266 PONTEDEKIACEAE (^PICKEREL- WEED FAMILY) 



shaped, branching, pendulous ; leaves thread-shaped ; peduncle short, 1-flow- 

 ered ; flower yellow. — E. Va., s. to Fla., and westw. ; growing on the branches 

 of trees, forming long hanging tufts. 



PONTEDEKIACEAE (Pickerbl-weed Family) 



Aquatic herbs, with perfect more or less irregular flowers from a spathe ; the 

 petal-like 6-merous perianth free from the 3-celled ovary; the 3 or 6 mostly 

 unequal or dissimilar stamens inserted in its throat. — Perianth with the fi 

 divisions colored alike, imhricated in 2 rows in the bud, the whole together 

 sometimes revolute-coiled after flowering, then withering away, or the base 

 thickened-persistent and inclosing the fruit. Anthers introrse. Ovules anat- 

 ropous. Style 1 ; stigma 3-lobed or 6-toothed. Fruit a perfectly or incompletely 

 3-celled many-seeded capsule or a 1-celled 1-seeded utricle. Embryo slender, 

 in floury albumen. 



1. Pontederia. Spike many-flowered. Perianth 2-lipped, its flcBhy persistent base inclosing 



the 1-seeded utncle. Stamens 6. 



2. Heteranthera. Spathe 1-few-flowered. Perianth salver-shaped. Stamens 8. Capsule 



many-seeded, 



1. PONTEDERIA L. Pickerel-weed 



Perianth funnel-form, 2-lipped ; the 3 upper divisions united to form the 3- 

 lobed upper lip ; the 3 lower spreading, and their claws, which form the lower 

 part of the curving tube, more or less separate or separable to the base ; tube 

 after flowering revolute-coiled. Stamens 6 ; the 3 anterior long-exserted ; the 

 3 posterior (often sterile or imperfect) with very short filaments, unequally 

 inserted lower down ; anthers versatile, oval, blue. Ovary 3-celled ; two of the 

 cells empty, the other with a single suspended ovule. Utricle 1-celled. — Stout 

 herbs, with thick creeping rootstocks, producing erect long-petioled leaves, and 

 a 1-leaved stem, bearing a spike of violet-blue ephemeral flowers. Eoot-leaves 

 with a sheathing stipule within the petiole. (Dedicated to Pontedera, Professor 

 at Padua in the 18th century.) 



1. P. cordata L. Leaves heart-shaped, blunt ; spike dense, from a spathe- 

 like bract ; upper lobe of perianth marked with a pair of yellow spots (rarely 

 all white); calyx-tube in fruit crested with 6-toothed ridges. — N. S. to Ont., 

 Minn., and Tex. July-Sept. (Trop. Am.) Var. ANGnsTiF6LiA Torr. Leaves 

 lanceolate or triangular-attenuate, roundish or truncate at base. — Same range. 



2. HETERANTHERA R. & P. MtJD Plantain 



Perianth with a slender tube ; the limb somewhat equally 6-parted, ephemeral. 

 Stamens In the throat, usually unequal ; anthers erect. Capsule 1-celled or 

 incompletely 3-celled by intrusion of the placentae. — Low herbs, in mud or 

 shallow water, with a 1-few-flowered spathe bursting from the sheathing side 

 or base of a petiole. (Name from ir^pa, different, and AvB-qpi, anther.^ 



* Stamens unequal; 2 posterior filaments with ovati yellow anthers; the other 

 longer, with a larger oblong or sagittate greenish anther, capsule incom- 

 pletely S-celled ; leaves rounded, long-petioled; creeping or floating plants. 



1. H. renif6rmis R. & P. Leaves round-kidney-shaped to cordate and acute ; 

 spathe 3-5-flowered ; flowers white or pale blue. — Ct. to Neb., and southw. 

 (S. A.) 



2. H. limbsa (Sw.) Willd. Leaves oblong or lance-oblong, obtuse at both 

 ends; spathe J -flowered; flowers larger- blue. — Va. to Neb., and southw. 

 (S. it} 



