POLYGONAC^. ' 191 



slender, erect, pale rose-coloured. ■ Sepals glandular-dotted. 

 Stamens 8. Aoliene 3-angled^ shining. — Muddy soil or 

 shallow water. 



13. P. Hydrop'iper, L. (Common Smartweed or Water- 

 PEPPER.) Sheaths and leaves as in the last, the leaves, how- 

 ever, larger. Spikes slender, nodding, greenish. Sepals 

 glandular-dotted. Stamens 6. Aohene dull. — "Wet places. 



14. P. ViPginia'num, L. Calyx greenish, unequally 4- 

 parted. Stamens 5. Styles 2, persistent on the flat achene. 

 iFlowers in long and slender naked spikes. Stem upright, 

 nearly smooth. Leaves ovate or ovate-lanceolate, taper- 

 pointed, rough-cilia te. Sheaths hairy and fringed. — Thick- 

 ets, in rich soil. 



<- -1- Leaves heart-shaped or sagittate. Sheaths much longer on one 

 side than on the other. ~ 



15. P. arifo'lium, L., (Halberd-leaved Tear-thumb) 

 with grooved stem, halberd-shaped long-petioled leaves, 

 flowers in short loose racemes, 6 stamens, and a flattish 

 achene, is not uncommon on the Lower St. Lawrence ; rare 

 in Ontario. 



16. P. sagitta'tum, L. (Arrow-Leaved Tear-thume.) 

 Stem, 4-angled, the angles beset with reflexed minute prickles, 

 by which the plant is enabled to climb. Leaves arrow- 

 shaped, ^tamens 8. Achenes 3-angled.— Common in low 

 grounds, especially beaver- meadows. 



17. P. ConvoI'VUlUS, L. (Black Bindweed.) Stem twin- 

 ing, not prickly but roughish ; the joints naked. Flowers 

 in loose panioled racemes, 3 of the calyx-lobes rigid in fruit. 

 Leaves heart-shaped and partly halberd-shaped. Not climb- 

 ing so high as the next. — Cultivated grounds and waste 

 places. 



g8. P. dumeto'rum, L., var. seandens. Gray. (Olimb-^ 

 False Buckwheat.) Stem twining high, smooth; sheaths y 

 ced, 3 of the calyx-lobes winged in fruit. — Moist thicketsj 

 19. P. eilino'de, Michx. Stem twining, minutely downy. 

 Sheaths fringed at the base with reflexed bristles. — Sandy pine 

 woods and rocky hills. 



