220 GENUS CHRYSOTHAMNUS. 



27. C. CERUMINOSUS Greene, 1. c, 94, 1895. — C. nmtseosus ceruminosvs. 



28. C. COLLINUS Greene, Pittonia 3 : 24, 1896. — A variation of C. nauseosus typicus in which the inflorescence 

 is reduced and the bracts are exceptionally acute. Described as "not tomentose, only obscurely cinereous and 

 notably gummy." The type in the Greene Herbarium has the tvngs heavily coated vnih a compact tomentum, 

 as in all of the subspecies. Type locality. Rock Springs, Wyoming. 



29. C. CONCOLOR Rydberg, Fl. Rocky Mts. 856, 1917. — Based upon C.frigidus concolor, which see. 



30. C. CONFIMS Greene, Pittonia 5:62, 1902. — Here regarded as a southern variation of C. nauseosus pini- 

 folius, notwthstanding its short-ciliate bracts (described as obtuse but decidedly acute in specimens of the type 

 collection) and its occasionally longer heads. Type locality, White Mountains of southern New Mexico. 



31. C. coNSiMiLis Greene, Pittonia 5:60, 1902. — C. nauseosus consimilis. 



32. C. DRACUNCULoiDEs Nuttall, Trans. Am. Phil. Soc. II, 7:324, 1840. — Based upon Bigelovia dracuncu- 

 loides, which see. 



33. C. FALCATUs Greene, 1. c, 62, 1902. — C. nauseosus pinifolius with the twigs and upper (not lower) surface 

 of the leaves coated with a white tomentum, which is deciduous in places. Other differentiating characters 

 have been studied by Hall and found to be of no moment (Univ. Calif. Publ. Bot. 7: 176, 1919). Type locality, 

 plains about Grand Junction, Colorado. 



34. C. FORMO.SUS Greene, Pittonia 4:41, 1899.— Payson, Bot. Gaz. 60, 381, 1915. Very close to C. nauseosus 

 albicaidis and probably to be accepted as a minor variation of this, although perhaps derived locally from sub- 

 species speciosus, as albicaidis is supposed to have been elsewhere. Known only from Naturita, southwestern 

 Colorado. A low, matted, white shrub with narrow spreading leaves, the involucres 10 mm. long and with 4 

 to 6 bracts in each row, the outer bracts puberulent. Type coDected by Greene, August 27, 1896 (Herb. 

 Greene 26614). Additional collection, Payson 605 (Gr, St. Louis). 



35. C. FRiGiDus Greene, Erythea 3: 112, 1895. — In describing this, Greene did not indicate a type specimen, 

 but his reference to its abundance about Laramie, Wyoming, leads to the assumption that specimens there 

 collected by him July 29, 1889, and labeled by him as frigidtis are the ones from which the description was 

 drawn. These specimens are now in the Greene Herbarium and in the University of California, where Greene 

 was working at the time. The evidence from these sheets and from the description leaves no doubt that C. 

 frigidus is the same as C. nauseosus typicus. In fact, Greene himself suggested this possibility. A slightly 

 different form, described by Greene as C. speciosus var.(?) platteyisis and later raised to specific rank, is now also 

 included in typicus. This differs horn frigidus in having a lax foliage, the leaves spreading or recurved and the 

 bracts glabrous except along the margins. Both forms are common on the Rocky Mountain plains, but their 

 separation taxonomically is almost impossible. The inner bracts even in frigidus are never very pubescent and 

 most specimens necessarily referred here because of their straight, ascending leaves, have the bracts exactly as in 

 plattensis, that is, pubescent only on the margins, or the short outermost ones slightly pubescent also on the back 

 (for example, Goodding 19SS and 2069 and Nelson 8786). Furthermore, many plants with the lax, narrow foli- 

 age of plattensis have all of the bracts tomentulose as in frigidus (for example, Goodding 588, UC, and And£rson 

 89 and 393, UC). Tlierefore, the only satisfactory treatment is to include in typicus plants with either straight 

 or curved leaves and vnth bracts varying from glabrous to puberulent. The type of the species is discussed 

 under Chrysocoma nau.'ieosa of this list. 



36. C. FRIGIDUS var. concolor Nelson, Bot. Gaz. 28:371, 1899. — C. nauseosus typicus but with a pale yel- 

 lowish-green herbage and somewhat elongated inflorescence. The leaves are straight, flat, and ascending, 

 the bracts of the involucre mostly puberulent but the innermost only ciliate. Type locality, Hutton Lakes, 

 Wyoming. 



37. C. GLAREOSUs Rydberg, Fl. Rocky Mts. 858, 1917. — Based upon Bigelovia glareosa, which see. 



38. C. GNAPHALODES Greene, Pittonia 4:42, 1899. — C. nauseosus gnaphalodes. 



39. C. GRAVEOLENS Greene, Erythea 3: 108, 1895. — C. nauseosus graveolens. 



40. C. GRAVEOLENS GLABRATA Nelson, in Coulter and Nelson, Man. Rocky Mts. 496:1909. — Based upon 

 Bigelovia graveolens glabrata, which see. 



41. C. JUNCEUS Greene, Erythea 3:113, 1895. — C. nauseosus junceus. 



42. C. LAETEVIRENS Greene, Pittonia 5:61, 1902. — A light green form or state of C. nauseosus graveolens 

 gathered at Grand Junction, Colorado. 



43. C. LATisQUAMEUs Grecnc, 1. c, 4:42, 1899. — C. nauseosus latisguameus. 



44. C. LEiosPERMUS Greene, Erythea 3:113, 1895. — C. nauseosus leiospermus. 



45. C. MACOUNi Greene, Pittonia 5 : 63, 1902. — Best referred to C. nauseosus albicaidis, although the corolla- 

 tube is not arachnoid and the habit suggests that of the plattensis form of subspecies typicus, as noted by Greene. 

 But the corollas are 8.5 to 9 mm. long, therefore longer than in typicus, and the involucre also is longer (8.5 to 

 9 mm.). The type specimen gives no indication that the plants are low in stature. Type, Lytton, British 

 Columbia, August 30, 1887, Macoun (Herb. Greene). 



46. C. MOHAVENSis Greene, Erythea 3:113, 1895. — C. nauseosus mohavensis. 



47. C. MOQUiANUs Greene, Pittonia 5:60, 1902. — C. nauseosus bigelovi. Greene says "achenes not seen," 

 but the specimen marked as the type in his herbarium has well-formed achenes and these axe glabrous, as in 



