358 



POLYGONACEAE (BUCKWHEAT FAMILY) 



filaments broad at base; styles 3; cotyledons incumbent; albumen horny] 

 glabrous annuals, except nos. 1 and 2. 



Achenes conspicuously exserted. 

 Prostrate, maritime ; achene broadly ovoid -pyramidal 



oliage nearl 



/'. null' it i in inn. 



P. Fowlt-ri. 

 P. exsertunt. 



5. /'. tivn'ulitre. 



K- 



Calyx-lobes petaloid, broadly obovate ; foliage nearly white . 

 Calyx-lobes subherbaceous, oblong ; foliage pale green .... 



Erect ; achene elongated, lanceolate-pyramidal 



Achenes nearly or quite included by the fruiting calyx. 

 Branches terete or nearly so. 

 Flowers small ; sepals (normally 5) white or roseate, 1.3-1.8 mm. long; 



pedicels included. 

 Erect, much branched ; leaves linear-oblong, slightly rigid ; flowers 



much surpassed by the bristle-like remnants of the stipules 

 Prostrate or rarely erect ; leaves not firm, bluish green ; flowers 



mostly exserted beyond the hyaline flaccid torn stipules 

 Flowers larger, the pedicels exserted ; sepals (often 6) 2-3 mm. long. 



Leaves elliptical, yellowish green, obtuse 6. P. 



Leaves lanceolate, acute 7. P. 



Branches rather sharply angled. 



Leaves strongly plicate ; flowers erect 8. P. 



Leaves flat with revolute margins ; flowers nodding . . . . 9. P. Douglasii. 



1. P. maritimum L. Prostrate, very 

 glaucous, nearly white ; leaves mostly 

 small, linear-oblong, very thick, usually 

 exceeding the short internodes ; stipules 

 silvery ; sepals broadly obovate, petaloid, 

 contracted at the base, the broad ro- 

 seate tips inclining to spread in fruit. 

 Sandy sea-coast, Mass, to Fla., local. 

 (Eu.) FIG. 706. 



2. P. Fowldri Robinson. Prostrate, 

 pale green ; leaves narrowly elliptic, 

 about equaling the full grown inter- 

 nodes; sepals oblong, herbaceous with 

 white or roseate margin, not con- 

 tracted at the base, rather closely ap- 

 pressed to the achene. (P. Rayi Am. 

 auth., not Babington.) Sea-coast, e. 



Canada and Me.; also Wash, to Alaska. FIG. 707. 



3. P. exsSrtum Small. Erect much branched annual, 3-8 Fruufng cah-x x 3. 

 dm. high; leaves lanceolate, rather light or pale green, 1-3 

 cm. long, usually exceeded by the internodes ; sepals oblong, 

 green, normally 5, unequal, closely appressed to the base 

 of the much exserted chestnut-colored ovate-lanceolate achene. 



Brackish meadows, N. B. to.N. J. ; 



and on sand-bars and prairies, 111., Mo., 



and Neb. to the Saskatchewan. FIG. 



708. 



4. P. prolificum (Small) Robinson. 



Erect or nearly so, much branched, 



slightly rigid, 3 dm. high; leaves Ihn-nr- 



nlilniKj, obtuse or acute, firm, in a dried 



state veiny ; stipules soon frayed to 



bristle-like remnants xnr)><n*nin<i c<msi<lt'r<il>1tj (In sum]! 



.s-r.s-.sv7r roseate .Vparted jlotwrx. ( /'. i'<itH:<>si#xii>uiin, var. 



Small.) Sea-shore, e. Que. to Va. ; also Mo., Neb., and 



Kan. Fu;. 701). 



6. P. aviculare L. Slender, mostly prostrate or <iwnd- 



ing, l)luixh-<jr<'i')i ; leaves lanceolate, 0-20 mm. long, usually 



acuie or acutish : ,svy^//.s hard]>i - nun. !<>H<I. green with 



pinkish margins; stamens S (rarely 5); achene dull and 

 F^weYing branches """"'''Iv granular-st riate. mostly included. Common every- 

 where in yards, waste places, etc. (Eurasia.) FKJ. 710 a. 



706. P. maritimum. 

 Flowering branch x %. 

 Fruiting calyx x 3. 

 8 tern -leaf x 1. 



V 



707. P. F.. 

 Upper part of stem 



708. P. exsertum. 

 Fruiting calyx x :!. 

 Stem leaf x"%. 



Tint 1' proiiticiim 



