480 



ONAGRACEAE. 



[Vol.. II. 



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 co . Capsule linear, oblong or club-shaped, angular or ribbed, septicidally de- 

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

 1699-1777, 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. 



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



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



i. Jussiaea diffusa Forskl. Floating or Creeping Jussiaea or Primrose- 

 Willow. (Fig. 2564.) 



J. diffusa Forskl. Fl. AEgypt. Arab. 210. 1775. 

 Jussiaea rcpcns Sw. Obs. 172. 1791. Not I,. 



Stem creeping or floating, freely rooting from 

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

 oval-lanceolate or obovate, slcnder-petiolcd, 

 glabrous, veiny, obtuse or acute at the apex, 

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

 cles slender; flowers yellow, 6 // -i2 // broad; 

 calyx-lobes 5, lanceolate, acute, shorter than 

 the 5 obovate usually emarginate petals; sta- 

 mens 10; capsule cylindric, tapering at the 

 base, ridged, glabrous, i'-i}4' long, i^"-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. June-Aug. 



2. Jussiaea decurrens (Walt.) DC. 

 Upright Primrose- Willow. (Fig. 2565.) 



Ludtyigia 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 

 acuminate at the apex, narrowed at the base 

 and decurrent on the stem, entire, i'-4' long, 

 flowers very short-peduncled, yellow, 4 // -6 // 

 broad; calyx lobes 4, ovate-lanceolate, acute, 

 about equalling the 4 obovate petals; stamens 

 8; capsule 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, 

 west to Illinois, Arkansas and Texas. July-Sept. 



5. CHAMAENERION 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 (coma) at the end. [Greek, 

 ground rose-bay.] 



About 4 species, chiefly in the north temperate zone. 



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. 



