CALLITRICHACE^. 645 



cent, as long as the cuspidate bracts; stigmas slender, liairy. — Sandy coast 

 of South Florida. August to October. — Stems 3° -5° long. 



A. rusocarpa, Miclix. Stem tall; leaves ovate-lanceolate, acuminate; 

 fertile flowers crowded in a continuous spike ; utricle flesiiy, more tlian twice 

 as long as the bracts, the angles often punctate-rugose ; stigma rather short, 

 slender-subulate. — Salt marshes, Georgia, and nortliward. — Stem 3° -6° 

 higli. 



A. cannabina, L. Stem and leaves as in the preceding : fertile spikes 

 less densely flowered; utricle less flesiiy, smootli, sharply angled, much 

 longer than tlie linear-subulate bracts; stigma very long and hairy. — 

 Brackish marslies and river-banks, Georgia, and northward. 



Order POLYGONACE^. 



POLYGONUM, L. 



P. Hydropiper, L. (Common SiMAKTWEED.) Annual, smooth; leaves 

 lanceolate, punctate, acrid ; spikes slender, interrupted, nodding ; flowers 

 greenish; stamens 6; style 2-3-parted; achenium flat or triangular. — Road- 

 sides, Northern Georgia, and northward. — Stem l°-2° high. 



Order PIPERACE^. 



Chiefly like Saururaceae, but with a simple one-celled ovary containing a 

 single erect ovule. — Herbs or shrubs. 



PEPEROMIA, Ruiz & Pavon. 



Bracts free. Flowers liermaphrodite. Stamens 2, lateral; anthers 2- 

 valved, extrorse. Stigma solitary. 



P. magnolisefolia, C. DC. Leaves mostly alternate, rigid, petioled, 

 obovate, pelhicid-punctate ; spikes terminal, densely flowered, longer than 

 the leaves ; peduncles as long as the petiole ; bracts rounded, peltate. — East 

 Florida (Garber). — Leaves l.j'-3' long. 



P. leptostachya. Leaves opposite or wliorled, very thin, smaller (I'or 

 less long), 3-nerved ; spikes very slender, ratlier loosely flowered; otiierwise 

 much like the preceding. (Piper leptostachyon. Null.) — Islands at the mouth 

 of the St. John's ( Curtiss). 



Order CALLITRICHACEiE. 



CALLITRICHE, L. 



C. peploides, Nutt. Annual ; stems creeping ; leaves uniform, obovate 

 or spatulate ; fruit nearly sessile, circular, notched at the apex, tlie sides 



