350 ORDER 150.-JUNCACE^E. 



than the 9 12 stamens. Styles subulate. Capsules 3-lobed. Seeds oc 

 bristle-pointed. U Rush-like stem and leaves dry and rigid. 

 P. tonnifolia Rich. Bogs, S. 1 2f. Sept., Oct. Leaves perennial, erect, very nar- 

 row, If, and bracts sheathing. Rac. loose, of few light-yellow, star-like flowers (!'). 







ORDER CXLIX. PONTEDERIACE^E. PONTEDERIADS. 



Plants aquatic, with the leaves parallel-veined, mostly dilated at base. 

 flowers spathaceous. Perianth tubular, colored, 6-parted, often irregular. 

 Stamens 3 or 6, unequal, perigynous. Ovary free, 3-celled. Style 1. Stigma 

 simple. Capsule 3-(sometimes l-)celled, 3-valved, with loculicidal clehis- 

 cence. Seeds numerous (sometimes solitary), attached to a central axis, 

 Albumen mealy. 



* Flowers irregular, bl ue. Stamens 6. Utricle 1-seeded, (2 cells abortive) PONTEDERI A. 1 



* Flowers regular, x cyanic. Anthers 3. of 2 forms. Leaves reniform HETKRANTHERA. 2 



x yellow. Anthers 3, of 1 form. Leaves linear SCHOLLEKA. 3 



1. PONTEDERI A, L. PICKEREL WEED. Perianth bilabiate, under 

 side of the tube split with 3 longitudinal clefts (the 2 lower sepals free), 

 circinate after flowering and persistent. Sta. unequally inserted, 3 near 

 the base and 3 at the summit of the tube. Utricle 1-seeded. it ? Leaves 

 radical, long-petioled. Stem 1-leaved, bearing a spike of blue flowers. Jl. 



1 P. cordata L. Lvs. ovate to oblong-deltoid, cordate, with rounded lobes ; petiole 



shorter than the peduncle: spike cylindrical, pubescent, 2' long. In slow waters: 

 com. A fine, showy plant, its blue spikes and smooth leaves 1 2f above the water, 



2 P. lancifolla Muhl. Lvs. lance-oblong to lance-lin. ; fls. as above. S. Apr., May. 



2. HETERANTHERA, R. & P. Tube of the perianth long and slen- 

 der, limb 6-parted, equal. Stamens 3, lower anther oblong-sagittate, on 

 a longer filament. Capsule 3-celled, ao-seeded. U ? Leaves mostly reni- 

 form, long-petioled. July, August. 



1 H. reniformis R. &. P. St. prostrate or floating ; Ivs. roundish, reniform or auric- 



ulate at base ; epathe acuminate, 3-5-flowered ; flowers white. N. Y., Pa., and W. 



2 H. llmosa Vahl. Leaves ovate-oblong, both ends obtuse ; pathe 1-flowered, long- 



mucronate ; flowers blue. S. and W. (Carruth). Lvs. 1 1 A/ , the stalks thrice longer. 



3. SCHOLLERA, Schreber. Tube of the perianth very long and slen- 

 der, limb 6-parted, equal. Sta. 3, with similar anthers. Caps. 1-celled, 

 oo - seeded. U ? Leaves sheathing at base, grass-like, submersed. Stem 

 floating, rooting at the lower joints. 



S. graminea Willd. A grass-like aquatic, in flowing water, N. 1 3flong. Leaven 

 1 2" wide. Flower solitary, 2J 7 long, spathe half as long. July, August. 



ORDER CL. JUNCACE^E. RUSHES. 



Grass-like or rush-like 7ierbs, with small, dry, greenish flowers. Perianth 

 liliaceous in form, more or less glume-like, regular, 6-leaved, in 2 series, 

 persistent. Stamens 6, rarely 8, hypogynous. Anthers 2-celled, introrse. 

 Style 1. Capsule 3- or 1-celled, 3-valved. Albumen fleshy. Figs. 144, 467. 



