.uLLiNsoMA. DIANDRIA. MONOGYNIA. 29 



lower lobe divided into many capillary segments. 

 Seeds 4; 3 of them generally abortive. Gen. pi 51. 

 Nutt. Gen, I. p. 18. Juss. p. 112. Roem, ^ 

 Schiilt. Gen. 97. Lam. Ill.^U XXI. Nat. Ord. 

 jLABiATiE Jtiss, Knot-root. Horse-weed^ 



C. canadensis L. : leaves broad-cordate, ovate, glabrous; 



teeth of the calyx short, subulate ; panicle terminal, compound . 



Willd. Sped. p. 152. excl. syn. Walt. Mich. FL\. 



p. 17. Pursh FlA.^.'iQ. E I Ho 1 1 Sk.l. i). 34. Big. 



Bost. p. 8. CoLLiKSONiA C I d. Novth. No« 8. L i n. hort. 



C I if. t. 5. 



lioot perennial. Sie7n 2—3 feet high, a little branched, obtusely 

 quadrangular, smooth. Leaves opposite, 3 — 5 inches long, 

 2 — 3 bpoad, acuminate, serrate ; the lower ones on long foot- 

 stalks, the upper ones subsessile. Flowers in a loose panicle, 

 with opposite branches. Calyx ovate, much smaller than the 

 corolla ; teeth of the upper lip broader. Corolla dull yellow^ 

 half an inch or more long ; tube narrowed ; lower lip fringed. 

 Stamens exserted. Style very long, bifid at the apex. Perfect 

 seed round. 

 Hab. In woods in rich soil among rocks. August. 



There are two varieties of this plant found in the Northern 

 States ; one with leaves on long petioles, the other with the 

 lower leaves on short footstalks, and the upper ones sessile. 



22. CIRC^A. L. 



Calyx 2-leaved, superior. Corolla 2-petalled. Cap- 

 sule 2-celled, not opening ; cells 1-sceded. Gen. pl.^l. 

 Nutt. Gen.l. p. 18. ' Juss. p. 319. Roem. £i? 

 Schult. Gen. 104. Lain. 111. t. XVI. Nat. Ord. 

 Onagri Juss. Enchanter ^s Alght shade. 



1. C. luteiiana ^. canadensis L. : stem erect; leaves 

 ovate, remotely toothed, opaque, nearly smooth. Mich. 

 FL I. p. 14. Vahl Enum. I. p. 301. Pursh Ft. \. 

 p. 21. Elliott Sk.h p. 7. C. canadensis M u h I. Cat, 

 p. 2. C. luteiiana B ig. Bost. p, 8. C. canadensis latifolia 

 tlore albo Tourn. ins t. 30]. CxrcjEa, &c. Clayt. Virg 

 p. 2. 



Root perennial. Stem a foot and a half high, terete, very smooth, 

 simple. Leaves on slender footstalks about 3 inches long, acu- 

 minate ; margin with remote mucronate teeth, and slightly ci- 

 liate ; base often cordate. Flowers in long terminal racemes, 

 alternate and pedicellate. Leaves of the calyx ovate-oblong, 

 equal, rather obtuse. Petals inversely cordate, reddish-white, 

 rather shorter than the calyx. Stamens spreading ; filaments 



