6 GENERAL KEY TO THE GAMOPETALOUS ORDERS. 



101. ACANTHACEjE. Ovary two-celled, with placentae in the axis, bearing a definite 

 number of ovules (two to eight or ten in each cell), becoming a loculicidal capsule. 

 Seeds wingless, destitute of albumen (or a thin layer in Elytraria), either globular 

 on a papilliform funicle, or flat on a retinaculum. Embryo with broad and flat 

 cotyledons. 



= = Cells of the ovary uniovulate or biovulate. 



102. SELAGINACEiE. Ovary two-celled : ovule suspended. Embryo in fleshy albu- 

 men : radicle inferior. Leaves alternate. 



103. VERBENACEjE. Ovary two-four-celled, in fruit di-tetrapyrenous, not lobed, in 

 Phryma one-celled and becoming an akene. Ovule erect from the base of each cell or 

 half-cell. Seed with little or no albumen : radicle inferior. 



104. LABIATjE. Ovary deeply four-lobed around the style, the lobes becoming dry 

 seed-like nutlets in the bottom of a gamosepalous calyx. Ovule erect. Seed with 

 little or no albumen : radicle inferior. Commonly aromatic herbs or undershrubs. 



■i- ■*- Corolla scarious and nerveless : flowers tetramerous, regular. 



105. PLANTAGINACE.E. Calyx imbricated. Corolla-lobes imbricated in the bud. 

 Stamens four or fewer. Style entire. Ovary and capsule one-two-celled : cells 

 sometimes again divided by a false septum. Seeds mostly amphitropous and peltate, 

 with straight embryo in firm fleshy albumen. Chiefly acaulescent herbs, with one- 

 many-flowered commonly spike-bearing scapes, arising from axils of the leaves. 



