33— Teasel Family, flowers in head, stamens distinct. Teasel 
(Dipsacus sylvestris ) Eu. 
34— Composite Family, flowers in close heads, anthers usually 
united. Fireweed (Erechtites hieracifolia) Am. ; Cocklebur ( Xa n - 
thium commune) Am.; Jerusalem Artichoke ( Helianthus tj/berosns ) 
Am.; Great Ragweed (Ambrosia trifida ) Am., Common Rag-weed 
(A. artemisiifolia ) Am.; Yellow-weed (Galinsoga parviflora ) 
Am.; Beggar’s Ticks ( Bidens ) Am.; Heath Aster (Aster ericoides) 
Am.; Goldenrod (Solidago sps.) Am.; Daisy Fleabane (Erigeron 
ramosus) Am., Horseweed (E. canadensis) Am.; Yarrow (Achillea 
millefolium) Am.; Tansy (Tanacetum vulgar e) Eu.; Mayweed 
(Anthemis Cotula) Eu.; Daisy (Chrysanthemum Leucanthemnm) 
Eu.; Canada Thistle (Circium arvense) Eu.; Burdock (Arctium 
minus) Eu. 
35— Chicory Family, milky juice, flowers strap-shaped. Dan- 
delion (Taraxacum officinale) Eu.; Red-seeded Dandelion (T. 
e rythrospermum) Eu.; Sow Thistle (Sonchns arvensis) Eu.; Wild 
Lettuce (Lactuca scariola) Eu. and Am.; Chicory ( Cichorium 
fntybus) Eu.; Goat’s Beard (Tragopogon p>atensis) Eu. 
MONOCOTYLEDONS 
36— Spiderwort Family, jointed stems, leaves sheathed at 
base. Day Flower (Commelina communis) Asia. 
37 — Rush Family, grass-like herbs, 3 sepals, 3 similar petals. 
Rush (Juncus tenuis) Eu. 
38 — Grass Family, stem hollow; 2-ranked leaves, consist- 
ing of sheath and blade. Sandbur (Cenchrus tribuloides) Eu.; 
Crab Grass (Digitaria sauguinalis) Eu.; Barnyard Grass (Echiu- 
ochloa Crus-gal/i) Eu.; Pigeon Grass (Sefaria glanca and 
viridis) Eu.; Timothy (Phleum prate use) Eu.; Red Top ( Agrostis 
alba) Eu.; Oats (Avena saliva) Eu.; Orchard Grass (Dacty/is 
glomerata) Eu.; Panicum (several sp.); Snake Grass (Ei agrostis 
megastachya) Eu.; Quack Grass (Agropyron repens) Eu. 
A. Guxdersex. 
