C. VISCIDIFLORUS. 185 



this to extreme cases in which a blade will make two complete revolutions on its axis. Since this character is 

 thus variously developed and fails to run parallel with any other tendency, and since it is encountered in all of 

 the subspecies (with the possible exception of the firm-leaved linif alius), it is not here considered as of diagnostic 

 value. Especially misleading is the common custom of identifying any specimen with tortuous leaves as "tor- 

 tifolius," quite regardless of its other features. 



10. B. GLAUCA Schumann, Just's Bot. Jahresb. 26': 375, 1900. — Based upon C. glaucm, and therefore a form 

 of C. viscidifloriis iypicus. (See No. 16 of this list.) 



ll._ B. LANCEOLATA Gray, 1. c, 639, 1873. — C. viscidiflorus lanceolatus. 



12.' B. LiNiFOLiA Nelson, First Rept. Fl. Wyo. 123, 1896.— C. viscidiflorus linifolim. 



13. B. visciDiFLORA De Candolle, Prodr. 7:279, 1838. — Based upon Crinitaria visddiflora Hooker, No. 39 

 of this list. 



14. Chrysothamnus douglasi Clements and Clements, Rocky Mt. Fls. 266, 1914. — C. viscidiflorus, includ- 

 ing several of the subspecies. 



15. C. ELEGANS Greene, Erythea 3:94, 1895.— C. viscidiflorus elegans. 



16. C. GLAUCUS Nelson, Bull. Torr. Club 25:377, 1898. — A glaucous-leaved form or state of Linosyris 

 visddiflora serrulata Torrey, which in turn is here considered as not separable from C. viscidiflorus Iypicus (see 

 No. 42 of this list). The peduncles are sometimes obscurely puberulent. Old specimens are less glaucous, 

 according to Nelson (Bot. Gaz. 28:376, 1899). The heads in the type material are 4-flowered, as originally 

 described, but they are often 5-flowered, as in Nelson's 5308 from Laramie, Wyoming, and in Palmer's 257 from 

 Wadsworth, Nevada, both of which are referable here. The type is Nelson 2054 from Chimney Rock, Medicine 

 Bow Mountains, Wyoming. 



17. C. HUMiLis Greene, Pittonia 3:24, 1896. — C. viscidiflorus humilis. 



18. C. LANCEOLATUS Nuttall, Trans. Am. Phil. Soc. II, 7:324, 1840.— C. viscidiflorus lanceolatus. 



19. C. LATiFOLius Rydberg, Bull. Torr. Club 33:152, 1906.— C. viscidiflorus Mifolius. 



20. C. LEUCOCLADUs Greene, Pittonia 5 : 59, 1902.— A form of C. viscidiflorus iypicus with exceptionally large 

 heads and rather narrow leaves. Said by Greene to be near elegans, but the type in his herbarium does not have 

 the green thickenings on the bracts characteristic of that subspecies. The involucres in the type specimen are 

 7 to 8 mm. long, which is exceptionally large, even for Iypicus; leaves 2 mm. wide; stems of unknown height, 

 the portion preserved being 3 dm. long, but consisting only of leafy flowering branches. Type locality, near 

 Grand Junction, Colorado. 



21. C. LiNiFOLius Greene, Pittonia 3:24, 1896.— C. viscidiflorus linifolius. 



22. C. MARIANUS Rydberg, Bull. Torr. Club 37: 131, 1910.— The type specimens at the herbarium of the New 

 York Botanical Garden appear to be identical with C. visddiflorus puherulus, except that the achenes are only 

 sparsely pubescent or nearly glabrous. The original description of the leaves and bracts applies exactly to the 

 common form of puberulus. The type locality is along the Sevier River, below Marysvale, Utah. Most of the 

 material under this name at the United States National Herbarium has strongly pubescent achenes and belongs 

 in part to C. visddiflorus stenophyllus, the remainder being chiefly C. v. elegans. 



23. C. PUBERULUS Greene, Erythea 3:93, 1895. — C. visddiflorus puberulus. 



24. C. PUMILUS Nuttall, Trans. Am. Phil. Soc. II, 7:323, 1840.— C. visddiflorus pumilus. 



25. C. PUMILUS /3 EUTHAMOiDEs Nuttall, 1. c.— A form of C. visddiflorus pumilus described as with "involu- 

 crum ovate, the scales ovate and short." The type locality was not indicated as different from that of pumilus 

 and the type specimens have not been found. Perhaps similar to this, if not identical, is a plant from the Sonora 

 Trail, east side of the Sierra Nevada, California (State Survey 1859, UC), in which the thick involucre is scarcely 

 5 mm. high and the scales very wide, the inner ones exceptionally obtuse. This may represent a subspecies 

 distinct from pumilus. 



26. C. PUMILUS var. latus Nelson, Bot. Gaz. 54:413, 1912.— An exceptionally broad leaved form of C. vis- 

 ddiflorus lanceolatus, the leaves 4 to 8 mm. wide in the types. Very distinct from pumilus, not only in the 

 much wider leaves, but also in the fine but dense pubescence of the twigs, peduncles, and foliage. The type is 

 from Ketchum, Blaine County, Idaho, Nekon and Macbride 1236 (R). 



27. C. PUMILUS var. varus Nelson, Bot. Gaz. 28:375, 1899.— C. visddiflorus stenophyllus. The types of 

 these have been closely compared and no difference found except that the type of varus is a fresher and greener 

 specimen. In the New Rocky Mountain Manual, by Coulter and Nelson, the description of varus is extended 

 to include C. elegans Greene, but this subspecies differs markedly in its densely puberulent inflorescence, green- 

 tipped bracts, and wider leaves. The type of varus is Nelson 1847 (R) from Centennial Valley, Wyoming. , 



28. C. SERRULATUs Rydberg, Bull. Torr. Club 33 : 152, 1906.— The same as No. 42 of this list. 



29. C. sTENOLEPis Rydberg, 1. c, 37: 131, 1910.— A perplexing variation apparently referable to C. visddi- 

 florus Iypicus, but differing in the narrower and very acute involucral bracts. The type specimen (Pass Creek, 

 Bridger Mountain, Montana, Engebnann, NY) has "leaves only 2 to 4 mm. wide and is described as a low shrub, 

 2 to 3 dm. high. The whole aspect of the plant, with its narrow, tmsted, incurved leaves suggests that it may 

 be the response to a cold, dry environment. There should be considered in this connection also Nelson 6S08 (as 

 to the glabrous plants, the pubescent ones being subspecies lanceolatus) from the Laramie Hills, Wyoming, and 



