GENUS 4. 



EVENING-PRIMROSE FAMILY. 



589 



4. JUSSIAEA L. Sp. PI. 388. 1753. 



Perennial herbs, with alternate, usually entire leaves, and white or yellow, axillary, soli- 

 tary flowers. Peduncles mostly 2-bracted at the summit. Calyx-tube elongated, cylindric 

 or prismatic, adnate to the ovary but not prolonged beyond it, the limb 4-6-lobed, the lobes 

 acute, persistent. Petals 4-6 (rarely more), inserted under the margin of the disk. Stamens 

 8-12, in 2 rows, inserted with the petals; filaments short. Ovary 4-6-celled; stigma 4-6-lobed; 

 ovules =o. Capsule linear, oblong or club-shaped, angular or ribbed, septicidally dehiscent, 

 crowned with the calyx-lobes. Seeds numerous. [In honor of Bernard de Jussieu, 1699- 

 !777, founder of the Natural System of "Botany.] 



About 35 species, natives of warm and temperate regions, most abundant in America. Besides 

 the following about 7 others occur in the Southern States. Type species : Jussiaea repens L. 

 Creeping or floating ; petals 5 ; pod cylindric. i. /. diffusa. 



Erect ; petals 4 ; pod club-shaped, 4-sided. 2. /. decurrens. 



i. Jussiaea diffusa Forskal. Floating or Creeping Primrose-Willow. Fig. 3023. 



/. diffusa Forskal, Fl. AEgypt. Arab. 210. 1775. 

 Jussiaea repens Sw. Obs. 172. 1791. Not L. 



Stem creeping or floating, freely rooting 

 from the nodes, glabrous, i-3 long. Leaves 

 oval, oval-lanceolate or obovate, slender-peti- 

 oled, glabrous, veiny, obtuse or acute at the 

 apex, narrowed at the base, entire, i'-4' long ; 

 peduncles slender ; flowers yellow, 6" 12" 

 broad ; calyx-lobes 5, lanceolate, acute, shorter 

 than the 5 obovate usually emarginate petals ; 

 stamens 10; capsule cylindric, tapering at the 

 base, ridged, glabrous, I'lr long, \\"-2," 

 thick; seeds in i row in each cell. 



In ponds, Kentucky and Illinois to Kansas, 

 Florida and Texas. Also in tropical America 

 and Asia. Clove-strip. June-Aug. 



2. Jussiaea decurrens (Walt.) DC. 

 Upright Primrose-Willow. Fig. 3024. 



Ludwigia decurrens Walt. Fl. Car. 89. 1788. 

 Jussiaea decurrens DC. Prodr. 3: 56. 1828. 



Erect, stem angled, branching, glabrous, 

 i-2 high. Leaves lanceolate, acute or acumi- 

 nate at the apex, narrowed at the base and 

 decurrent on the stem, entire, i'-4' long; flow- 

 ers very short-peduncled, yellow, 4"-6" broad ; 

 calyx-lobes 4, ovate-lanceolate, acute, about 

 equalling the 4 obovate petals; stamens 8; cap- 

 sule club-shaped, 2-3 times as long as the 

 peduncle, 4-sided, the angles somewhat winged ; 

 seeds in several rows in each cell. 



In swamps, Maryland to Georgia and Florida, 

 Illinois, Arkansas and Texas. July-Sept. 



5. CHAMAENERION [Tourn.] Adans. Fam. PI. 2: 85. 1763. 



Showy perennial herbs, with tufted stems which are often woody at the base. Leaves 

 alternate, leathery, entire ; flowers perfect, irregular, showy, white or purple, in terminal 

 racemes ; calyx-tube not prolonged beyond the ovary, narrow, the 4 calyx-segments decidu- 

 ous; petals 4, entire, broadest above the middle, spreading; stamens 8, declined; filaments 

 dilated at the base; anthers oblong; ovary 4-celled ; united styles filiform; stigmas 4-cleft; 

 ovules numerous, in 2 rows, ascending. Capsule 4-celled, obtusely 4-angled, elongated, 

 opening loculicidally. Seeds numerous, with a tuft of hairs. [Greek, ground rose-bay.] 



About 4 species, chiefly in the north temperate zone. Type species : Epilobium angustifolium L. 

 Bracts small ; lateral nerves of the leaves confluent in marginal loops ; style pubescent at the base. 



i. C. angustifolium. 

 Bracts leaf-like ; lateral nerves of the leaves obsolete ; style glabrous. 2. C. latifolium. 



