523] Compositae 541 
Xanthium saccharatum Wallr. emend. Widd.1.c. p.86 (= X.orientaleCavan.— X. 
strumarium H.B.K. = X. occidentale Bertol. = X. canadense Spr. =X. 
macrocarpum DC. — X. strumarium L. ß. canadense Torr. et Gray = X. 
saccharatum Wallr. = X. Cavanillesii Schouw — X. italicum Körn. = X. 
macrocarpum subsp. italicum Nym. = X. canadense Gray var. echinatum 
Gray = X. strumarium y. echinatum Ktze. = X. speciosum Kearney = X. 
varians Greene = X. affine Greene = X. silphiifolium Greene = X. 
glanduliferum Greene = ? X. acutum Greene = X. acerosum Greene — X. 
commune Britton = X. Macounii Britton = X. commune Wootoni Cockerell 
— X. pennsylvanicum Small = X. bubalocarpum Bush = X. echinatum 
Thell. p. pte. = X. orientalum var. echinatum Tuzson). 
var. silphiifolium (Greene subspec.) Widder s. str. 1.c. p. 92. — Nord- 
Amerika. 
var. Wootoni (Cockerell) Widder 1. e. p. 93 (= X. commune Wootoni 
Cockerell = X. Wootoni Auct. =X. canadense var. Wootoni Cocke- 
rell in sched.). — Nord-Amerika. 
X. riparium Itzigsohn et Hertsch f. laciniatum (Aschers.) Widder ]l. e. p. 105. 
(= X. italicum lusus laciniatum Aschers. — X. echinatum lusus laciniatum 
Thell. = X. echinatum var. laciniatum Hegi). — Kreis Angermünde. 
X. riparium Itzigs. et Hertsch var. albinum Widder ]l. c. p. 105. Taf. Ill. 
Fig. 34. — Elbtal. 
X. californicum (Greene) emend. Widder ]l. ec. p. 110. Taf. III. Fig. 37—38. 
Taf.5 (= X. canadense Hook. et Walk.-Arn. = X. strumarium ß. canadense 
Torr. et Gray p. pte. = X. strumarium var. echinatum Hillebr. — X. cali- 
fonnicum Greene — ? X. palustre Greene — X. oligacanthum Bip. X. 
echinatum Thell. p. pte. — ? X. strumarium ß. canadense Torr. et Gray 
— X. californicum et |?] palustre Greene an var.?, non Murray, nec Wallr. . 
— X. orientale var. canadense Tuzson p. pte. = X. orientale var. macro- 
carpım Tuzson p. pte.). — Nord-Amerika, Hawaii-Inseln. 
var. oligacanthum (Piper p. spec.) Widder]. c. p. 113. Taf. IV. Fig. 39. — 
Washington. 
var. rotundifolium Widder 1. e. p. 114. — California. 
X. argenteum Widder 1. ec. p. 118 (=X. catharticum Philippi in Sched., non 
H.B.K.). — Chile. 
X. canescens (Costa y Cuxart pro var. X. spinosi) Widder l.c. p.121. Taf. IV. 
Fig. 45 (= X. spinosum var. canescens Costa y Cuxart = X. chrysacanthum 
Costa y Cuxart in sched.). — Süd-Amerika, Spanien, Frankreich: 
x X. Shullii Widder 1. ec. p. 139 (= X. pungens x saccharatım Widder ). — 
Maryland (Shull n. 390, Herb. Wash.), Michigan (Dodge n.4, Herb. 
'Wash.), Kansas (Norton n. 261, Herb. Wash.). 
x X. Bushii Widder ]. ec. p. 140 (= X. inflexum x saccharatum Widder). — 
Missouri (Bush n. 1916, Herb. Wash.). 
X. pungens var. globosum (Shull pro spec.) Widd. 1. c. p. 166 (= X. globosum 
Shull). — Missouri, Kansas. 
var. cylindricum (Millsp. et Sherff pro spec.) Widder |. e. p. 167 (= X. 
cylindricum Millsp. et Sherff).. — Nord-Carolina. 
Zexmenia iners Blake in Journ. Wash. Acad. Sci. XIII (1923) p. 145 et in 
Standley and Calderön: La Lista prelim. de las Plantas en El Salvador 
(San Salvador 1925) p. 230. — Salvador (Standley n. 23498. 19414. 
23300. 22259). 
