28 ACANTHACEiE. Dianthera. 



one of them terminal, liorizontal ; the other lower down and vertical. Ovary surrounded by 

 a fleshy disk at the base. Style filiform, exserted, articulated : stigma small, emarginate. 

 Capsule obovate, compressed contrary to the dissepiment ; the base attenuated into a stipe. 

 Seeds roundish, compressed. 



In water. Niagara river, Oneida lake, Oswego river, and other places in the western parts 

 of the State. Fl. July. Fr. August. 



■ I have not been able to refer this plant to any of the genera of AcANTnACE^, as they have 

 lately been reformed by Nees ; and have therefore restored and modified the old genus 

 DiANTHEKA, to which it formerly belonged, and in which it is again placed. 



Order LXIX. SCROPHULARIACE^. R. Br. The Figwort Tribe. 



Calyx of 4 or 5 more or less united sepals, persistent. Corolla personate, 2- 

 lipped, or more or less irregular, with an imbricated geslivation. Stamens 

 usually 4 and didynamous, rarely equal ; the posterior or fifth stamen some- 

 times present, either as an abortive filament or perfect ; sometimes only 2 (the 

 three posterior being abortive or rudimentary). Ovary 2-celled ; the placentae 

 in the axis. Capsule 2-valved. Seeds numerous. Embryo straight, in the 

 axis of fleshy albumen. — Herbs, or sometimes shrubby plants. Leaves usually 

 opposite. 



CONSPECTUS OF THE TRIBES AND GENERA. 



Tribe 1. VERBASCEjE. Tube of the corolla very short or globose; the limb rotate and somewhat equally 5- 

 lobed, or 2-lip]]ed. Fertile stamens 2-5, mostly declined : anther-cells divaricate, confluent. Capsule 

 septicidal, 2-valvcd. Testa solid. 



1. Verbascdm. Corolla rotate, almost equally 5-lobed. 



2. ScROPHUi.AKiA. Corolla somewhat globose ; the limb contracted, with 2 short lips. 



Tribe 2. ANTIRRHINE^. Corolla tubular; the limb personate or ringent. Stamens 4, didynamous: anthers 

 2-celled, approxiinated by pairs. Capsule opcnijig by teeth or rarely by a lid, sometimes irregularly 

 bursting. Testa solid or arillate. 



3. LiNAniA. Corolla personate ; upper lip 2-clcft and reflexed, the lower 3-cleft ; tube inflated, with a spur at the base. 



Capsule opening by 5 teeth. 



4. CoLi.iNsiA. Corolla personate, without a spur; the middle lobe of the lower lip saccate, and embracing the stamens. 



Capsule 1 - 2-seeded. 



Tribe 3. DIGITALE/E. Corolla tubular, 2-lipped. Stamens 4, with sometimes a fifth sterile one, declined at the 

 base, and usually ascending above: anther-cells divaricate. Caps'ile septicidal ; the valves 2-cleft. 



5. Chelone. Corolla vcntricose, gibbous above. Fertile stamens 4, with a fifth short sterile filament. Seeds mem- 



branaceously margined. 



6. Pentstemon. Corolla vcntricose. The fifth or sterile filament longer than the fertile, and bearded on the upper aide. 



Seeds angular. 



