C. NAUSEOSUS. 221 



bigelovi. The habit and also the details of involucre and flowers are exactly as in the usual form of this sub- 

 species. Type locality, Moqui Indian Reservation, northern Arizona. 



48. C. NAUSEOSUS (Pallas) Britton, in Britton and Brown, 111. Fl. 3:326, 1898.— This i« the proper combi- 

 nation and authority for all of the subspecies here assembled under C. nauseosxis, although Britton used the name 

 in a more restricted sense. His first cited synonym is the same as C. nauseosus typicim, but subspecies graveolens 

 is included among the other sjTionyms and in the description. 



49. C. NAUSEOSUS ALBiCAULis Rydberg, Mem. N. Y. Bot. Gard. 1:385, 1900. — C. nameosus subspecies 

 albicaulis, at least as to synonymy. 



50. C. NAUSEOSUS vars. bernardinus, bigelovi, ceruminosus, consimilis, glareosus, gnaphalodes, 



GRAVEOLENS, HOLOLEUCUS, JUNCEUS, LATISQUAMEUS, LEIOSPERMUS, MOHAVENSIS, OCCIDBNTALIS, PINIFOLIUS, 



salicifolius, speciosus, and viridulus, all Hall, Univ. Calif. Publ. Bot. 7:160 to 180, 1919, are here trans- 

 ferred to subspecies of C. nauseosus without change of name. 



51. C. NAUSEOSUS bernardinus, but the twigs, leaves, and involucres white with a floccose tomentum. 

 Above the Mill Creek Falls, San Bernardino Mountains, California, Parish IISS (DS). Probably grows also 

 on San Jacinto Mountain, as indicated by an incomplete specimen from the lower edge of the pine belt on the 

 north side (Hall 10701). Apparently bears the same relation to bernardinus that albicaulis does to speciosus 

 but the form is too little knowTi to permit of final taxonomic treatment at this time. According to Parish, 

 the white form is not rare in the San Bernardino Mountains, where it grows with the gray or greenish form. 



52. C. NAUSEOSUS var. californicus Hall, 1. c, 174, 1919. — As to synonymy, this is the same as C. calv- 

 fornicus of the present list, and therefore a form of C. nauseosus albicaulis. However, the description and 

 specimen cited belong to C. parnji bolaiideri. 



53. C. NAUSEOSUS var. frigidus Hall, 1. c, 170, 1919. — Based upon C. frigidus Greene, which see. 



54. C. NAUSEOSUS var. graveolens Piper, Contr. U. S. Nat. Herb. 11:559, 1906. — Based upon Chrysocoma 

 graveokns Nuttall, here transferred to Chrysothamnus nauseosus subspecies graveolms. 



55. C. NAUSEOSUS var. oreophilus Hall, 1. c, 175, 1919. — Based on C. oreophilus Nelson, which see. 



56. C. NAUSEOSUS var. plattensis Hall, 1. c, 170, 1919. — Based on C. speciosus plattensis Greene, which see. 



57. C. NAUSEOSUS SPECIOSUS, but the dense gray tomentum extending even to the inner bracts of the invo- 

 lucre; the variation not named. (Plate 33, fig. 1.) Waitsburg, southeastern Washington, Horner 413 (UC); 

 near Clear Creek, Butte County, California, Brown 46 (DS, UC). These are very much like the type of speci- 

 osus, except that in this the tomentum stops abruptly with the lower bracts of the involucre. Specimens referable 

 to this variation, but with the involucre less densely tomentose, are: Leiberg 906, 910, 924, and 946, all from 

 eastern Oregon. Still less pubescent, the inner bracts nearly glabrous, is a plant from Ogden, Utah {Slilwell, UC). 

 The heavily tomentose specimens have been sometimes identified as gnaphalodes, but differ in the very acute 

 bracts and longer coroUa-lobes and style-appendages. 



58. C. NAUSEOSUS SPECIOSUS, but a form with heavy leaves 2 to 3 mm. wide and close rounded cymes; the 

 form not named, except as included in the original C. californicus Greene. This is a common type in eastern 

 and northern California, and western Nevada, and is very strikingly different in its full development. It is 

 represented by the collections so indicated in the citations under subspecies speciosus. The abundance of this 

 form toward the south indicates that it may be a geographic ecad or race. Intermediates are plentiful in the 

 intervening territory (Butler 1824; Heller 12946), and also to the eastward (Utah, Jones 503; Wyoming, Bran- 

 degee). It is probable that some collections of this variation were included in Greene's conception of his C. 

 calif amicus (No. 25 of this list). 



59. C. NAUSEOSUS VIRIDULUS. — A dwarf form of the alkali flats of Antelope Valley, southern Cahfbrnia, is 

 referred here provisionally. It has flexuous stems, short rounded inflorescences, and exceptionally small 

 flowers (commonly 6 or 7 in a head), but the flowers, although reduced in size, have the narrow, elongated, and 

 spreading lobes of viridulus. Representative collections are Hall 10582 and 10587, both from near Lancaster. 

 More nearly typical specimens have been gathered in the San Antonio Mountains at an altitude of 2,440 m. 

 (Johnston 1706). 



60. C. occidentalis Greene, Fl. Francisc. 369, 1897. — C. nauseosus occidentalis. 



61. C. OREOPHILUS Nelson, Bot. Gaz. 28:375, 1899. — A low form of C. rmuseosris consimilis with erect and 

 slightly wider upper leaves. Perhaps intermediate to subspejies'jrareo^ens. The type is Nelson 4105 from 

 Evanston, Wyoming. Other specimens distributed under this name are mostly subspecies speciosus and typicus. 



62. C. OREOPHILUS ARTUS Nelson, 1. c, 54:413, 1912. — Not distinguishable from C. nauseosus consimilis. 

 Type locality, Boise, Idaho. 



63. C. ORTHOPHYLLUs Greene, Pittonia 5 : 62, 1902.— C. nauseosus albicaulis, but with the lobes of the corolla 

 sparsely villous. The value of this character has been already discussed (p. 167). Type locality, Big 

 Meadows, Plumas County, California. 



64. C. PALLiDUs Nelson, Bot. Gaz. 28 : 372, 1899. — C. nauseosus typicus, but the herbage nearly white with 

 a very smooth, close, persistent tomentum and the short leaves crowded near the top. The type is from alka- 

 line flats near Laramie, Wyoming, and the form occurs elsewhere in alkaline soil of Wyoming and northern 

 Colorado. 



