HALORAGE^E. 123 



HAS. Ponds. Mass. July. U.Stem 412 inches high. 

 Flowers alternate, sessile. Petak white, 3 times as long as the 

 calyx. 



7. M. procumbens Big. : stem procumbent, round, rooting, branched ; 

 leaves pinnatifid with five or six narrow segments ; flowers axillary, 

 solitary, sessile. 



HAB. Ponds. Danvers, Mass. Resembles M. scabratum of Mi- 

 chaux. 



3. CALLITRICHE. Linn. 



Flowers perfect or imperfect. Bracts 2, opposite, petaloid. 

 Calyx (corol of authors) inconspicuous. Petals none. STE- 

 RILE FL. Stamen 1, (rarely 2) with the filament filiform and 

 exserted ; anthers renilbrm. FKKTILE FL. Styles 2, filiform, 

 glandular. Capsule compressed, 2-celled, 4-seeded. 



Monandria. Digynia. 



1. C. vcma var. intermedia Willd. : upper leaves spatulate-obovate, 

 lower ones linear, obtuse and emarginate ; flowers polygamous ; mar- 

 gins of the capsule obtuse. ^C. keterophylla Pursh. C. verna Mich. C. 

 aquatica Big. 



HAB. In shallow streams. Throughout the U. S. May Aug. 

 . Stem floating, sometimes 2 or 3 feet long. Uppermost 

 leaves crowded into a stellated tuft, and 3-nerved. Flowers soli- 

 tary, axillary, white. 



2. C. autumnalis Linn. : leaves all linear, 1 -nerved, truncate or emar- 

 ginate ; capsule with acute margins ; flowers perfect. C. linearis Pursh. 



HAB. Ponds, &c. N. S. May. 0. Scarcely differing from 

 the former, except in having the leaves more generally linear. 



3. C. terrestris Raf. : procumbent, diffused ; leaveg oblong, uniform, 

 rather obtuse ; capsule grooved on the margin. C. brevifolia Pursh. 



HAB. Swamps, &c. N. Y. to Virg. June Aug. 0. Stem 

 creeping Leaves crowded, short obtuse. Flowers polygya- 



4. HIPPURIS. Linn. 



Tube of the calyx adn'ate to the ovary ; limb minute, entire. 

 Petals none. Stamen 1, inserted into the margin of the calyx. 

 Style filiform, received into a groove of the anther. Nut 1- 

 seeded, crowned with the margined limb of the calyx. 



Monandria, tMonogynia. 

 H. vulgaris Linn. : leaves whorled, linear, acute. 



HAB. Ponds and lakes. N. Y. and Penn. Aug. 1. Stem 

 12 18 inches high, simple, erect. Leaves linear, mostly in 

 whorls of eight. Flowers at the base of the upper whorls, one 

 to each leaf, sessile, minute. Mare's Tail. 



