POLYGONACBiE. 189 



1. ERIOG'ONIJIM, Michx. 



1. E. fla'VUm, Nutt. Woolly throughout, a few inches 

 high. Leaves oblanceolate. Umbel of 3-9 rays, on a naked 

 peduncle. Flowers yellow, silky. — N.'W. 



S. POIiYO'OKVM, L. Knotweed. 



* Flowers along tlte stem, inconspictioiis, greenish-white, nearly sessile 

 in tlte axils of the small leaves. SIteaths cut-fringed or torii. 



1. P. marit'imum, L. (Coast ICnotgeass.) Prostrate 

 with stout stems, glaucous. Leaves thick, oval to narrowly 

 oblong. Flowers in the axils of leaves, clustered. Stipules 

 very conspicuous. Stamens 8. Achenes smooth and shin- 

 ing, projecting above the calyx. — Sea-coast. 



2. P. avieula're, L. (Knotgrass. Goosegeass.) A weed 

 everywhere in yards and waste places. Stem prostrate and 

 spreading^ Stamens chiefly 5. Achene 3-sided, dull. 

 Stigmas 3, Leaves sessile, lanceolate or oblong. Var. 

 eFeetum, Both. {P. erectum, L.) is upright and larger, with 

 broader leaves. 



3. P. ramosis'simum, Michx. Erect or ascending, s/el- 

 lovoish-green. Leaves lanceolate to linear, acute, very small 

 above. Sepals mostly 6 ; stamens 3-6. AchenS smooth and 

 shining. — Chiefly westward ; sandy places. 



4. P. ten'ue, Michx. Stem slender, upright, sparingly 

 branched, angled. Leaves sessile, narrowly linear, very 

 acute, S-nemed. Stamens 8. Achene dull black. — Dry soil 

 ai)d rooky places. 



* * Flowers in terminal spikes or racemes, mostly rose-coloured or 

 pinkish, occasionally greenish. 



-»- Leaves not heart-shaped or arrow-sliaped. 



3. P. lapathifO'lium, L. Sheaths not fringed, slem 



nearly smooth, 3-6 feet high. Leaves long, tapering from 



near the base to a narrow point, rough on the midrib and 



margins. Spikes oblong to linear and erect or nearly se. 



Sia mens S. Styles 2. Achene fiat or hollow-iided, — In muddy 



places along streams and pon,ds, 



