104 riiirn-sih/ of CaUfoviiid I'lihllcdtioiis in BiAinnj I V<'i.. 7 



Inner bracts of iiivnliicrc ])l;iiiily tomciitosc oi' if iiciirly ^lahioiis \\\v bracts 

 then acute. 

 Corolla-lolics liniccolnti'. 1 to 12 iiini. loiiy : iiivdiucral bracts acute (at least 



in part) !• iKiuscnsus s. str. 



Corolla hilx's sliort-ovate, less than 1 mm. lon<i: bracts all very obtuse. 



2. Iiololeucus 

 Inner bracts smooth ami {rlabrous or marly so, very obtuse .....3. lot isqiui mens 

 Tomentuni close, compact, smooth, and usually >irayish on twig-s and leaves: 

 corolla-tube jjlabrous or puberulent. not arachnoid-pube.scent. 



Leaves A to (5 nun. wide: bracts very obtuse 4. salicifolius 



Leaves less than :> mm. wide: bracts various but mostly acute. 



Bracts abruptly acute. Far western fi. nrridnifuli.s 



Bracts "gradually acute or somewhat obtuse. 

 Involucre 7 to 9 or rarely 10 mm. hi<);h. 



Shrubs normally .") to 20 dm. hiyh: corcdla 8 to 10 mm. loun or rarely 



only 7 mm. in {itiapJuiUidcs {latisquainrus of Arizona and New 



Mexico, with broad and very obtuse and smooth inner bracts might 



be sought here ). 



Leaves of flowering twigs 1 to '.', cm. long, not numerous: herbage 



usually fragrant ='>. giuiphaUxhs 



Leaves of flowering twigs mostly over 3 cm. long, often crowded: 



herbage not fragrant 7. specios'm 



Shiubs only 2 to H dm. high: corolla H to 8 mm. long (very rarely 

 9 mm.). 

 Leaves erect or ascending: bracts all tonientulose or ciliate..8. frigidus 

 Leaves spreading or recurved : oidy the outer bracts tomentulose. 



9. plattensis 



Involucre 11 to 12 mm. or rarely only 10 mm. high 10. bernardinu/i 



Akenes glabrous. 



Bracts of the involucie acuminate 11. Bigelovii 



Bracts of the invohuic obtuse 12. glareosus 



Series B. The Green Forms 



Involucres perfectly glabrous although .sometimes viscidulous or glaudular: 

 foliage mostly greenish, the tomentum rather s])arse or wanting on mature leaves. 



Akenes glabrous 1 3. Irinsperm us 



Akenes densely strigo.se. 



Leaves linear, mostly more than 1 mm. wide,-"! mostly 3 to ."-nerved e.xcept in 

 bfnuirdinu,s. 

 Involucre 6 to 8 mm. long: corolla (i to 9 mm. long; lobes 1 mm. or less 



long 14. graveolenft 



Tiivoluric 9 mm. or nnire long: coiolla 9 to 10 mm. long; hdies 1 mm. or more 

 long. Western foi'ms. 

 Heads 8 to 10-tlowercd : leaves flat or twisted, 2 to •") nnii. wide. 



15. calif ornicus 

 Hea<ls .j-flowered (rarely 6-flowered) : leaves often conduplicate, 1 to 2 mm. 



wide 10. beniardinus 



Leaves linear-filiform or very narrowly linear, mostly 1 mm. or less wide (except 

 in occidentalifi) , 1 -nerved. 



'■'■ Care must be exercised in making this measurement since the leaves are often 

 longitudinally folded. The figures given are for the total width of the flat leaf. 



