246 SCROPHULARIACE^. 



stigma depressed-capitate. Capsule and the cyathiferous seeds of Antirrhimcm § Pseudo- 

 rout ium. 



Tribe IV. CHELONE^. Corolla more or less bilabiate and tubular, not saccate 

 or otherwise produced at base anteriorly. Antheriferous stamens 4, and rudiment 

 of the fifth commonly present. Capsule dehiscent by valves. Inflorescence nor- 

 mally compound (at least the peduncle 2-bracteate) , and leaves opposite. (Chion- 

 ophila is exceptional and of doubtful position, having flowers simply spicate, and 

 the leaves sometimes alternate. In some species of Collinsia, the flowers are solitary 

 in the axils on a bractless peduncle or pedicel.) 



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

 few or solitary'in tlie cells: calyx deeply 5-cleft, campanulate : peduncles or pedicels 

 simple and ebracteate. 



7. COLLINSIA. Corolla declined, deeply bilabiate; its upper lip 2-cleft, with lobes more 

 or less erect and replicate ; lower larger and 3-lobed ; its lateral lobes pendulous-spreading ; 

 middle one conduplicate into a keel-shaped sac which encloses the 4 declined stamens and 

 style. Filaments long and filiform ; the lower or anterior pair inserted higher on the 

 corolla than the other : anthers round-reniform ; their two cells confluent at the apex 

 into one. Gland at base of corolla on tlie upper side represents the fiftli stamen. Style 

 filiform : stigma small, entire, or minutely '2-cleft. Capsule ovate or globose, at first sep- 

 ticidal ; the valves soon 2-cleft. Seeds amphitropous and peltate, concave ventrally. 

 Leaves undivided. 



8. TONELLA. Corolla little declined, obscurely bilabiate, and the 5 more or less unequal 

 lobes somewhat rotately spreading ; the lower not enclosing the soon ascending stamens ; 

 tube slightly gibbous posteriorly. Ovules and seeds 1 to 4 in each cell, oval. Cauline 

 leaves mainly tei'nately divided or parted. 



* * (Genuine Chelonere.) Corolla-tube not gibbous posteriorly : ovules and seeds indefi- 

 nitely numerous : calyx deeply 5-parted or of distinct sepals, imbricated : inflorescence 

 mostly thyrsoidal, /. e. tlie axillary clusters centrifugal or cymose, or when reduced to a 

 single flower the peduncle or pedicel 2-bracteate : capsule septicidal. 



-H- Sterile stamen represented by a scale on the upper side of the throat of the corolla. 



9. SCROPHULARIA. Corolla short ; the tube ventricose and globular or oblong; lobes 

 5, unequal, four of them erect and the two posterior longer; the fifth or anterior reflexed 

 or spreading. Stamens 4, declined, usually included or shorter than the corolla lobes : 

 anthers transverse and confluently 1-celled. Stigma entire or emarginate. Seeds margin- 

 less, rugose. 



H— +- Filament of the sterile stamen conspicuous and elongated: corolla from ventri- 

 cose-campanulate to elongated-tubular; the limb either obscurely or strongly bilabiate. 



10. CHELONE. Seeds surrounded by a broad membranaceous wing. Otherwise nearly 

 as Priitslpmon. Anthers long-woolly as in the first division of that genus; the wool mainly 

 confined to the inner face. 



11. PENTSTEMON. Seeds angulate, marginless. Antheriferous stamens 4, declined at 

 base, ascending above: filaments filiform : anther-cells either united or confluent at apex. 

 Style filiform : stigma small, entire. 



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

 cleft : inflorescence simply spicate : capsule at first loculicidal. 



12. CHIONOPHILA. Calyx funnelform, tiiin-membranaceous becoming scarious, merely 

 and obtusely o-lobed. Corolla tubular, with slightly dilated throat and bilabiate limb, 

 somewhat personate ; upper lip erect and slightly concave, barely 2-lobcd, the sides some- 

 what recurved ; lower with convex densely bearded base forming a palate, and 3-lobed, 

 the short lobes recurving. Stamens of Eiipcntstpmon : cells of the antliers divaricate and 

 confluent. Sterile filament small and short, or even minute, naked. Style filiform : stig- 

 ma minute, entire. Capsule oblong, enclosed in the marcescent calyx and corolla, loculi- 

 cidall}' 2-valvcd, and the valves soon septifragal and 2-partcd ; placental dissepiment 

 flat. Seeds rather large, oblong, with a very loose and arilliform cellular-reticulated 

 outer coat. 



TRfBE V. GRATIOLE.E. Corolla from bilabiate to almost regular, not saccate or 

 otherwise produced at base. Antheriferous stamens 2 or 4: no rudiments of the 

 fifth. Capsule dehiscent, many-seeded. Inflorescence simple and centripetal; the 

 pedicels solitary in the axil of bracts or leaves and ebracteolate. Leaves opposite (or 

 verticillate), or only the uppermost alternate. 



