130 Rydberg : Rocky Mountain flora 



Artemisia pudica sp. nov. 



Perennial with a horizontal rootstock ; stem 4-6 dm. high, 

 simple up to the inflorescence, white- floccose ; leaves linear or 

 narrowly linear-lanceolate, 6-10 cm. long, 6-8 mm. wide, entire, 

 white-floccose on both sides ; inflorescence a narrow panicle, the 

 branches long and nearly erect, racemiform ; heads nodding 

 on short peduncles, campanulate, about 5 mm. high and 4 mm. 

 broad ; bracts ovate, densely tomentose, with a darker midrib and 

 slightly scarious margin ; flowers about 20, heterogamous, yellow ; 

 receptacle and achenes glabrous. 



This species is related to A. gnaplalodes, but is characterized 

 by the racemiform branches of the inflorescence with peduncled, 

 nodding heads. It grows at an altitude of about 2300 m. 



Colorado: Gunnison, 1901, Baker 373. 



Pyrrocoma lagopus sp. nov. 



Perennial with a taproot; stems decumbent, 1-2 dm. long, 

 more or less villous, especially at the base and the nodes ; basal 

 leaves petioled, 6-10 cm. long ; blades lanceolate or linear-lanceo- 

 late, firm, distantly serrate with almost spinulose teeth ; stem- 

 leaves narrowly linear-lanceolate, sessile, with partly clasping 

 bases ; inflorescence racemiform ; involucre 8-9 mm. high, more 

 or less villous, especially at the base ; bracts imbricated in about 3 

 series, oblong, acute, green on the back, yellowish on the sides 

 and base; disk about 12 cm. wide; rays about 8 mm. long and 

 over 1 mm. wide ; achenes hirsute-strigose. 



This species is nearest related to P. Vaseyi, but differs in the 

 villous stem and involucre. In habit it also reminds one of P. 

 uniflora and P. inuloides, but in these species the bracts are nearly 

 in a single equal series. P. lagopus grows on dry plains and in 

 saline flats. 



Wyoming: Hams Fork and La Barge, 1900, C. C. Curtis 



(type). 



Colorado : North Park, 1899 (collector not given, but plants 

 distributed from Herb. State Agr. Coll., under no. 3232). 



Tetradymia linearis sp. nov. 



A low, unarmed shrub ; bark of the older stems shining and 

 flaky, that of the young branches more or less white tomentu- 

 lose ; leaves linear, white-tomentose, somewhat keeled, more or 

 less arcuate-squarrose and pungent-pointed ; bracts of the invo- 



