ONAGRACE^E. (EVENING-PRIMROSE FAMILY.) 129 



1. N. vertieillata, H. B. K. Smooth or downy; stems recurved (2- 

 8 long), 4 - 6-sided ; leaves lanceolate, nearly sessile, opposite or whorled, the 

 Upper with clustered flowers in their axils on short pedicels ; petals 5, wedge- 

 lanceolate, rose-purple (' long) ; stamens 10, half of them shorter. (Decodon 

 verticillatum, Cmdin.) Swampy grounds, common. July - Sept. 



4. CtJP HE A, Jacq. CUPHEA. 



Calyx tubular, 12-ribbed, somewhat inflated below, gibbous or spurred at the 

 base on the upper side, 6-toothed at the apex, and usually with as many little 

 processes in the sinuses. Petals 6, very unequal. Stamens mostly 12, approxi- 

 mate in 2 sets, included, unequal. Ovary with a curved gland at the base next 

 the spur of the calyx, 1-2-celled: style slender: stigma 2-lobed. Pod oblong, 

 few-seeded, early ruptured through one side. Flowers solitary, stalked. (Name 

 from Ktx^oy, gibbous, from the shape of the calyx, &c.) 



1. C. viscosissima, Jacq. (CLAMMY CUPHEA.) Annual, very vis- 

 cid-hairy, branching ; leaves ovate-lanceolate ; petals ovate, short-clawed, purple. 

 Diy fields, New York to Penn., Kentucky, and southward. Aug. Seeds 

 flat, borne on one side of the placenta, which is early forced out the pod. 



ORDER 43. ONAGRACE^E. (EVENING-PRIMROSE FAMILY.) 



Herbs, with 4-jnerous (sometimes 2 - S-merous") flowers ; the tube of the 

 calyx cohering with the 2 - ^-celled ovary, its lobes valvate in the bud, or obso- 

 lete, the petals convolute in the bud, and the stamens as many or twice as 

 many as the petals or calyx-lobes. There are two suborders, viz. : 



SUBORDER I. ONAGRACE^ PROPER. 



Calyx-tube often prolonged beyond the ovary ; the petals (rarely want- 

 ing) and stamens inserted on its summit. Pollen-grains connected by cob- 

 webby threads. Style single, slender: stigma 2-4-lobed or capitate. Pod 

 loculicidally 4-celled and 4-valved, or indehiscent : placentas in the axis. 

 Seeds anatropous, no albumen. 



1. EPILOBIUM. Stamens 8. Petals 4. Seeds with a large downy tuft at the apex. 



2. (ENOTHERA. Stamens 8. Petals 4. Calyx-tube prolonged. Seeds naked, numerous. 



3. GADRA ^Stamens 8. Petals 4 Calyx-tube prolonged. Pod 1 - 4-seeded, indehiscent. 



4. JUSSL3EA. Stamens 8 -12. Petals 4 -6. Calyx-tube not prolonged. Pod many-seeded. 

 5 LUDWIGTA. Stamens 4. Petals 4, or none. Calyx and pod as in No 4. 



6. CIRC J! A. Stamens 2. Petals 2. Calyx slightly prolonged. Pod 1-2-celled, 1-2- seeded 



SUBORDER IL HALORAGE^E. 



Calyx-tube not at all prolonged beyond the ovary, the lobes obsolete. 

 Petals often none. Stamens 1-8. Fruit indehiscent, 1 -4-celled, with a 

 solitary suspended seed in each cell. Albumen thin. Aquatic plants, 

 with very small axillary sessile flowers, often monoecious or dioecious. 



7. PROSERPINACA. Stamens 3. Fruit 3-sided, 3-celled. Flowers perfect. 



8. MYRIOPHYLLUM. Stamens 4-8. Fruit 4-angled, 4-celled. Flowers moiwvcious. 



9. HIPPUR1S. Stamen 1. Fruit 1-celled. Style slender. Flowers perfect. 



