WHITE OR WHITISH FLOWERS 
Horse-weed {Erigeron canadensis) . Composite family. 
Summer and autumn. 
An upstanding weed, bearing flower-heads in panicle. Ray- 
flowers pistillate, disk-flowers perfect, with four-toothed tubu- 
lar corolla. Leaves narrow, crowded. 
GROUP XX 
Leaves alternate, simple. Flowers not in raceme, spike, or 
head. Herbs. Flowers not composite. 
Spurge {Euphorbia corollata). Spurge family. April 
to October. 
A perennial with maximum height of three feet. Flowers 
in umbel, apparently of five petals, really with white involucre 
subtending either staminate or pistillate tiny florets (monoe- 
cious). If staminate the florets thus subtended are numerous; 
if pistillate, there is only one, soon pushing up beyond the invo- 
lucre on a long stalk. Leaves egg-shaped to linear. Rich soil, 
Ontario, West and South. Euphorbus, physician to Juba, the 
Numidian king. 
SPURGE 
\Euphorhia coix^Ihta) 
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