KEY TO WEEDS 

 o. Fruit a many-seeded 4-celled pod 



p. Fruit 1-seeded 



(o) Fruit inclosed in greenish, white or pink sepals, 

 nodes enlarged, stipules sheathing 

 r. Plants 1-3 feet, racemes short and thick 



s. Plants 1-1^2 feet, racemes narrow 

 (r) Sepals white or pink 



(s) Sepals greenish 



([)) Fruit inclosed in fleshy-mealy sepals, stems ridged 



(q) Fruit inclosed in dry spiny sepals 

 r. Dull green, spikes dense 



s. Deeper green, spikes slender 



(n) Flowers and fruits in the axils of the leaves 

 o. Fruit a blue-black berry 

 p. Fruit dry, not berries 



(o) Stems four-sided, leaves cordate 



(p) Stems round, leaves ovate to lanceolate 

 r. Leaves alternate, fruits surrounded with leafy bracts 

 (r) Leaves parallel-veined, petioles sheathing 



(s) Leaves net-veined, petioles not sheathing 



s. Leaves opposite 



(r) Plants smooth, transparent and watery 

 (s) Plants more or less hairy, not transparent 

 t. Plants tall, fruit 1 cm. or more 



u. Plants low, spreading, fruit less than 1 cm. 

 (t) Leaves all sessile and viscid hairy 



(u) Lower leaves petioled, slightly hairy 

 y. Perennials or biennials 



(x) Leaves densely gray-woolly, large and basal 

 (y) Leaves not woolly, mostly on the stem 

 m. Leaves linear 



n. Leaves oblong to ovate or lanceolate 



(m) Leaves alternate with sheathing stipules 

 (n) Leaves opposite without sheathing stipules 

 o. Margin of leaf entire 



(o) Fruit surrounded by large green involucre 

 (p) Fruit surrounded by close-fitting calyx 



p. Margin of leaf serrate or toothed 



(o) Flowers in spikes or racemes, leaves not stronj 

 scented 

 r. Leaves sessile, spikes dense 



Ondgra biennis: evening 

 primrose 



Polygon u m pen nsilvdn hum : 

 per sic aria 



Polygonum lapathifolium: 

 pale persicaria 



Polygonum hydropiper: 



smartweed 



Chenopodium album: goose- 

 foot 



Amardnthus retro flexus : pig- 

 weed 



Amardnthus hybridus: green 

 pigweed 



Solarium nigrum: nightshade 



Ldmium amplexicaule: hen- 

 bit 



Commelina communis : day- 

 flower 



Acalypha virginica: 3-seeded 

 mercury 



Pilea pumila: clearweed 



Silene noctiflora: night- 

 flowering catchfly 



Cerdstium vulgdtum: mouse- 

 ear chickweed 

 Stellar ia media: chickweed 



Verbdscum thdpsus: mullein 



Lindria vulgaris: butter 

 and eggs 



Rumex crispus: dock 



Allionia nyctaginea: 

 Saponaria officinalis: soap- 

 wort 



Verbena strict a: hoary ver- 

 vain 



