574 THE BORAGE FAMILY. 



Tube of the corolla open, without any scales or valves 

 at its orifice. 

 Stamens protruding beyond the corolla. 



Corolla oblique, and more or less irregular, with 



erect or scarcely spreading lobes . . . . 1. Echium. 

 Corolla regular, with a straight tube and spread- 

 ing limb 3. Mertensia. 



Stamens included in the tube of the corolla. 



Calyx tubular, the lobes not reaching to the 



middle 2. Lungwort. 



Calyx divided to the base. Nuts very hard . . 4. Litiiosperm. 

 Tube or centre of the corolla more or less closed at its 

 orifice by scales or valves, or stamens. 



Corolla tubular, with 5 small teeth 8. Come re y. 



Corolla rotate, the anthers erect, forming a cone in 



the centre 9. Borage. 



Corolla (small) with a slightly bent tube, and rather 



oblique spreading limb 7. Bugloss. 



Corolla with a straight tube, and regular, spreading 

 limb. 

 Calyx broad and somewhat flattened, enlarged 

 after flowering, with 5 small teeth between the 



large ones 10. Asperugo. 



Calyx regularly 5-cleft. 



Nuts depressed, ovate or round, muricated and 



burr-like 11. Hottkd's-Tongtte. 



Nuts ovoid, erect, smooth or wrinkled. 



Nuts wrinkled. Spikes with a bract under 



each flower 6. Alkanet. 



Nuts smooth and shining. Racemes without 



bracts. Flowers usually small . . . . 5. Myosote. 



Among exotic genera, 'EcJiinospermum Lappula, a south European 

 annual, which has all the appearance and the small flowers of a Myo- 

 sote, but with triangular, very rough nuts, has been occasionally found 

 in isolated localities in England, when accidentally introduced with 

 Continental weeds. The well-known sweet Heliotrope of our gardens be- 

 longs to a large exotic genus, truly JBoragineous, though somewhat 

 anomalous in the closer union of the nuts. The Nemophilas and Eu~ 

 tocas of our flower-gardens belong to the small allied Hydropliyllum 

 family, which has the inflorescence and flowers of the Borage family, 

 but the fruit is a capsule, and the leaves often divided. 



I. ECHIUM. ECHIUM. 



Coarse biennials, or, in exotic species, half-shrubby perennials, with 

 blue or purple flowers. Calyx deeply divided. Corolla with a broad, 





