480 ONAGRACEAE. (Vor. Il. 
4. JUSSIAEA L. Sp. Pl. 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. 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 Ser | petals 5; pod cylindric. 1. J. diffusa. 
Erect; petals 4; pod club-shaped, 4-sided. 2. J. decurrens. 
1. Jussiaea diffusa Forskl. Floating or Creeping Jussiaea or Primrose- 
Willow. (Fig. 2564.) 
J. diffusa Forskl. Fl. AEgypt. Arab. 210. 1775. 
Jussiaea repens Sw. Obs. 172. 1791. Not L. 
Stem creeping or floating, freely rooting from 
the nodes, glabrous, 1°-3° long. Leaves oval, 
oval-lanceolate or obovate, slender-petioled, 
glabrous, veiny, obtuse or acute at the apex, 
narrowed at the base, entire, 1/-4’ long; pedun- 
cles slender; flowers yellow, 6’/-12/’ 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, 1/-114’ long, 114//-2/” 
thick; seeds in 1 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. ) 
Ludwigia decurrens Walt. Fl. Car. 89. _ 1788. 
Jussiaea decurrens DC. Prodr. 3: 56. 1828. 
Erect, stem angled, branching, glabrous, 
1°-2° high. Leaves lanceolate, acute or 
acuminate at the apex, narrowed at the base 
and decurrent on the stem, entire, 1/-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, Arkansasand Texas. July-Sept. 
5. CHAMAENERION Adans. Fam. Pl. 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. 
1. C. angustifolium, 
Bracts leaf-like; lateral nerves of the leaves obsolete; style glabrous. 2. C. lattfolium. 
