Key 33 



Page 



(x) Flowers composite — See Key 



Asteraceae Asteraceae — 205 



(y) Flowers simple, 

 r. Stems square. 



(1) Stems white-woolly Marrubium — 183 



(2) Stems not white- woolly, 

 (m) Leaves with stinging 



hairs Urtica — 70 



(n) Leaves without sting- 

 ing hairs Verbena — 177-8 



s. Stems not square. 



(1) Flowers in spikes or close 



racemes, 

 (m) Leaves heavily ribbed, 



all basal Plantago— 196 



(n) Leaves not heavily 



ribbed — Cynoctonum — 159 



(2) Flowers in flat-topped 



clusters Valerianella — 201 



(3) Flowers not in spikes or 

 flat-topped clusters. 



(a) Petals distinct. 



(1) Fruit with long beak Geranium— 111 



(2) Fruit not beaked Silene— 78 



(b) Petals united. 



(m) One stamen bearded Pentstemon— 191 



(n) None of the stamens 



bearded Martynia — 195 



c. Flowers pink to red. 



m. Vines or stems prostrate.... Vincetoxicum — 164 



n. Plants not vine-like, 

 r. Stems square. 



(x) Corolla tubular, strongly 2- 

 lipped — See Key to Men- 



thaceae Menthaceae — 180 



(y) Corolla not tubular and 2- 

 lipped. 



(1) Corolla with yellow center Sabbatia — 161 



(2) Corolla with purple center. Anagallis — 157 



(3) Corolla without yellow or 



purple center, 

 (m) Stamens conspicuous Erythraea — 160-1 



