II.] KEY TO NATURAL ORDERS. 139 



BoRAGiNACE^ (p. 248). — Herbs, shrubs, or rarely trees, 

 with aUernate simple, often roughly hairy, exstipulate leaves, 

 and cymose, usually unilateral, inflorescence. Flowers re- 

 gular. Stamens as many as corolla-lobes, and alternate with 

 them. Ovary four- (or two-) lobed, with one ovule in each 

 lobe. Style one, sometimes forked above. 



SoLANACE/E (p. 249). — Hcrbs, shrubs, or sometimes trees, 

 with alternate exstipulate leaves, and often extra-axillary 

 inflorescence. Flowers regular. Stamens as many as, and 

 alternate with, corolla-lobes (anthers opening in terminal 

 pores in Solanuiii). Ovary two-celled, with indeflnite 

 ovules. Seeds albuminous ; embryo rarely straight. 



ScROPHULARiACEiE (p. 252). — Usually herbs with alternate 

 or opposite exstipulate leaves. Flowers irregular. Stamens 

 fewer than corolla-lobes. Ovary two-celled, with indefinite 

 ovules. Seeds albuminous ; embryo usually straight. 



Lentibularie^ (p. 254). — Herbs growing in water or in 

 damp places; the aquatic species usually with dissected 

 leaves bearing minute air-vesicles. Flowers two-lipped. 

 Stamens two. Ovary one-celled, with a free central placenta 

 and indefinite ovules. 



AcANTHACEiE (p. 255). — Hcrbs or shrubs (in Thimbergia 

 usually twining) with opposite simple exstipulate leaves. 

 Flowers irregular, often with conspicuous bracts. Stamens 

 fewer than corolla-lobes. Ovary two-celled, with two or more 

 ovules in each cell. Fruit a two-valved capsule, with the 

 seeds supported on horny hooks or cushions of the placenta. 



Labiatte (p. 257). — Herbs or shrubs, usually aromatic, 

 with opposite leaves and irregular flowers. Stamens fewer 

 than corolla-lobes. Ovary four-lobed, four-celled, with one 

 ovule in each cell. Style one, gynobasic. 



VERBENACE.E (p. 259). — Trccs, shrubs, or herbs with 

 ofjposite leaves and irregular flowers. Flowers fewer than 



