380 MONOCOTYLEDONOUS PLANTS. 



2. 8. amtricanum Nutt. : lower leaves equal with or exceeding the 

 stem, which is nearly simple ; floral ones concave at base and* erect ; 

 stigma always simple, ovate-oblong, oblique, scarcely more than half 

 the length of the style. P. simplex Pursh. ? 



HAB. Ponds and Jakes. N. Y. to Car. Aug. If. -Stem a foot 

 high, simple or divided at base. Lower leaves carinate. Fer- 

 tile heads 2 5, mostly sessile. 



3. S. natans Smith : leaves floating, flat ; common flower-stalk sim- 

 ple ; stigma ovate, very short ; head of sterile flowers subsolitary. 

 S. angustifblium Mich. 



HAB. ^ Lakes, &c. Can. and N. S. Aug. It. Stem long and 

 slender. Leaves very long, pellucid. Found by Mr. G. W. 

 Clinton, in a lake on Catskill mountains. 



2. TYPHA. Linn. 



Flowers collected into a long dense cylindrical spike. STE- 

 RILE FL. Perianth none. Stamens 3, together upon a chaffy 

 or hairy receptacle, united below into one common filament. 

 FERTILE FL. Perianth none. Pericarp pedicellate, sur- 

 rounded at baso wjth hairs resembling a pappus. 



Monoecia. Triandria. 



1. T. latifulia Lirtn. : leaves linear, nearly flat ; sterile and fertile 

 spikes close together, both cylindrical. 



HAB. Marshes and pools. Can. to Car. July, Aug. 1(. Stem 

 5 6 feet high. Leaves very long. Flowers in a compact cylin- 

 drical spike. Cat Tail. Reed Mace. 



2. T. angustifolia Linn. : leaves linear, channelled ; sterile and fer- 

 tile spikes a little distant from each other ; both cylindrical. 



HAB. Marshes, &c. N. Y. to Vir. July, Aug. 11. Stem 45 

 feet high. Leaves narrower than in the preceding. 



ORDER CXXXV. AROIDE^. Juss. Lind. 



. Flowers diclinous, arranged upon a spadix, often naked. 

 Perianth 4 6-parted, or wanting. Stamens definite or inde- 

 finite, hypogynous, very short ; anthers 1- 2- or many-celled, 

 ovate, turned outwards. Ovary free, 1- rarely 3-celled ; stig- 

 ma sessile. Fruit succulent or dry, not opening. Seeds so- 

 litary or several ; embryo in the axis of fleshy or mealy albu- 

 men, straight, cylindrical, with a cleft on one side in which 

 lies the plumule ; radicle next the hilum, rarely at the oppo- 

 site extremity. 



Herbs or shrubs. Roots often tuberous or thickened. Leaves 

 sheathing at base, with parallel or branching veins. 



