Class XVI.— DIADELPHIA 



I.— PENTANDRFA. 



486. PETALOSTEMON. Michaux. 



Petals 5, nearly equal, 4 of tliem alternating 

 with the stamina, and unitin.^ with them in a 

 cloven tube. Legume l-seeded, included in the 

 calix. 



Herbaceous perennials, with pinnated glandulous leaves, 

 and setaceous stipules; flowers purplish or wiute, densely, 

 and almost imbricately spiked or capitulate, squarnosely 

 bracteate. (Petals sma\l, nearly uniform, occupying the 

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

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

 cupying the place of the single unconnected stamen.) 



Species. 1. P. candidwn. 2. carneum. 3. violnceum. 

 Tins beautiful species, v.hich retains its fine colour so well 

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

 throughout Upper Louisiana probably to the sources of 

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

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

 decumbent; spike larger, cylindric, subsessile; bractes 

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

 Jets linear-oblong, about 7 pair, petals rosaceous. II ab. 

 On the sandy banks of Knife river, near Fort Mandvan, 

 Missouri. Flowering in August. Obs. Root fusiform, 

 Jarge, red, and perennial, sending out several decumbent 

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

 species; calix striate; petals oblong-obovate, pale red. 5. 

 corymbosum. 



A North American genus. 



II.—HEXANDRIA. 



48r. CORYDALIS. Ventenat. FuMARIA. L. 

 Calix 2-leaved. Corolla ringent. Filaments 



VOL. II. H 



