DIANDRIA, MONOGYNIA. 



very numerous, on aggregated spikes. Somewhat rare, though 

 plentiful where found Wiodhmi$ t on the blull of a hill bor- 

 dering the Schuylkill ; and in a shady wood near Povsclton. Pe- 

 rennial. July and August. 



5. Hemianthvs, Nuttall. (Journ. Acad. Nat. Sci. Ph. Vol. 

 I. p. 119.) ( Lishnac/ua . ) 



Cat. tubular, 4-toothed at the border, cleft on 

 the under side. Cor. monopetalous bi-la- 

 biate ; tube gibbous, upper lip obsolete 

 truncate, lower lip 3-parted, curved inwards 

 in an arch, truncate. Stam. with bifid fila- 

 ments, the lateral stipes bearing anthers. 

 Style.bihd. Cap 1-locular, 2- valved, many- 

 seeded. Seeds shining, ovate. Nutt. 



1. H. Root fibrous. Stem dichotomous, filiform, micramhi 

 repent, crowded with leaves. Leaves sessile, sub- m0lde$ - 

 elliptic, or oblong-elliptic, entire, opposite, and 

 ternate, obsoletely 3-nerved. Nutt. abr. 



Herpestris micranthra Pursh ? 



Icon. Journ. Acad. Nat. Sci. Ph. Vol. I. t. 6. 



fig. 2. 



A minute, creeping, sub-aquatic plant, detected July, 1817, 

 first by Mr. Nuttall, and the succeeding day found plentifully 

 by him and rmself, on the low gravelly shores of the Delaware, 

 at low tide, near Kensington. Grows in company with Isoetes 

 lacustris, Tillxa. Nutt. Limosella tcuifolia. Nutt. Crypta mini- 

 ma, Nutt. Eriocolon flavidulum, and Alismasubulata- Pursh. 

 Annual, flowers from the last of July to September. 



6. Gratiola L. Gen.pl. 37. ( ' Scrophulari*. J 



Cal. 5 -parted, often bi-bracteate at the base. 

 Cor. tubulose, resupinatc, and sub-bilabiate; 

 the upper lip, 2-lobcd or emarginate ; the 

 lower 3-cleft and equal. Filaments 4, — 2 

 fertile, the other 2, for the most part, sterile. 

 Stigma 2- valved, many-seeded. Dissepi- 

 ment contrary to the valves. 



