34 



Key 



Page 



(n) Stamens not conspi- 

 cuous Verbena — 177-8 



s. Stems not square, 

 (x) Petals distinct. 



(1) Fruit with a long beak Erodium — 112 



(2) Fruit without a beak Silene — 78 



(y) Petal-like sepals united at 



base. 



(m) Flowers trumpet-shaped 

 or tubular, y 2 " or more 

 long 



(1) Flowers scarlet Nyctaginia— 75 



(2) Flowers deep pink Mirabilis — 73 



(3) Flowers neither scarlet 



nor deep pink Martynia — 195 



(n) Flowers small, not tubu- 

 lar, wine-red Boerhaavia — 75 



d. Flowers blue to purple. 



m. Shrubs Salvia— 187 



n. Vines or stems prostrate Vincetoxicum — 164 



o. Plants neither shrubs nor vines, 

 (x) Stems square. 



(1) Corolla tubular, strongly 2- 

 lipped — See Key to Men- 



thaceae . . Menthaceae— 180 



(2) Corolla not strongly 2- 



lipped . . Verbena — 177-8 



(y) Stems not square. 



r. Petals distinct Erodium— 112 



s. Petals united at least at base. 



(m) Corolla saucer-shaped Gilia — 169 



(n) Corolla bell-shaped or 

 tubular. 



(1) Corolla blue, lobes equal Eustoma— 161 



(2) Corolla pale, some-what 

 2-lipped. 



(a) One stamen bearded Pentstemon— 191 



(b) None of the stamens 



bearded Martynia — 195. 



(II) Leaves mainly alternate, 

 x. Leaves with one main vein at base, 

 a. Flowers yellow or orange. 



