Mt)NO£CIA. POI.YANDRIA.. 2^11 



Order VII.— POLYANDRIA, 



T4S. CERATOPHYLLUM. /.. (Hornwort.) 

 Masc. Calix many-p^j-ted. Corolla none. 

 Stamina 16 to 20, very short. Anthers tricuspid 

 date. Fem. Calix 6-leaved, imbricated. Co» 

 rolla none. Style 1, filiform. JS'iit 1 seeded. 



Aquatic plants with verticillated narrow leaves, dlcho- 

 tomous as.d nnany-paried; flowers axillary, soLtary; truit 

 naked or splnose 



Species. 1. C. (/emersum. Fruit with 3 spines. 2.sub' 

 viersum Fruit spineless. — A genus of 2 species indige- 

 nous also to Europe. 



749. MYRIOPHYLLUxM. i. (Water Milfoil.) 

 Calwc 4 -cleft. Petals 4, caducous. Stamina 

 4, 6, or 8. Germs 4. Siijlcs none. Stigmas 

 pubescent. Seeds 4^ coated. 



Aquatics with verticillated and pseudopinnate leaves; 

 flowers axillary, sessile and solitary; the upper verticills 

 masculine, the lower teminine. 



Species. 3. M. spicatnm. 2- verticiUatttm. Hab. From 

 Canada to Carolina, also in Lower Louisiana. 3. scabra- 

 him. 4. heterophylhim. 



*PTiLOPKyLLUM. t Flowers all hermaphrodite, 

 — Calix 4-cleiU Petals none. Stamina 4, very 

 short; anthers roundish. Styles none. Stigmas mi- 

 nute, pubescent, subcapitate. Seeds 4, coated. 



Aquatic: leaves alternate^ pseudopinnate, the upper- 

 most entire and serrate; flowers sohtary, axillary, bibrac 

 leate at the base. S^ed slj in J^Ivriophylhvn^ wiih which 

 genxis a.nd J^r OS erpinaca i it appears intermediate. 



j*' Feather leaf," from tt/Aov, a feather, and <pvXov, a lea/. 

 This is the Piirshia of Mr. Rafinesque, but scarcely more thtin 

 ^ subgenus. Onosmndium of Michaux is now called Purshia by 

 professor Sprengel. 



i The calix in this plant is frequently 4-cleft, and accompan* • 

 id by 4 stamens, styles and germs. 



