172 TETRANORIA. MONOGYNIA. HEDYOTiii. 



compressed at the top, emarginate so as to appear a little 2- 

 horncd, ppening in a direction across the dissepiment. Seed^ 

 many in each cell, angular. 

 Hab. In a small wood about a mile from Brooklyn, on the Ja- 

 maica road, growing in a wet clayey soil. On the Island ol 

 Ntw-York near Greenwich, and in the borders of a shady 

 swamp near the Elgin Botanic Garden. Au!J:;ust. In New- 

 Jersey. Muhlenberg. In the Southern States this plant 

 attains the height of 12 or 18 inches. 



This plant, though more nearly allied to Hedyotis than to 

 Oldenlandia, differs from the latter, as described in the Ge- 

 nera plantarum, in the corolla being almost rotate, the stigma 

 simple, 8cc. Lamar k has united the two genera ; which I 

 am inclined to think is correct. P urs h suspects that the 

 synonyms of Lamar k and Willd. (ut sup.) belong to 

 IsNARDiA fialustris. 



109. HOUSTONIA. L. 



Calyx 4-toothed. Corolla infundibuliform, 4-cleft. 

 Capsule half superior, 2-celled, 2-valved, many-seeded, 

 opening transversely. Gen. pi. 161. Nutt. Gen. 

 I. p. 94. Juss. p. 197. Lam. III. t. hXXlX, 

 f. 2. Roem. £s? Schult. Gen. 479. Poiretia 

 Gmel. Nat. Ord. Gentianae Jiiss,\ (olim Ru- 



BIACEyE.) 



1 . H« coerulea L, : stem erect, setaceous, dichotomous ; 

 radical leaves spathulate-ovate ; peduncles elongated, 1- 

 flowcred ; segments of the corolla acute. Willd. Spec. J. 

 p. 583. L a m. III. t. 79. f. 1 . Pursh Fl. I. p. lOG. («.) 

 Big. Bost. p. 35. Elliott SA-. I. p. 192. Kutt. Gm. 

 I. p. 95. Roem. ^ Schult. 111. p. 207. Bot. Mag. t. 

 370. H. Linncei a,, elatior Mich. Fl. I. p. 85. Anonymos 

 erecta Walt. Car. p. 86. Pluk. Mant. p. 45. t. 97. f. 9. 

 G r on. Virg. 15,- 



Root perennial. Stem numerous, 4 — 8 inches high, erect, slen- 

 der, quadrangular, dichotomous; branches erect. Radical 

 leaves spathulate, obtuse, smooth ; margin appearing slightly 

 ciliate under a lens ; stem-leaves narrower. Flovjers on long 

 slender peduncles. Teeth of the calyx subulate, many times 

 shorter than the corolla. Corolla purple, sometimes almost 

 white ; segments obovate, acute. Stamens included ; ^la- 

 ments inserted into the tube of the corolla ; anthers oblong, 

 didymous, yellow. Cafisule broadly obcordate, opening at the 



t Annal. du Mus. X. p. 328. 



