C1RSIUM 



CREPIS 



CIRSIUM Adans. (con.) 



C. CENTAUREAE (Rydb.) K. Schum. 

 Carduus americanus (A. Gray) 



Greene, not Rydb. 

 C. c. Rydb. 

 Cirsium a. Daniels, not 



K. Schum. 

 C. remotifolium (Hook.) DC. 



ssp. c . Petrak 

 C. CLAVATUM (M. ETjones) Petrak 

 Cnicus c. M. E. Jones 



C. 

 C. 



DAVISII Cronq. 



DOUGLASII DC. var. CANESCENS 

 (Petrak) J. T. Howell 

 C. breweri (A. Gray) Jeps. 

 C. b. var. c. Petrak 

 EATONI (A . Gray) Robins . 



Cnicus e. A. Gray 

 FLODMANII (Rydb.) Arthur 

 Carduus f. Rydb. 

 Cirsium canescens of western 



authors, not Nutt. 

 FOLIOSUM (Hook.) DC. 



Carduus acaulescens Rydb. 

 C. americanus (A. Gray) 



Rydb., not Greene 

 C. coloradensis Rydb. 

 C. drummondii (Torr. & Gray) 



Rydb. 

 C. folio sus Hook. 

 C. laccerus Rydb. 

 C. longissimus Heller 

 C. oblanceolatum Rydb. 

 C. olivescens Rydb. 

 C. scariosus (Nutt.) Heller 

 Cirsium a. (Rydb.) K. Schum. 

 C. a. (ATGray) K. Schum., 



not Daniels 

 C. c . Cockerell 

 C. c. ssp. a. (A. Gray) 



Petrak 



c. ssp. 1. (Heller) Petrak 



d. TorrT & Gray 

 d. var. a. (A. Gray) Macbr. 

 f. (RydbT) Petrak 



Elk T. 



C. ROTHROCKII (A. Gray) Petrak 



Cnicus diffusus (Eastw.) Eastw. 



C. r. A. Gray 



Cirsium d. Rydb. 

 C. RYDBERGII Petrak 



C. lactycinum Rydb. 

 C. SCOPULORUM (Greene) Cockerell 



Carduus s. Green 

 C. SUBNIVEUM - Rydb. 

 C. TRACYI (Rydb.) Petrak 



Carduus acuatus Osterh. 



C. floccosus Rydb. 



Cirsium a. Rydb. 



C. _f. Rydb. 



C. UNDULATUM (Nutt.) Spreng. Wavyleaf T. 



Carduus u. Nutt. 

 Cirsium engelmannii Rydb. 

 C. megacephalum (A. Gray) 

 Cockerell 

 C. UTAHENSE Petrak 



C. humboldtense Rydb. 

 C. nevadense (Greene) 



Petrak, not Willk. 

 C. wallowense Peck 

 C . VULGARE (Savi) Tenore as to 

 author, not Airy -Shaw 

 Carduus lanceolatus L. 

 Cirsium 1. Scop., not Hill 



C. 



c. 

 c. 

 c. 

 c. 



CNICUS L. (308) 



C. BENEDICTUS L. 



CONYZA Less. (325) 



C. CANADENSIS (L.) Cronq. 

 Erigeron c. L. 

 E. c. var. glabratus A. Gray 

 C. c. var. g. Cronq. 

 Leptilon c. Britton 



COREOPSIS L. 



C. TINCTORIA Nutt. 



Calliopsis t. DC. 



BLESSED 



THISTLE 

 B. 



TICKSEED 

 Plains T. 



oblanceolatum K. Schum. 



C. o. 

 C. s. 



(Rydb.) Petrak 

 Nutt. 



HALLI (A. Gray) M. E. Jones, 

 according to J. T. Howell 

 in (1) this species does 

 not occur in our area; 

 however, it is not known 

 at this time what Blake 

 (in Tidestrom) had in 

 mind when he noted this 

 species for the Inter - 

 mountain Region 

 INAMOENSUS Greene 

 MOHAVENSE (Greene) Petrak 



Carduus m. Greene 

 NEOMEXICANUM A. Gray 

 C. arcuum A. Nels. 



E. Jones) Petrak 

 Jones 



NIDULUM (M 

 Cnicus n. M. E 



C. OCHROCENTRUM A. Gray 

 C. PARRYI (A. Gray) Petrak 



Carduus p. A. Gray 

 C. PROTEANUM J. T. Howell (1) 



Carduus venustus Greene, not 

 Cirsium v. Porta 

 C. PULCHELLUM (Greene) _ Woot. & Standi. 



Carduus p. Greene 



CREPIS L. (326, 327) HAWK'S BEARD 



Babcock & Stebbins have recog- 

 nized numbrous 

 apomictic populations, 

 but because these are 

 not considered as 

 taxonomical units they 

 are not treated here 

 C. ACUMINATA Nutt. ssp. 



ACUMINATA Tapertip H. 



C. angustata Rydb. 

 C. sessilifolia ("seselifolia") 

 Rydb. 



C. ACUMINATA Nutt. ssp. PLURI- 



FLORA Babcock & Stebbins 

 C. ATRABARBA Heller ssp. ATRABARBA 

 C. exilis Osterh. 

 C. gracilis (D. C. Eaton) Rydb., 

 not Hook. f. & Thomps. 

 C. ATRABARBA Heller ssp. ORIGINALIS 

 (Babcock & Stebbins) Bab- 

 cock & Stebbins 

 C. exilis Osterh. ssp. o. 



Babcock & Stebbins 

 C. BAKERI Greene ssp. BAKERI 

 C. BAKERI Green ssp. CUCICKH 



(Eastw.) Babcock & Stebbins 

 C. c. Eastw. 



110 



