in western Misosuri. … MISSOURI: Courtney, Bush 869, September 13, 1900, 1916,
October 5, 1903, type, 1804, 1806, October 21, 1902.‘ Holotype: MO.
Xanthium oligacanthum Piper, Contr. U.S. Natl. Herb. 11: 551 (1906). Type: ‗Bolles, Walla Walla County, Piper,
September 18, 1893; also found at Waitsburg by Horner (no. B272). The type is in the National Herbarium.‘
There is a specimen marked as ‗holotype‘ in US (528824), although clearly this can only be a syntype.
Xanthium bubalocarpon Bush, Rep. (Annual) Missouri Bot. Gard. 17: 123 (1906). Type: ‗TEXAS. Dallas County,
[Common on prairie.] Bush 1185, September 29, 1900.‘ Holotype: ?MO; isotype: US (386828).
Xanthium wootoni Cockerell ex De Vries, Sp. Var. (Ed. 2) : 140 (1905). Type: ‗Last year a very curious instance
of a partial loss of prickles was discovered by Mr. Cockerell of East Las Vegas in New Mexico. It is a
variety of the American cocklebur, often called sea-burdock, or the hedgehog-burweed, a stout and
common weed of the western States. Its latin name is Xanthium canadense or X. commune and the form
referred to is named by Mr. Cockerell X. Wootoni, in honour of Professor E. O. Wooton who described the
first collected specimens.‘
Xanthium barcinonense Sennen, Bull. Géogr. Bot. 24(Nos. 295–297): 224 (1914). Type/s: ‗Hab.–Catalogne:
Barcelone à Can Tunis et à la Farola; Prat del Llobregat.‘ Syntypes: ?
Xanthium globosum C. Shull, Bot. Gaz. 59: 482 (1915). Type: not cited. Note: Shull noted earlier in the
discussion that ‗this variety was first seen on the Campus of the State University of Kentucky several years
ago. … It has been found to breed true …‘ Note: there is a duplicate of material cultivated from the ‗type‘
donated to K by Sherff.
Xanthium pensylvanicum Gand., Bull. Soc. Bot. France 65: 54 (1918), nom. illegit. non Wallr. (1844). [Type:
‗Hab.: America bor., Pensylvania Delaware ad Darby Creek (Mac Elwee n. 1316!).]
Xanthium leptocarpum Millsp. & Sherff, Publ. Field Mus. Nat. Hist., Bot. Ser. 4(1): 3 (1918). Type: ‗L. R. Jones,
Burlington, Vermont, September 12, 1896 (type in Herb. Field Museum, cat. no. 430860).‘ Holotype: F
(430860).
Xanthium arcuatum Millsp. & Sherff, Publ. Field Mus. Nat. Hist., Bot. Ser. 4(1): 4 (1918). Type: ‗T.F. Lucy, river
shores and low places, Chemung County, New York, October 11, 1896 (type in Herb. Field Museum, cat.
no. 4953). Holotype: F (4953).
Xanthium cylindricum Millsp. & Sherff, Publ. Field Mus. Nat. Hist., Bot. Ser. 4(1): 4 (1918). Type: ‗J.K. Small and
A. M. Huger, Chimney Rock to Hendersonville, North Carolina, October 3, 1901 (type in Herb. Field
Museum, cat. no. 401312).‘ Holotype: F (401312).
Xanthium acutilobum Millsp. & Sherff, Publ. Field Mus. Nat. Hist., Bot. Ser. 4(1): 6 (1918). Type: ‗J. Reverchon,
Oak Cliff, Texas, September 2 (type in Herb. Missouri Botanical Garden no. 85603; duplicate sheets in the
same herbarium bear the numbers 85470 and 85485).‘ Holotype: MO; isotypes: MO × 2.
Xanthium crassifolium Millsp. & Sherff, Publ. Field Mus. Nat. Hist., Bot. Ser. 4(1): 5 (1918). Type: ‗B. Mackensen
123, San Antonio, Texas, October 8 and November 15, 1911 (type in Herb. Field Museum, cat. no. 324122)‘.
Holotype: F (324122).
Xanthium curvescens Millsp. & Sherff, Publ. Field Mus. Nat. Hist., Bot. Ser. 4(2): 25 (1919). Type: ‗VERMONT:
Orwell, Willard W. Eggleston 1420 [Sept. 23 1899] (type in Hb. Gray).‘ Holotype: GH (14158); isotype: US
(364400).
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