ONAGRACK/E. (EVENING-PK1MROSE FAMILY.) 129 



I . N. verticillata, 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, Gmelin.) Swampy grounds, common eastward. July-Sept. 



4. CtlFHEA, 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 Kv$6s, gibbous, from the shape of the calyx, &c.) 



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

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

 Dry fields, from Connecticut to Illinois, 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-merous (sometimes 2-3-merous) flowers; the tube of tJte 

 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 OA many or twice as 

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



SUBORDER I. ONAGRACE^E 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: stignia 2-4-lobed or capitate. Pod 

 loculicidally 4-celled and 4-valved, or indehisceut : placenta? in the axis. 

 Seeds anatropous, no albumen. 



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



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

 a GAURA Stamens 8. Petals 4 Calyx-tube prolonged. Pod 1 - 4-seeded, indehiscent. 

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

 5 LUDW1GIA. Stamens 4 Petals 4, or none. Calyx and pod as in No 4. 



6. CIRCJEA. Stamens 2. Petals 2. Calyx slightly prolonged. Pod 1- 2-celled. 1-2 seeded. 



SUBORDER II. HALORAGE^. 



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 mono2cious or dioecious. 



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



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



9 HIPl'URIS. Stamen 1. Fruit 1- celled. Style slender. Flowers perfect 



