398 MANUAL OF BOTANY 



trative Genera : — Pedalium, Linn. ; Sesamiim, Linn. There 

 are about 25 species. 



Properties and Uses. — Chiefly remarkable for their oily 

 seeds. 



Order 207. Acanthace.e, the Acanthus Order. — C har a c t e r. 

 Herbs or shrubs. Leaves opposite or whorled, simple, exstipu- 

 late. Flowers irregular, bracteate. Calyx 4 — 5-partite, or 

 consisting of 4 — 5 sepals, persistent, much imbricate ; sometimes 

 obsolete. Corolla more or less 2-lipped. Stamens 2 or 4, in 

 the latter case didynamous. Ovary seated on a disc, 2-celled ; 

 placentas parietal, although extended to the axis ; style 1. 

 Fruit caj)sular, 2-celled, with a variable number of seeds in 

 each cell. Seeds hanging by hard cup-shaped or hooked pro- 

 jections of the placenta, without wings ; albumen none ; 

 cotyledons large and fleshy ; radicle inferior. 



Distribution and Numbers. — Chiefly tropical. Illustrative 

 Genera: — Acanthus, Tour^i.; Justicia, 2fees. There are nearly 

 1,500 species. 



Projjerties and U'ses.— Generally unimportant ; but several 

 species are mucilaginous and bitter. 



Cohort 4. — Lamiales. 



Order 208. Selaginace^, the Selago Order. — C h a r a c t e r. 

 Herbs or shrubs, with alternate exstipulate leaves. Flowers 

 irregular, unsynnnetrical, sessile, bracteate. Calyx persistent, 

 usually gamosejoalotis with a definite number of divisions, or 

 rarely consisting of two distinct sepals. Corolla tubular, 5- 

 partite. Stainens 4, didynamous, or rarel}^ 2 ; anthers 1-celled. 

 Ovary superior; style 1, filiform; ovule solitary, pendulous. 

 Fruit 2-celled, with 1 pendulous seed in each cell. Seeds with 

 a little fleshy albumen ; embryo with a superior radicle. In 

 Globularia there is but one carpel. 



Distribution and Numbers. — Chiefly natives of the Cape of 

 Good Hope. The species of Globularia are, however, European 

 plants. Illustrative Genera : — Selago, Linn. ; Globularia, Linn. 

 There are about 120 species. " 



Properties and Uses. — Of little importance. 



Order 209. Verbenace^, the Vervain Order. — 'C h a r a c t e r. — 

 Herbs, shruhs, or trees. Leaves opposite or alternate, exsti- 

 pulate. Calyx inferior, persistent, tubular. Corolla irregular, 

 usually more or less 2-lipped. Stamens 4, usually didynamous, 

 or rarely equal ; or sometimes there are but 2 stamens ; anthers 



