C. NAUSEOSU8. 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 R(?.servation, northern Arizona. 



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

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

 in a more restricted sense. His first cited synonym is the same as C. nauseosug typicus, but subsjjecies graveolens 

 is included among the other synonyms and in the description. 



49. C. NAUSECSUS ALBICAULI8 Rydbcrg, Mem. N. Y. Bot. Gard. 1:385, 1900. — C. nauseosxis subspwcies 

 albicaulis, at least as to synonymy. 



50. C. NAUSECSUS Vars. BERNARDINUS, bigelovi, CERUMINOSUS, CCN.SIMILIS, GLARE0SU8, GNAPHALODES, 

 GRAVEOLENS, HCLCLEUCUS, JUNCEUS, LATLSQUAMEUS, LEIO.SI'KUMUS, MOHAVENSIS, OCCIDENTALIS, PINIFOLIU8, 



8ALICIF0LIUS, sPECicsus, and viRiDULUs, all Hall, Univ. Calif. Publ. Bot. 7:160 to 180, 1919, are here trans- 

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



51. C. NAUSECSUS BERNARDINUS, but the twigs, leaves, and involucres white with a floccose tomentum. 

 Above the Mill Creek Falls, San Bernardino Mountains, California, Parish 1133 (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 speciosua 

 but the form is too little knov\7i 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. NAUSECSUS var. californicus Hall, 1. c, 174, 1919. — As to synonymy, this is the same as C. cali- 

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

 specimen cited belong to C. parryi holarideri. 



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



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

 graveolens Nuttall, here transferred to Chrysothamnus nauseosxis subspecies graveolens. 



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



56. C. NAUSECSUS var. plattensis Hall, 1. c, 170, 1919. — Based on C. speciosws pZoWeniis Greene, which see. 



57. C. NAUSECSUS sPECicsus, 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: Leiberg906, 910, 924, and 946, all from 

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

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

 bracts and longer corolla-lobes and style-appendages. 



58. C. NAUSECSUS SPECicsus, but a form wth hea\'y 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 fuU 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 12945), 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. 

 californicus (No. 25 of this list). 



59. C. NAUSECSUS VIRIDULUS. — A dwarf form of the alkali flats of Antelope Valley, southern California, 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 105S2 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. ccciDENTALis Greene, Fl. Francisc. 369, 1897. — C. nauseosus occidentalis. 



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

 slightly wider upper leaves. Perhaps intermediate to subspecies graveolens. The type is Nelson 4105 from 

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



62. C. ORECPHILUS ARTUs Nclson, 1. c, 54:413, 1912. — Not distinguishable from C. nauseosus consimilis. 

 Type locality, Boise, Idaho. 



63. C. crthcphyllus 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. 



