358 



POIiYGONACEAE (BUCKWHEAT FAMILY) 



1. P.i 



2. P. Fowleri. 

 8. P.eiea»rtmn, 



filaments broad at base; styles 3 ; cotyledons Incumbent; albumen h6rny 

 glabrous annuals, except nos. 1 and 2. 



A cheneft conspicuously exserted. 

 Prostrate, maritime ; acliene broadly ovold-pyramldaL 

 Calyx-lobes petaloid, broadly obovate ; foliage nearly white 

 Calyx-lobes subberbaceoiis, oblonff ; foliage pale green . 



Erect ; achene elongated, lanceolate-pyramidal 



Achenes nearly or quite included by the fruiting calyx. 

 Branebes terete or nearly so. 

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

 pedicels included. 

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



much surpassed by the bristle-like remnants of the stipules . 4. P,prollflcvnH^ 

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



mostly exserted beyond the hyahne flaccid torn stipules . . 6. P. aviculare. 

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



Leaves elliptical, yellowish green, obtuse 6. P. erectum. 



Leaves lanceolate, acute ... ...... 7. P. ramosisslmv/m 



Branches rather sharply angled. 



Leaves strongly plicate ; flowers erect 8. P. fenue. 



Leaves flat with revolute margins ; flowers nodding . . . . 9. P. DouglaaU, 



706. P. maritimum. 

 Flowering branch x %. 

 Fruiting calyx X 8. 

 Stem-leaf x 1. 



Canada and Me.; 



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. FowlSri 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. Bayi Am. 

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



also Wash, to Alaska. Fig. 707. 



707. P. Fowleri. 

 Upper part of stem 

 X % 



3. P. exs§rtum Small. .Breci much branched annual, 3-8 Fruiting calyx 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 linear- 

 ol/long, obtuse or acute, firm, in a dried 

 state veiny ; stipules soon frayed to 

 bristle-like remnants surpassing considerably the small 

 sessile roseate 5-parted flowers. (P. ramosissimum, var. 

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

 Kan. Fig. 709. 



5. P. aviculire L. Slender, mostly prostrate or ascend- 

 ing, bluish-green ; leaves lanceolate, .6-20 mm. long, usually 

 acute or acutish ; sepals hardly 2 mm. long, green with 



709 P proliflcum pinkish margins ; stamens 8 (rarely 6) ; achene dull and 

 Flowering branches ™inutely granular-striate, mostly included. — Common every- 

 X 1^. ^ where in yards, waste places, etc. (Eurasia.) Fig. 710 o. 



708. P. exsertuui. 

 Fruiting calyx x ". 

 Stem leaf x ^ 



