SCROPHULARIACE^E 501 



one, entire or 2-lobed: ovary 2-celled or rarely 1-celled, with 

 the few-many-ovuled placentae in the axis: ovules anatropous 

 or amphitropous. Style simple, with entire, 2-lobed or 2-lam- 

 ellate stigma. Fruit mostly capsular and septicidally or loculi- 

 cidally dehiscent. Seeds mostly numerous with small and 

 straight or only slightly curved embryo in fleshy albumen. 

 Cotyledons little if at all broader than the radicle. 



I Inflorescence simply centripetal. Corolla hardly if at all 

 bilabiate the two posterior lobes external in the bud. 



TRIBE i Corolla rotate, with hardly any tube. Anthers con- 

 fluently 1 celled, (^Introduced weeds). 



1 VEBBASCUM Leaves alternate : Stamens 5, all with anthers 



II Leaves mostly opposite, at least the lower ones. Inflor- 

 escence when simple centripetal, when compound the peduncles 

 cymosely few-several-flowered. Upper lip or lobes of the corolla 

 external in the bud. 



TRIBE n Corolla bilabiate and more or less tubular: the base 

 of the tube gibbous or saccate or spurred on the lower side. 



2 Linaria Corolla with a spur at the base : 



3 Antirrhinum Corolla merely saccate or gibbous at base. 



TRIBE in Corolla more or less bilabiate and tubular, not sac- 

 cate or otherwise produced at base on the lower side. Antherif- 

 erous stamens 4 and rudiment of the fifth commonly present. 



* Corolla gibbous or saccate on the upper side of the tube : ovules 

 and seeds few or solitary in the cells. 



4 Collinsia Corolla declined, deeply bilabiate. 



6 Tonella Corolla little declined, obscurely bilabiate. 



* * Corolla-tube not gibbous above : ovules and seeds indefinitely 

 numerous. 



*- Sterile filament represented by a scale on the upper side of the 

 throat of the corolla. 



ft Scrophnlaria Corolla short ; the tube ventricose and globular or oblong. 

 *- -*- Sterile filament conspicuous and elongated. 



7 Chelone Corolla elongated-tubular : seeds surrounded by a broad 



membranous wing. 



8 Fentstemon Corolla elongated-tubular : seeds angulate, not winged. 



* * * Corolla- tube not gibbous : ovules and seeds rather numerous : 

 inflorescence simply spicate. 



9 Cliionophila Corolla tubular, with slightly dilated throat : seeds with 



a loose and arilliform outer coat 



TRIBE iv Corolla from bilabiate to almost regular, not saccate 

 or otherwise produced at base. Antheriferous stamens 2 or 4 : 

 no rudiment of the fifth. 



