602 



CLXVI. BIGNOlSriACE^. 



Bignonia Calalpa, 

 Seed (mag.). 



equalling its segments [Incarvillea) . Corolla monopetalous, hypogynous, deciduous ; 

 tube sliort ; throat dilated ; limb usually of 5 segments, bilabiate, rarely sub-regular 

 [Zeyhera), aestivation usually imbiioite. Stamens 5, inserted on the corolla-tube, 

 very rarely all fertile (Calosanthes) and sub-equal, generally 4, didynamous, the fifth 

 with no anther or absent, sometimes the 2 posterior only fertile {Catalpa) ; anthers 

 introrse, 2-celled, cells parallel and contiguous, sometimes united at the top only, 

 and diverging, dehiscence longitudinal. Disk glandular, girding the base of 

 the ovary. Ovaet superior; cells 2, antero-posterior, sometimes 1-celled {Eccremocar- 

 pus) ; style simple, filiform ; stigma 2-lamellate or -fid ; ovules more or less numerous, 

 usually horizontal, anatropous, inserted in vertical lines along the edges of the 

 septum in the 2-celled ovaries, or parietal in the 1-celled. Capsule ovoid or 

 siliquiform or compressed, 1-2-celled, sometimes pseudo-4-celIed {Tourretia), generally 

 2-valved, rarely opening by a posterior longitudinal slit {Incarvillea, Amphicome) ; 

 valves parallel or perpendicular to the septum, sometimes leaving the seminiferous 

 septum free, sometimes septiferous or placentiferous. Seeds generally transverse, 

 imbricate, 1- or many-seriate, margin winged, wing sometimes fimbriate {Amphi- 

 come, Catalpa), very rarely apterous {Arcjylea). Embryo straight, exalbuminoiis ; 

 radicle near the hilum, usually centrifugal, with the raphe next the septum ; some- 

 times centripetal, the seed being perpendicular to the septum (JacarawcZa), sometimes 

 superior from the seed becoming pendulous during development {Incarvillea, Amphi- 

 come) ; cotyledons plane, foliaceous, reniform or bilobed. 



TRiBiB I. EUBIGNONIE^. 



Septum parallel to the valves ; dehiscence marginal, that is, taking place along 

 the edges of the septum. 



PEINCIPAL GENEEA. 

 •Bignonia. Pachyptera. Fredericia. Calosanthes. 



Arrabideea. * Lundia. Cuspidaria. Anemopaegma. 



Pitliecoctenium. Adenocalymna. 



