562 



POLYGOXACEAE. 



21. Polygonum littorale Link. Shore 

 Knotweed. (Fig. 1338.) 



Polygonum littorale Link in Schrad. Journ. i: 54. 



1799- 



Annual or perennial, stout, glabrous, bright 

 green or slightly glaucous, stem i-4 long, pros- 

 trate or ascending, diffusely branched from a 

 woody base, striate. Leaves oblong, oblong-lan- 

 ceolate or oblanceolate, 2 // -9 // long, obtuse or 

 subacute at the apex, mostly acuminate at the 

 base, prominently veined, often crisped, jointed 

 to the ocreae; ocreae oblique, 2-parted, at length 

 lacerate; flowers axillary, 2-6 in each cluster; 

 calyx green, its lobes whitish-margined or car- 

 mine; stamens 8; style short, 3-parted to the base; 

 achene broadly ovoid, 3-angled, \W long, more 

 or less narrowed at the base and apex. 



On shores and in waste places, New Brunswick to 

 Minnesota and California, south to Virginia, Illinois 

 and Kansas. Also in Europe. Aug.-Sept. 



22. Polygonum Bellardi All. Bellard's 

 Knotweed. (Fig. 1339.) 



Polygonum Bellardi All. Fl. Fed. 2: 205. pi. 90. f. 2. 



1785- 



Annual, dingy green, stem slender, prostrate or 

 spreading, i-3 long, simple or diffusely branched, 

 striate. Leaves oblong-lanceolate or linear-lanceo- 

 late, short-petioled, 2 // -2o // long, acute at the apex, 

 acuminate at the base, distant, prominently veined 

 beneath, jointed to the ocreae; ocreae oblique, sil- 

 very, slightly lacerate when young, becoming much 

 incised when old; flowers 1-3 together in the axils; 

 calyx green, its lobes white-margined; stamens 8; 

 style 3-parted to the base, very short; achene ovoid 

 or oblong-ovoid, 3-angled, rather pointed at both 

 ends, i // -iX // long, reticulated and rather dull. 



In waste grounds, Washington, D. C. Adventive 

 from eastern Europe or western Asia. 



Polygonum maritimum L. Seaside Knotweed. (Fig. 1340.) 



Polygonum maritimum L. Sp. PI. 361. 1/53. 

 Polygonum gl an cum Xutt Gen. i: 254. 1818. 



Perennial or sometimes annual, glaucous, gla- 

 brous, root usually deep, woody, stem prostrate 

 or ascending, branched, 8 / -2o / long, deeply 

 striate. Leaves ovate or oblong, mostly equal- 

 ling or longer than the internodes, 3"-! 2" long, 

 fleshy, veined beneath, somewhat rugose above, 

 conspicuously jointed to the ocreae, the margins 

 often re volute; ocreae large, silvery, 2-parted or 

 at length lacerate, becoming brown at the base; 

 flowers 1-3 together in the axils, becoming slen- 

 der-pedicel led; calyx white or pinkish; stamens 

 8; style short, 3-parted; achene 3-angled, ovoid or 

 narrowly ovoid, i^" long, acute or acuminate, 

 smooth, shining, longer than the calyx. 



In sands of the seashore. Maine to Florida, 

 on the coast of Europe. July-Sept. 



Also 



