28 



ACANTHACE^E. 



DlANTHEItA. 



one of them terminal, horizontal ; 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 Acanthace^e, as they have 

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

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



Order LXIX. SCROPHULARIACEtE. 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 aestivation. 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 OP THE TRIBES AND GENERA. 



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

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

 septicidal, 2-valved. Testa solid. 



1. Verbascum. Corolla rotate, almost equally 5dobed. 



2. Scrofhularia. Corolla somewhat globose ; the limb contacted, with 2 short lips. 



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

 2-celled, approximated by pairs. Capsule opening by teeth or rarely by a lid, sometimes irregularly 

 bursting. Testa solid or arillate. 



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



Capsule opening by 5 teeth. 



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



Capsule 1 - 2-seeded, 



Tribe 3. DIGITALEyE. Corolla tubular, 2-Iipped. 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 ventricose, gibbous above. Fertile stamens 4, with a fifth short sterile filament. Seeds mem- 



branaceously margined. 



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



Seeds angular. 



