CALLITRICHACEJ3. 645 



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

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



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

 fertile flowers crowded in a continuous spike ; utricle fleshy, more than twice 

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

 slender-subulate. Salt marshes, Georgia, and northward. Stem 3 - 6 

 high. 



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

 less densely flowered; utricle less fleshy, smooth, sharply angled, much 

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

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



ORDER POLYGONACE^E. 



POLYGONTTM, L. 



P. Hydropiper, L. (COMMON SMAKTWEED.) 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^E. 



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

 single erect ovule. Herbs or shrubs. 



PEPEBOMIA, Ruiz&Pavon. 



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

 valvecl, extrorse. Stigma solitary. 



P. magnolise folia, C. DC. Leaves mostly alternate, rigid, petioled, 

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

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

 Florida (Garber). Leaves IJ-'-S'long. 



P. leptostachya. Leaves opposite or whorled, very thin, smaller (!' or 

 less long), 3-nerved ; spikes very slender, rather loosely flowered; otherwise 

 much like the preceding. (Piper leptostachy on, Nutt.) Islands at the mouth 

 of the St. John's ( Curtiss). 



ORDER CALLITRICHACE^. 

 CALLITRICHE, L. 



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

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



