ASTERACEAE 43 



Achillea — yarrow , Milfoil 

 mod for a 1 b 

 1. Heads while 



a. lira. N tingle; leaves finely dissected A. millefolium 



b. Heads double; leaves simple A. pidrmica 



.' lie. uls yellow .'/. 1 upa/dnum 



k hrysanthemum — Chrysanthemum, Daisy 



' (Gr. chrysot, gold, anthemon, (lower) 



1. Heads large, few or solitary 



a. 1 1 f.i. Is wiih a single row of white rays 



( 1 > Leaves spatulate 



(a) Weed with narrow, deeply CUt leaves C. leucdnthemum 



(b) Cultivated plant with thick crenate leaves C. lali/diium 



s lance-ovate, toothed; cultivated C. uliginSsvm 



b. Heads variously colored, usually with many rows of rays 



(1) The various showy "chrysanthemums'' are hybrids of C. indicum 



and C. morifolium 



(2) Heads rose or pink, single garden form C. roscum 



2. Heads small, numerous, often double; leaves deeply cut pinnatifid C. par illinium: feverfew 



Matricaria — Chamomile 



(From its use in medicine; cfr. Lat. matrix) 

 Annual, with smooth aromatic deeply cut leaves and small white heads, single 



or double M. chamomilla 



Boltonia — Boltonia 



(Named for Bolton, an English botanist of the 18th century) 

 Leaves entire; rays white to purplish B. glastifdlia 



Tagetes — Mangold 



(Of doubtful meaning) 

 Leaves pinnate; head single or double; rays yellow or orange T. crccta 



Grindelia — ( Irindelia 



(Named for Qrindel, a Russian botanist) 

 Leaves simple, toothed ; heads yellow, sticky G . squarrosa 



I [elenium — Oxeye, Sneezeweed 



(Gr. helenion, name of a plant) 



1. Stems winged; heads 2-4 cm. wide //. autumndle 



2. Stems not winged; heads 6-8 'era. wide //. Hoopisii 



Gaillardia — Gaillardia 



1. Named for the botanist, Gaillard) 



1. Annual; rays brown-purple, yellow at tip G. pulchilla 



2. Ferennial ; rays yellow, or brown-purple at base G. arisldta 



Calendula— Marigold 



(Lat. kalendae, months, referring to its persistent blooming) 

 Leaves oblong, sessile ; heads single or double C. officinalis 



Taraxacum — Dandelion 



(Gr. tarasso, to disturb^ 

 Leaves lobed or dissected ; heads yellow T. taraxacum 



Dysodia— Dysodia 



(Gr. dysodes, ill-smelling, rendering to the strong-scented glands) 

 Leaves deeply pinnatifid ; heads small, yellow D. papposa 



Tragopogon — Salsify. Oyster plant, Goatsbeard 



(Gr. tragos. goat, pogan. bea,rd, referring to the pappus) 



1. Heads yellow; bracts not longer than the rays T. praicnsii 



2. Heads purple ; bracts much longer than rays T. porri/dlius 



