POLYGONE^. 299 



8 P HiRSUTUM. 5'/<w erect, decnml'cnt, branchinc, hairy. Leaves oh]oT)g, 

 often pliiihily corc'ate at the I>a5!p, hairy, entire. Flowers in slender spikes. 

 Stamens 8 S/i/^<' 3 clefr. Perianth white. 



% May— Aug. Sliallow ponds. 1-2 ft. 



9 P Ixc^RiNATi'M Stitn geniculate, sH.ohily angled, scabrous towards the 

 summit. Leaves h\ncfnhv.e, serrulate, pubescent on the upper surface, large. 

 FLoxv^rs in several simple spikes. Stamens 6. Style 2-cleft. Perianth white, 

 or rose colored. 



% July— Oct. Ditches and ponds. 2-3 ft. 



10 P Pennsylvamclm. Stem ireniculate, with swollen joints, glabrousr 

 angled. Affli'e.'* lanceolate, sliyhilv hairy, petiuled. i^/ott-ers in erov ded ob- 

 long spikes, large. Stamens 8. Style 2-cieft. Peduncles hispid. Ptrianth 

 reddish. 



O July — Sept. Margins of ponds. 2-4 ft. 



11 P Orientat.e. Stem erect. Leaves large, ovate, acuminate, minutely 

 pubescent, peiioled. Stipnles hairy. Flovers in crowded spikes, large. 

 ^amejis 6. Styles 2. Perianth rose color, or white. 



O July — Aug. Cultivated grounds. 4-5 ft. 

 (c) Spikes ni panicles. 



12 P PoT.TGAMrM. Stem erect, branching, glabrous. Leaves small, sessile, 

 with glabrous stipules. Spikes patiiculure, jointed. Flowers solitary at each 

 joint. Stamens 8 Styles 3. Perianth while. 



% July— Sept. Pine barrens. Middle Car. & Ga. 6-8 in. 

 (J) Flowers in racemose panicles. Leives subcordate or sagittate. 



13 P Sagittatum. Stem slender, climbinir, angled, retrorsely serrate. 

 Leaves nearly sessile, glabrous, sagittate. Flowers axillary and terminal, in 

 small compact heads, on long peduncles. Stamens 8. Style& 3-cleft. Peri- 

 anth white. 



(v) July — Aug. Wet grounds. 



14 P Arifolium. Stem reirorsely aculeate, prostrate, flexuous, sometimes 

 climbin£, square, pubescent Leaves hastate, on long petioles, pubescent. 

 Spikes few flowered, terminal and a.xillary. Stamens 6. Styles bihd. 



<v) August — Sept. Wet grounds. 



15 P Convolvulus Stem long, climbing, angular, somewhat rough. — 

 Leaves petioled, liasiate-cordate, vvith spreading Tubes. Flovers in axillary 

 racemes. Stamens 8. Styfe 3 cleft. Perianth whitish, or reddish. 



© July— Aug. Field. 



16 P ScANDExs. Stem climbing, glabrous, bright purple, anffled. Leaves 

 broad-cordate, with the margins and veins sliehily scabrous. PUu-ers in ax- 

 illary racemes, large. Stamens 8. Stylts 3. Perianth winged, w hite, or red- 

 dish. 



July — Aug, Shady woods. 



Genus II RUM EX. 



Perianth 6-leaved, in 2 row.s. Stamens 6. Styles 3. Nut 

 triquetrous, enclosed by the three interior valves of the peri- 

 anth. Stigmas many cleft. 



1 R Sanguineus. Stem erect. Radicle leaves large, entire, cordate-lan- 

 ceolate, variegated with red veins. Flov-ers in small, distant whorls. Peri- 

 anth ])ersi?ient, marked on the back with red grains. 



% .lune— July. Fields. 3 ft. Bloody dock. 



2 R PuLcnER. Radicle leaves oblong, with a sinus on each side. Cau- 

 line leaves entire. Perianth ttjoihed. 



% June — July. Introduced. 



3 R VtBTiciLLATUS. Ltaves long, lanceolate, narrow, acute, with cylin- 



