ANALYTICAL KEY. Xlll 



Ovary 4-lobed, forming 4 separate or separable seed- 

 like nutlets. Borraginace^:, 53 



Ovary single and entire. 

 Style 3-clef t at apex : capsule 3-celled : corolla 



convolute Polemoniace^, 51 



Styles or stigmas 2 or 1. 

 Ovules and seeds at most 4, large, with large embryo and 



little or no albumen : peduncles axillary. Convolvulaceje, 54 

 Ovules few or numerous : embryo small, in albumen. 

 Leaves all opposite or whorled and entire : capsule 



1-celled : corolla convolute. . . Gentianace^, 50 



Leaves various, mainly alternate. 



Styles 2 (or 1 and 2-cleft) : capsule 1 to 2- 



celled Hydrophyllacejs, 52 



Style 1 : stigma usually 1 : capsule or berry 



2-celled, rarely more Solanacejb, 55 



See also Limosella, in Scrophulariacejs, 56 



«- ■*- Corolla irregular : stamens (with anthers) 4 and didynamous, or 2: style 1. 



Ovary and capsule 2-celled : seeds small, mostly indefi- 

 nite Scrophulariace^, 56 



Ovary and capsule 1-celled, with many-seeded placentae 



in the axis Lentibulariace^:, 58 



Ovary 4-parted, in fruit as many seed-like nutlets. . . Labiate, 60 



Ovary undivided : fruit splitting into 2 or 4 one-seeded 



nutlets. Verbenace^e, 59 



Division III. APETALiE. Corolla (and sometimes calyx) wanting. 

 A. Flowers not in aments. 



1. Ovary and fruit superior, 1-celled and l-ovuled, or carpels distinct if more 



than one. 



Stipules sheathing the stem at the nodes. . . . Polygonace.®, 66 



Stipules not sheathing the stem or none. 

 Shrubs or trees. 

 Leaves alternate : flowers perfect : fruit a tailed akene. 



Cercocarpus, in Rosacea, 26 

 Leaves alternate : flowers unisexual ; fruit a utricle. Chenopodiace^e, 65 

 Leaves opposite. 



Fruit an akene : leaves small and narrow. Coleogyne, in Rosacea, 26 

 Fruit a simple samara : leaves pinnate. Fraxinus, in Oleace^:, 47 



Herbaceous, or sometimes woody at base. 

 Fruit a utricle : seed lenticular : embryo annular or spiral. 

 Flowers with scarious persistent sepals and bracts : no 



Stipules AjHARANTACE-ffi, 64 



