320 



700. POLYGONUM. 



i. Stamens 5. Sp. 3. 

 ii. Stamens 6. 



a. Styles distinct. Sp. 4-6. 



b. Styles united below. Sp. 7-11. 

 iii. Stamens 8. Flowers panicled. Sp. 12. 



C. Fl. axillary. Stem branched, diifuse. 

 Ochreas or Stipules 2-lobed. 



i. Annual, herbaceous. Sp. 13-15. 



ii. Perennial, somewhat woody. Sp. 

 16-21. 



D. Stem twining ! L. cordato-sagittate. Sp. 

 22, 23. 



K. Stem not twining. L. cordato-sagittate. 

 Cotyledons contorto-conduplicate. Sp. 24, 

 25. 



A. Root fleshy . Stem simple, with a single, 

 s^nJce-like, terminal raceme. Styles 3. 



1. Sistorta. L. (ovate, Sm.) (oblong, 

 Beet.) (ovato-lanceolate, Duby) (somewhat 

 cordate, Koch) wavy, attenuate, p. 6, 7- 

 Moist meadows, oca. 



Margin 



2. viviparum. L. lanceolate 

 revolute, with copious prominent veins, p 

 6-8. Mountain pastures. Not common. 



S. Root fibrous. Stem branched, bearing 

 many spike-like racemes. Styles usually 2. 

 Stipules (or Ochreas) sheathing, undivided. 



i. Stamens 5. 



3. amphibium. Styles united half-way. 

 Rac. oval. Stem rooting at base. L. ovato- 

 lanceolate. p. 6-8. Water or wet places. 



ii. Stamens 6. 

 a. Styles distinct. 



4. lapathifoliuna. Kac. oblong, on glan- 

 dular stalks. Seeds hardly covered by calyx. 

 Stem erect, swelling at knots. L. oblongo- 

 lanceolate. Lower Stipules not fringed, a. 

 7-9. Bich moist. 



p. incanum. L. hoary beneath. 



5. laxum. Rac. slender, on glandular 

 stalks. Seed completely covered by calyx. 

 Stem often prostrate. L. lanceolate, wavy. 

 Stipules with a short fringe, a. 7-9. Damp 

 gravelly. — Bab. 



6. tenmflorum. " Rac. filiform, on glan- 

 dular stalks, nodding. Stem ascending. L. 

 lanceolate, with glandular dots beneath. Sti- 

 pules sometimes with a short fringe. Seeds 

 pitted, a. 7-10. Moist. Abr. Palermo."— 

 Guss. 



b. Styles united below. 



7. Persicaria. Raceme oblong. Stalks 

 smooth. Stems ascending, swelling at the 

 knots. L. lanceolate. Stipules hairy, with 

 a short fringe, a. 7-9. Wet. 



8. serrulatuxu. " Styles nearly distinct. 

 Rac. filiform, on smooth stallcs. Cal. without 

 glands. Stem ascending. L. lanceolato-linear, 

 broad at base, serrulato-ciliate, minutely granu- 

 late beneath. Stipules with a long fringe. 

 a. 6-9. Wet. Sarzana. Pal." — Bert. 



9. minus. Stamens 6 (5, Koch). Rac. 

 filiform, nearly erect. Stalk smooth. Cal. 

 without glands. Stem decumbent. L. lineari- 

 lanceolate, flat. Stipules with adpi-essed hairs 

 and a copious fringe, a. 8, 9. Moist, occ. 



10. mite. Rac. filiform, lax. Stalks smooth. 

 Cal. without glands. Stem ascending. L. 

 lanceolate. Stipules with scattered hairs and 

 a long fr-inge. a. 7-10. Wet. occ. Taste 

 not pungent. 



11. Hydropiper. Rac. filiform, nodding. 

 Stalks smooth. Cal. covered with glandular 

 dots. Stem erect. L. lanceolate, wavy, cUiate. 

 Stipules with a few adpressed hairs and a short 

 fringe, a. 8, 9. Wet. 



iii. Stamens 8. 



12. alpinum. Erect. PI. in a terminal 

 panicle. L. lanceolate, wavy, cihate, downy 

 beneath. Ochreas hairy, very short, p. 7, 8. 

 Biich mountain meadows. Val. Urseren. Uri. 

 VaU. it. Alps. Monte Orsano in Apenn. 



C. Flowers axillary. Stamens 8. Styles 3. 



Ochreas 2-lobed. 



i. Annual, herbaceous. 



13. avicTilare. L. elliptic or lanceolate. 

 Stipules about 6-nerved. Branches leafy to the 

 end. Seeds ruguloso-striolate, shorter than 

 calyx, a. 7-10. Fields and uncult. 



14. Hellardi. L. elliptical; upper lan- 

 ceolate. Ends of Bracts leafless. Stipules 

 about 6-nerved. Seeds ruguloso-striolate. Pro- 

 bably P. pulcheUum of Lois. a. 6, 7. Fields. 

 Trieste. Pr. 



15. Haii. L. eUiptico-lanceolate. Branches 

 leafy to end. Stipules about 6-nerved. Seeds 

 exceeding calyx, a. ? 8, 9. Sandy shores. 

 w. and s. Eng. w. Pr. 



ii. Perennial, somewhat woody. 



16. ni.aritim.unii. Prostrate. L. coria- 

 ceous, elliptic or lanceolate, glaucous. Ochreas 



