28 FOUNDATIONS OF BOTANY 



m. ZEBRINA. 



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, 

 Avith tube longer than the calyx. Filaments naked or bearded. 

 Ovary 3-celled, 3-6-ovuled. 



1. Z. pendula, Schnitzl. 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. PONTEDERIACE^. 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 1 or 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, 



