

1920] SHERFF— TARAXACUM 359 



EXPLANATION OF PLATES XXXI-XXXIII 



PLATE XXXI 



Taraxacum lyrata 



Figs, a and j (X0.48). T. alaskanum form: Coville and Kearney ioq7, 

 Haenke Id., Hb. U.S. 376702; figs, b and/ (X0.48), foliage form typical as 

 to Ledebour's type illustration, but plants less compound at base than 

 figured by Ledebour, Coville and Kearney 2164, St. Matthew IsL, Hb. U.S. 

 376718; figs, c, g, and i (Xo.63), showing (c) foliage form of T. lyratum that 

 corresponds to T. mutilum form of T. ceratophorum and matches type figures of 

 T. hyperboreum Dahlst. and T. eurylepium Dahlst., (g) foliage form matching 

 Vahl's type plate of T. phymatocarpum, and (i) foliage form of T. lyratum 



t 



more nearly approaching that of Ledebour's plate, all three from Walpole 1791, 

 Alaska, Hb. U.S. 378905; fig. d (X0.56), from type sheet of T. alaskanum, 

 Mcllhenny in, Alaska, Hb. N.Y.; fig. e (X0.52), topotype of T. alaska- 

 num, Murdoch, Alaska, Hb. U.S. 424063; fig. h (X0.70), foliage form 

 closely matching some of more erect "T. phymatocar pum" forms from Green- 

 land, Knowlton 142, Arizona, Hb. U.S. 41949; fig. k (X0.79), tiny dwarf 

 form of Rocky Mts. (T. officinale var. scopulorum Gray), Baker, Earle, and 

 Tracy 293, Colorado, Hb. U.S. 76097; fig. / (X0.67), from type sheet of T. 

 rupestre, Macoun, British Columbia, Hb. Can. 151 n. 



PLATE XXXII 



Taraxacum ceratophorum 



Fig. a (X0.47), — Type material of T. mutilum, Glenn, Alaska, Hb. U.S. 

 376755 ; fig. b (Xo . 36), from type sheet of T. lacerum, Dawson, northern British- 

 Columbia boundary, Hb. Can. 151 19; fig. c (X0.44), type plant of T. leiosper- 

 mum; Osterhout 2645, Colorado, Hb. N.Y.; fig. d (X 0.47), authentic material 

 of T. Chamissonis, Cole, St. Paul IsL, Hb. U.S. 376691; fig. e (Xo. 37), from 

 one of type sheets of T. dumetorum, Greene, Wyoming, Hb. Green 48431. 



PLATE XXXIII 



Taraxacum eriophorum 



* 



Fig. a (X0.64). — From type sheet of T. eriophorum, Mrs. Fitch, Montana, 

 Hb. Mont. Agric. Exper. Station; fig. b (X0.52) from one of type sheets of 

 T. angustifolium, Greene, Wyoming, Hb. Greene 4 8 45i; fig- c (X0.59), from 

 type sheet of T. ovinum, Macoun, Alberta, Hb. Can. 11711; fig. d (X0.47), 

 from type sheet of T. ammophilum, Nelson, Wyoming, Hb. Greene 48427. 



