ASTERACEAE 



4« 



1 [elianthus -Sunfli iwer 



heliot, ran, antho«. Bower, referring to the goldei 



1. Disk brown or purplish 



.1. Leaves opposite, thiik, lanceolate; perennial //. rigidus 



I). 1 ostly alternate, thinner, ible 



in the cultivated forms II. intuitu 



2. 1 lisk yellow 



a. Leaves l- "i,^. mostly lance-shaped 



(1) Leaves petioled; stem glaua //. .. r rat us 

 ssile 



sit-in smooth //. divaricdtus 

 (1)) Stem rough 



\. Leaves mostly entire, usually folded //. Maximilidni 



y. I ithed, flat //. giganteus 



b. i "ill 



(1) Stem smooth or soft hairy //. decapetalus 



(2) Stem rough or bristly hairy //. tuberisus 



I [elianthella — Alpine Sunflower 

 ■ A Greek- Latin hybrid, meaning little sunflov 

 . very long; heads 510 cm. wide, yellow //. quinquenirvis 



1 [eliopsis — ( )xeye 



Mir. helios, sun, opsis, look, from the yellow lays) 

 Leaves ovate ; rays pistillate, yellow //. /,': is 



Si lidago — Golden-rod 



(I. at. soiidus, whole, from its reputed healing properties) 



1. Heads in a flat-topped cluster 



a. Rays fewer than the disk flowers 



(1) Leaves ovate to oblong, rough S. rigida 



Leaves long, lanceolate, smooth S. Riddillii 



b. Kays more numerous than the disk flowers; leaves linear S. graminijolia 



2. Heads in a terminal much-branched conical cluster 



a. Stem and leaves glabrous or nearly so 



(1) Heads in a compact rounded thyrse 5. speciosa 



Meads in onesided spreading clusters 



(a) Leaves 3-nerved 



\. Tail, 1-2 m. high; along streams and in meadows S. serdtina 



y. Low, '_■ 111. high; on prairies and plains S. missouriensis 



(b) Leaves without a strong pair of lateral veins 



x. Racemes few ; heads 4 -i> mm. high S. ulmifdlia 



y. Racemes many ; heads 3-4 mm. high S. jiincca 



b. Stems anil leaves hairy 



(1) Leaves lanceolate, serrate, long-pointed 5. canadensis 



oblanceolate to broadly spatulate 



(a) Leaves green, rough on both sides S. rddula 



(b) Leaves gray or ashy 



x. Leaves faintly 3-nerved S. nemordlis 



y. Leaves strongly 3-nerved S. mollis 



3. Heads mostly in axillary clusters 



a. Rays white; leaves hairy, blunt S. bicdlor 



b. Rays yellow ; leaves smooth, long-pointed 5. c 



Clir -Chryso] 



tGr. chrysos, gold, opsis, likeness) 

 Leaves hairy, oblong ; heads yellow C. villdsa 



