SCROPHULARIACEZ 501 
one, entire or 2-lobed: ovary 2-celled or rarely 1-celled, with 
the few-many-ovuled placenta in the axis: ovules anatropous 
or amphitropous. Stylesimple, 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. 
Eee icdons 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 Verrsascum 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 lp or lobes of the corolla 
external in the bud. | | 
TRIBE 11 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: 
8 Antirrhinum Corolla merely saccate or gibbous at base. 
TRiBE urt-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. 
5 Tonella Corolla little declined, obscurely bilabiate. 
** Corolla-ttibe not gibbous above: ovules and seeds indefinitely 
numerous. | 
+ Sterile filament represented by a scale on the upper side of the 
throat of the corolla. 
6 Scrophularia 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 Pentstemon Corolla elongated-tubular: seeds angulate, not winged. 
* * * Corolla-tube not gibbous: ovules and seeds rather numerous: 
inflorescence simply spicate. 
9 Chionophila 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. 3 
