CXLIX. HTDEOLBAC^ai. 



561 



Phacelia, Flower- bud (mag.)> 



P/iacelia. Diagram, 



LlhHa. 

 Ellma. Cylindrical 



Seed cut vertically embryo 

 (mag.). (mag.). 



alternate, the lower sometimes opposite, exstipulate. I^lowers 5, regular, in 

 spikes or scorpioid racemes, very rarely solitary on axillary peduncles. Caltx 

 5-partite, persistent, aestivation imbricate. Cokolla monopetalous, inserted outside 

 a hypogynous disk, campanulate or sub-rotate, very rarely infundibuliform, tube 

 often furnished with scales within alternate with the stamens, limb 5-fid, aestivation 

 imbricate. Stamens 5, inserted at the bottom of the corolla-tube, and alternate 

 with its lobes ; filaments with various basal appendages ; anthers introrse, 2-celled, 

 dorsifixed, versatile, dehiscence longitudinal. Ovabt 1- or incompletely 2-celled ; 

 placentas 2, linear or dilated, adnata by the base and apex to the ovary, but the 

 dorsal face often free ; style terminal, 2-fid at the top, lobes terminated by a papillose 

 stigma ; ovules 2 or more, attached by their ventral face, semi-anatropous. Capsule 

 membranous or almost fleshy, 2-valved, placentas 'free or on the middle of the valves. 

 Seeds angular or sub-globose. Embbto straight, in a copious cartilaginous albumen, 

 axUe or excentric ; radicle distant from the hilum, vague, or rarely superior. 



' Hydi'ophyllum. 

 ' Phacelia. 



PEINCIPAL GENERA. 



* Nemophila. EllLsia. 



' Cosmanthus. * Whitlavia. 



* Eiitoca. 



Hydrophyllece are near PokmoniacecB (see this family). They also approach Sydrokacece, which only 

 differ in the anatropous ovules and distinct styles. They were long confounded with Borraginete, hut 

 their only resemblance is in the scorpioid inflorescence. 



Hydrophylka abound in the temperate regions of North America ; they are rare in extra-tropical 

 South America, and still rarer in the tropics. One species only, H. cnnadense, is used in medicine, being 

 considered in America a specific for snake-bites. 



CXLIX. HYDROLEACE^. 



(Convolvuloeum: genera, jMssieM.— Htdeoleace^, Br.) 



CoTiOhhA monopetalous, hypogynous, isostemonous, wstwation imbricate. Stamens 

 inserted on the corolla-tube. Ovabt more or less completely 2-celled ; ovules anatropous ; 

 STYLES 2, distinct. Capsule loculicidal or septifragal. Embbto albuminous. 



Annual herbaceous or sub- woody plants with watery juice ; stem and branches 







