; C1; 8.J COXVOLVULI. 103 



which Hetiofropium, Echium, Lithospermum, fig. 178, 

 Pulmonaria, Onosma, and perhaps Coldenia, all which 

 have a naked-mouthed, or pervious, Corolla ; with 

 Symphytiim, Lycopsis, Myosotis* Anchusa^ Borago, 

 Asperugo, Cynoglossum, and Trichodesma of Browu, 

 whose tube is closed with valves, constitute indubitable 

 examples. Tourmfortia, Ehretia, and Cordia, (the 

 latter comprehending Varronla^) are also retained 

 here ; but Mr. Brown proposes to separate Hydro- 

 phyllum, Ellisia, and Jussieu's Phacdia, as having a 

 copious cartilaginous Albumen, compound, or at least 

 deeply lobed, Leaves, and a capsular Fruit. 



The true Boragwetf are allied by their Seeds to 

 Labiatce, Ord. 39 ; but differ in their pungent or 

 warty, not hairy, pubescence ; mucilaginous, not aro- 

 matic, qualities; alternate, not opposite, Leaves; and 

 blue, rather than crimson or purple, Flowers, ex- 

 cept in the bud. Messerschmidia and Cerinthe differ 

 from the rest in having a kind of two-celled twin Cap- 

 sule, or Nut; and Cerinthe has a glaucous, smoother, 

 though warty, habit, with reddish or yellow Flowers. 

 Onosma too is always yellow-flowered. The change 

 in the Corolla of the Boraginecc in general, from 

 jbright red, to a vivid blue, as the Flower expands, 

 apparently caused by the sudden loss of some acid 

 principle, is a very curious phenomenon. 



Ord. 43. CONVOLVULI. "Calyx deeply 5-cleft, 

 often permanent. Corolla regular, with a generally 

 5-lobed limb. Stamens as many as the segments, aU 



