502 SCROPHULARIACEJE 



* Calyx prismatic and barely 5- toothed, or rarely campanulate and 

 hardly 5-cleft: corolla more or less bilabiate: stamens four. 



10 Diplacns Shrubby perennials : capsule firm-coriaceous, narrow and 

 closely invested by the calyx, tardily dehiscent down the upper suture. 



11 En nan us Low annuals : capsule from almost bony and indehiscent to 

 membranaceous. 



12 Mimulus Annual or perennial herbs, capsule membranceous tardily 

 separating from the central placentiferous column. 



* * Calyx 5-parted or deeply 4-5-lobed : antheriferous stamens only 

 2, the posterior pair, the anterior pair sterile rudiments or wanting. 



13 Gratiola Sterile filaments none, or short and entire, 



14 Ilysanthes Sterile filaments present, slender and forked. 



* * * Calyx and corolla both 5 lobed and nearly regular : antherif- 

 erous stamens 4, nearly equal. 



15 Limosella Small plants with the flowers on scapes. 



Ill Leaves various. Lower lip or lateral lobes of the co- 

 rolla external in the bud. 



Tribe v Corolla usually little if at all bilabiate, the lobes all 

 plain, the lateral or one of them external in the bud. 



* Stamens 2, distinct, exserted ; filaments straight, inserted at or 

 below the sinuses between the two lateral and the posterior lobe of 

 the corolla. 



16 Synthyris Corolla from oblong to short-campanulate 



17 Veronica Corolla from rotate with very short tube to salverform, 



* * Stamens 4, distinct, not exserted, inserted on the upper side of 

 the tube of the corolla 



18 Digitalis Corolla tubular-funnelform, somewhat irregular. 



Tribe vi Corolla manifestly bilabiate, the upper lip erect and 

 concave or galeate, entire or emarginate, rarely 2-cleft t the lower 

 3-cleft, exterior in the bud. 



* Ovules and usually the seeds numerous. 



•*- Anther-cells unequal or dissimilar, the outer one affixed by its 

 middle, the other pendulous from its upper end, mostly smaller, some- 

 times sterile. 



19 Castilleia Upper lip of the corolla much longer than the very short 

 and 3-toothed lower one. 



20 Orthocarpus Upper lip of the corolla scarcely longer and usually 

 narrower than the inflated 1-3-saccate lower one. 



21 Adenostegia Upper lip of the corolla not longer nor much if any 

 narrower than the 3-crenulate or entire lower one. 



*• +- Anther-cells equal, parallel and alike in all 4 stamens. 



22 Pedicnlaris Calyx split anteriorly, not inflated in fruit. 



23 Rhinanthds Calyx 4-toothed, inflated in fruit. 



* * Ovules only two in each celj, one sessile and ascending, the 

 other laterally attached. 



