COMPOSITE FAMILY COMPOSITAE 
KEY TO GENERA 
All corollas strap shaped... ...« «s,s...» +. +seia eee } 
All corollas tubular... 00... 5. co 060000 s us eee ees an 
Both strap-shaped and tubular corollas present............ 
All or nearly all leaves basal: .. 2... vs ce oe f 
Some of the leaves on upright stems................2-00 00d 
Pappus composed of scales and bristles........ Krigia p. 386 
Pappus composed entirely of bristles........ Taraxacum p. 387 
Pappus of scales; flowers mostly blue........ Cichorium p. 385 
Pappus of bristles... .....5/s'2)s sss ..« .s/. See 5 
Pappus white. 0.5 J 5..0500 5.000.405 2a ee 7 
Pappus creamy or yellowish...... +..«+ivwsd» sab out eee 3 
Pappus like a feather 2220.0: 242 (dws ae Tragopogon p. 385 
Pappus hairlike .:s 05 00.6. i+.-0 «+00 aes Syepgmen ane ] 
Fifty or more flowers in each head.......... Sonchus p. 388 
Not more than 30 flowers in each head........ Lactuca p. 386 
WIOWMELS, VOUOW 6.0 ives eee 00> 6 Hieracium p. 392 
Flowers whitish or purplish................ Prenanthes p. 391 
Leaves and involucres very prickly............ Cirsium p. 383 
Leaves not prickly). 0220500 0... sc ow oa te ee 10 
Involucres forming burs in fruit.............. Arctium p. 383 
Involucres not forming burs. ...;....52..5.02808s00n ame 
Plants woolly... 3.65.00... ec cee ee ok eve eee en 
Plants not. woolly.¢ o0i1 c500 008 32500 i a ee 
Plants strongly odored.................. Gnaphalium p. 357 
Plants not strongly odored.............. Antennaria p. 35! 
Pappus of bristles: i000... 29005 OFS : 
Pappus lacking; heads very small.......... Artemisia p. 37 
Involucre composed of § bracts.............. Cacalia p. 38 
Involucre of more than § bracts..........«+)s¢ss1a ee eee 
Leaves opposite or whorled................ Eupatorium p. 33' 
Leaves alternate... . .. 000 cee wo nee 50 + buns een ; 
Heads arranged 10 a spike... .....+..-«s.< +0 seem Liatris p. 34 
Fleas MOC FEDIRG. . seven ec cee eee eee Vernonia p. 33 
Upper part of plant sticky or gumlike...... Grindelia p. 34 
Piant not sticky or gumlike:: ...5...55 2 0s. or eee oe ‘ 
Plants strongly odored../. 02... ...s'.. «es +a) see nn 
Plants not strongly odored.. .. 0.5.0... t's yee eee 
Leaves finely: divided \).055 08505 25 sede ee } 
Leaves: not: finely divided .)..:.: +5 +9swt> Janae Polymnia p. 35 
Disk flaweta’ vellow.::\5a7 toca ots aici Anthemis p. 3 
Disk ; Lotrers, We ite o,o)0 09d inlet x CA abies ee Achillea p. 37 
Pappus composed of bristles... .......+..4s++sse="» «sen 
Pappus not composed of bristles......... eee 
334 
