Class XVI.— DIADELPHIA 



L— PENTANDRIA. 



486. PETALOSTEMON. Michaux. 



Petals 5, nearly equal, 4 of them alternating 

 with the stamina, and unitin^^ witii them i'j a 

 cloven tube. Legume l-seeded, included in the 

 calix. 



Herbaceous perennials, with pinnated glandulous leaves, 

 and setaceous stipules; tlowers purplish or white, densely, 

 and almost Imbricately spiked or capitulate, squamosely 

 bracteate. (Petals small, nearly uniform, occupying- the 

 place of 5 of the 10 stamina usual in the FapilionacecE, 

 4 of them alternating- with the 5 stamina, and the 5th oc 

 cupying- the place of the sing-le unconnected stamen.) 



Species. 1. P. candidum. 2. carneum. 3. violaceum. 

 This beautiful species, which retains its fine colour so well 

 in the herbarium, and No. 1, are every wiiere abundant 

 throughout Upper Louisiana probably to the sources of 

 the Missouri. Nos. 2 and 5 are peculiar to the warmer 

 Atlantic states. 4. * villosum. livery where villous; stem 

 decumbent; spike lai-ger, cylindric, subeessile; bractes 

 shorter than the cahx, calix lanuginous, 5-toothed; leaf- 

 lets linear-oblong-, about 7 pair, petals rosaceous. Hab. 

 On the sandy banks of Knife river, neai' Fort ISlandan, 

 Missouri. Flowering in Au,gust. Obs. Root fusiform, 

 large, red, and perenniaJ, -sending- out several decumbent 

 stems; spikes 2 or 3 inches long, larger than in any other 

 species; calix striate; petals obiong.obovate,.pale red. 5. 

 co>ymbosu7n. 



A North American g-enus. 



II.— HEXANDRIA. 



487. CORYDALIS. Ventcnat, Flmaria. L, 

 Calix 2-leaved. Corolla ringent. Filaments 



VOL. II. H 



