454 COMPOSITAE 
111. CROCIDIUM Hook. FI. Bor. Amer. 1: 335. 1834. 
Heads radiate, the rays pistillate and often fertile, yellow. Involucre a single series of 
rather broad, herbaceo ous, equal bracts. Receptacle poe conic, sia Disk-flowers 
n 
basal, entire or few-toothed leaves and ne er small, long-pedunculate heads. [Name a 
diminutive derived from the Greek croce, loose thread or wool, referring to the persistent 
axillary tomentum. ] 
single species, of doubtful affinities. 
1. Crocidium multicaule Hook. Spring Gold. Fig. 5792. 
Crocidium persian Hook. Fl. Bor. Amer. 1: per 1834. 
Crocidium eli el e St. John, Torreya 28: 74. 1928 
cate, eenerall several-stemmed ue up to 1.5 or rarely 3 dm. a bearing loose tufts 
ra : 
c 
naked-pedunculate, solitary at the ends of the simple unbranched stems; rays 5-13, typically 8, 
4-10 mm. long, fertile or sterile, Peet ali subtended by the thin and. m embranous involucr al 
bracts, these 3-7 mm. long; disk ‘about 1 cm. wide r les 
and plains, cliff ledges, and other dry open ehia at lh Na Worcs pense and Transition sons 
the 9 ale trough from southern Weneoucer Island to southern Oregon, extending eastward along and near the 
Columbia River to the oor of the Blue Mountains in Walla Walla Coane, Washington, ch oe County, 
; n t i ton, and 
112. PETASITES [Tourn.] Mill. Gard. Dict. abr. ed. 4. 1754. 
Heads radiate or discoid, subdioecious, the flowers in the female heads all or nearly all 
pistillate | and fertile, with or without rays, thos ose in the male heads chiefly or entirely her- 
aph 
divided or nearly so. Achenes linear, 5—10-ri ; pappus of numerous capillary sph 
elongating in fruit, that of the sterile flowers more or less reduced. More or less w 
tomentose or woolly perennial herbs See large basal leaves, merely biactedte stems (the 
ae apoio | and several or numerous medium-sized, purple, white, or rarely yellowish 
hea 1 ame from the Greek Reais. a road brim ne ae Selene to the large basal 
re 
s of about 12 species, native to the cooler parts of the northern hemisphere. Type species, Tussilago 
pene ay ie Petasites hybridus (L.) Gaertn., Mey. & Scherb.) 
Leaves evidently lobed, varying to rire few-toothed with 5-15 teeth on each side; chiefly in ~ escae region 
and westward (and in the California Coast Ranges). gidus. 
Leaves varying from merely a little wavy and Siow ion to more commonly consicwouy, Fes =e 
20-45 teeth on each side; northeastern Washington northward and eastward. . P. sagittatus 
1. Petasites frigidus (L.) Fries. Sweet Coltsfoot. Fig. 5793. 
Tussilago frigida L. Sp. a 865. 1753. 
Tusstlago corymbosa R. Br. Chior. Melv. 21. 1823. 
Nardosmia frigida Hook. FL. mi ioe 1: 307. 1833. 
Nardosmia corymbosa Hook. 
Petasites frigidus Fries, eat Veg. s  acel d. 182. 1845. 
Nardosmia frigida var. corymbosa sa Herder, Bull. Soc. es atch Nat. Mosc, 38: 372. 1865. 
Petasites corymbosa Rydb. Bull. Torrey Club 37: 
Petasites warrenti St. — meeps Sacha St: nas Wash, ‘ 109, 1929. 
Petasite tig us var. ionaaiing se Ate iens 48: 123. 1946. 
Per asal leaves expanding with or shortly after the flowers, 
bier geet anon or or glbrate ab above loosely cl gaarst ew beneath, sometimes eventually 
glabrate, of various sizes up to 1. 5 or rarely 2 dm. wide, coarsely few-toothed or very shallowly 
pinnipal y Siig: a em erec s "1-5 dm. tall, with @ approximately or imbricate parellel- 
veined bracts most mostly 2.5~6 cm the upper 
yr and more pth heads several or rather numerous in a corymbiform or 
