35$ 



POLYGONACEAE (BUCKWHEAT FAMILY) 



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

 glabrous annuals, except nos. 1 and 2. 



lonf 



A.chenes conspicuously exserted. 

 Prostrate, maritime ; achene broadly ovoid-pyramidal. 

 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. x < o ^ c 



Flowers small; sepals (normally 5) white or roseate, 1.3-1. b 

 pedicels included. . 



Erect much branched ; leaves Unear-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 bevond the hyaline flaccid torn stipules 

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



Leaves elliptical, yellowish green, obtuse 



Leaves lanceolate, acute 



Branches rather sharply angled. 



Leaves strongly plicate ; flowers erect . . _ 



Leaves flat with revolute margins ; flowers nodding .... 



1. P. maritimum. 



2. P. Foicleri. 



3. P. exsertum. 



4. P.prolificum. 



5. P. aviculare. 



6. P. erectum. 



T. P. rantosissimum, 



8. P. ienue. 



9. P. Douglasii. 



706. P. maritimum. 

 Flowering branch x % 

 Fruiting calyx X 3. 

 Stem-leaf x 1. 



707. P. Fowled. 

 Upper part of stem 



X %• 

 Fruiting calyx x 3. 



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. Fowleri 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. 



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



3. P. exsertum Small. Erect much branched annual, 3-8 

 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 Saskatchew^an. Fig. 



708. 



4. P. prolificum (Small) Robinson. 

 Erect or nearly so, much branched, 

 slightly rigid, 3 dm. high ; leaves linear- 

 oblong, 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. ramosissinium, var. 

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

 Kan. Fig. 709. 



5. P. aviculare 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 

 pinkish margins ; stamens 8 (rarely 5) ; achene dull and 

 minutely granular-striate, mostly included.— Common every- 



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



708. P. ^xsertum. 

 Fruiting calyx x 3. 

 Stem leaf x i^. 



709. P. prolificum. 

 Flowering branches 



