28 FOUNDATIONS OF BOTANY 
Ill. ZEBRINA, Schnizl. 
Trailing or slightly climbing herbs. Leaves often striped. 
Flowers irregular, usually in pairs. Calyx with a short tube, 
regularly or irregularly 3-parted. Corolla nearly regular, 
with tube longer than the calyx. Filaments naked or bearded. 
Ovary 3-celled, 3-6-ovuled. 
1. Z. pendula, Schnizl. WANDERING JEw. Stems perennial, 
prostrate, or nearly so, branching freely, rooting easily at the nodes. 
Leaves somewhat succulent, lance-ovate or oblong, crimson beneath, 
green or dark purplish above, often with two wide silvery stripes. 
Cultivated from Mexico. 
8. PONTEDERIACEZ. PIcKEREL-WEED FAMILY. 
Perennial marsh or aquatic herbs, stems simple or branched, 
succulent. Leaves simple, alternate. Flowers solitary or 
spiked, each subtended by a leaf-like spathe, perfect, mostly 
irregular. Perianth corolla-like, 6-parted. Stamens 3 or 6, 
unequal, inserted irregularly in the tube or throat of the 
perianth. Ovary free, style single, stigma entire or toothed, 
ovary lor 3 celled. Fruit a 1-seeded utricle.* 
PONTEDERIA, L. 
Stem erect, from a thick, creeping rootstock, bearing a 
single leaf above the middle and several sheathing, bract-like 
leaves at its base. Radical leaves numerous, thick, parallel- 
veined. Petiole long, from a sheathing base. Flowers in 
terminal spikes. Perianth 2-lipped, lobes of the upper lip 
ovate, of the lower oblong, spreading. Stamens 6, the 3 
upper short and often imperfect, the 3 lower protruding. 
Ovary 3-celled, but only 1 cell ovule-bearing. The 1-seeded 
utricle enclosed by the base of the perianth.* 
1. P. cordata,L. PicKEREL-WEED. Stem stout, erect, 2-4 ft. high. 
Leaves long, from heart-shaped to lanceolate and often halberd- 
shaped, apex and basal lobes obtuse, finely nerved. Spike dense, 
