ONA GRACES. (EVENING-PRIMROSE FAMILY.) 129 



1. IV. verticillata, II. B. K. Smooth or downy; stems recurved (2° 

 8° lorn;), 4-6-sided; leaves lanceolate, nearly sessile, opposite or whorlcd, the 

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

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

 verticillatum, Gmelin.) — Swampy grounds, common eastward. July-Sept. 



4. CUP HE A, Jacq. Ccphea. 



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-celIed: style slender: stigma 2-lobcd. Pod oblong, 

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

 from Kv(f>6s, gibbous, from the shape of the calyx, &c.) 



1. C viscosissillia, Jacq. (Clammy Clthea.) Annual, very vis- 

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

 — Diy 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. ONAGRACEiE. (Evening-Primrose Family.) 



Herbs, with A-merous (sometimes 2 - 3-merous) jlowers ; the tube of the 

 calyx cohering with the 2 - 4-celled ovary, its lubes valcale in Uie 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. ONAGRACEiE 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 1-valved, or indehiscent : placentae in the axis. 

 Seeds anatropous, no albumen. 



1. EPILOBIUM. Stamens 8. Petals 4. Seed3 with a large downy tuft at the apex. 



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



3. GAUUA Stamens 8. Petals 4 Calyx-tube prolonged. 1'od 1-4-seeded, indehiscent. 



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

 6 LUDWIGIA. Stamens 4 Petals 4, or none Calyx and pod as in No 4. 



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



Suborder II. HAL OR A GE^. 



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. Stamen3 3. Fruit 3-sided, 3-celled. Flowers perfect. 



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

 » HIPPURIS. Stamen 1. Fruit 1- celled. Style slender. Flowers perfect. 



