PLANTS OF SOUTHERN NEW JERSEY. 381 



c. Leaves whorled around the stenii flowers minute, greenish. 



d. Leaves about i mm. broad at the base, branching and only 

 the terminal divisions filiform, flowers sessile, axillary. 



Ceratophyllum, p. 446 



dd. Leaves filiform throughout, except on a stalk which rises 



above the surface, bearing minute greenish flowers and small 



lacerate-toothed leaves. Myriophyllum, p. 587 



cc. Leaves not in whorls. 



d. Flowers single with showy white or yellow petals, 5-8 mm. 

 long. Ranunculacece, p. 448 



dd. Flowers small, greenish, whorled on an erect hollow stalk. 



Hottonia, p. 630 

 aaa. Plant growing in water or creeping on the mud, flowers small and incon- 

 spicuous. 



b. Leaves uniform or rounded, 4-20 mm. broad, flowers axillary 

 toward the end of the stem, brownish with red anthers. 



Chrysosplenium, p. 472 

 bb. Leaves opposite spatulate entire, 12-25 nim. long, flowers axillary. 



Isnardia, p. 580 

 bbb. Leaves alternate lanceolate, 20-50 mm. long, sharply serrate or 

 incised pinnatifid. Proserpinaca, p. 586 



6666. Leaves minute, oblonge linear, flowers very minute. 

 c. Leaves opposite. 



d. Stem slender, leaves lanceolate, no perianth. 



Callitriche, p. 529 



dd. Stem stout, leaves nearly orbicular, petals and sepals 



present. Blatine, p. 558 



ddd. Plant fleshy, leaves oblong. 8-15 mm. long. Glaux, p. 633 



cc. Leaves alternate, divided into several short, remote, linear 



lobes. Myriophyllum, p. 587 



bbbbb. Leaves (or sterile stems) terete or widening slightly into a blade, 



2-8 mm. high, erect from the trailing stem. 



c. Flowers in peduncled umbels. Lilaeopsis, p. 598 



cc. Flowers single on slender pedicels. Limosella, p. 681 



ccc. Flowers sessile in a slender spike higher than the terete 



sterile stems. Myriophyllum, p. 587 



TREES^ WOODY SHRUBS OR WOODY VINES. 



0. Prostrate or low shrubby plants, less than 3 dm. in height. 

 6. Stem trailing. 



c. Leaves oval or nearly orbicular, thick evergreen, flowers deli- 

 cate pink, salver-shaped. Bpigcea, p. 619 

 cc. Leaves 4-8 mm. long, narrowly oblanceolate, awl-pointed flowers, 

 star-like, white. Pyxidanthera, p. 629 

 ccc. Leaves 6-17 mm. long, linear oblong, whitish below, corolla 4- 

 parted, petals reflexed, white or pinkish. Oxycoccus, p. 677 

 cccc. Leaves 12-25 mm. long , spatulate, flowers urn-shaped, pinkish or 

 white. Arctostaphylos, p. 621 



