POLYGOXACE.E. (BUCKWHEAT FAMILY.) 411 



flowers greenish ; stamens 6 ; style 2 - 3-parted ; achenium flat or triangular. 

 Roadsides in the upper districts. Stem l-2 high. 



9. P. hydropiperoides, Michx. Stem slender, smooth, ascending 

 from a floating or creeping base ; leaves linear or lanceolate, scabrous ; sheaths 

 hispid, long-fringed ; spikes 2-3, linear, rather close-flowered; calvx pale 

 rose color, glandless ; stamens 8 ; style 3-cleft ; acheuium 3-augled. Ditches 

 and muddy banks. July -Sept. 2/ Stem 2 -3 long. Leaves 2' -4' long, 

 not acrid. Spikes 1'- 2' long. 



10. P. setaceum, Baldw. Stem erect, sparingly branched, smooth be- 

 low, the upper portion, like the peduncles and lanceolate glandless leaves, 

 rough \\ith appressed hairs; stipules appressed, hirsute, copiously fringed 

 with long bristles ; spikes filiform, by pairs, loose-flowered ; flowers white, 

 glaudless; stamens 8; style 3-cleft; achenium 3-angIed. Low ground, 

 Georgia and Florida. July -Sept. ^ Stem 2 -3 high. Leaves 3' -5' 

 long. Spikes 1'- 2' long. 



11. P. hirsutum, Walt. Stem erect, densely hirsute with spreading 

 fulvous hairs ; leaves lanceolate, nearly sessile, rounded at the base, hirsute, 

 particularly on the veins and margins ; sheaths hirsute, copiously fringed ; 

 spikes 2-3, linear, erect, rather close-flowered; peduncles smooth above; 

 bracts naked; flowers white, glandless; stamens 8; achenium 3-angled. 

 Pine barren ponds, Florida to North Carolina. July -Sept. 2/ Stem 

 2 -3 high. Leaves 2' -3' long. Spikes 1' long. 



3. AVICULAKIA. Flowers axillary, sinyle or 2-3 together: stamens 8, 

 rarely fewer- stigmas 3, nearly sessile: achenium 3-angled: cotyledons in- 

 cumbent: albumen horny: s/teat/is scarious, 2 - 3-parted, lacerated: leaves 

 small. 



12. P. aviculare, L. Stem prostrate, diffuse, short-jointed; leaves ses- 

 sile (V long), oblong-linear or lanceolate, obtuse, longer than the 3-cleft 

 sheaths ; flowers clustered, nearly sessile, greenish white, longer than the dull 

 achenium ; stamens mostly 5. Waste places and along roads, common. - 

 Var. ERKCTUM. (P. erectum. L.) Stem stouter, erect or ascending, leaves 

 larger (l'-l|' long), oblong. With the preceding. Var. LITTORALE. 

 (P. maritimum, L.) Stem l-2 long, prostrate, rigid, short-jointed ; leaves 

 small (4"- 6"), oblong-linear, glaucous ; the uppermost imbricated and scarcely 

 longer than the conspicuous silvery sheaths ; calyx reddish white, shorter 

 than the smooth achenium. Seacoast sands, Georgia, and northward. 



13. P. tenue, Michx. Smooth; stem erect, branched, sharply angled, 

 slender ; leaves scattered, linear, acute ; sheaths small, fringed; flowers mostly 

 solitary, greenish white ; achenium smooth and shining. Dry rocks in the 

 upper districts. July - Sept. (l) Stem 6' - 8' high. Leaves 6" - 12" long. 

 4. TOVARIA. Flowers scattered in a lontj and slender spike: calyx 4-parted : 



stamens 5, included: styles 2, exserted, persistent: arheninm lenticular: 

 cotyledons accuinbent. 



14. P. Virginianum, L. Stem erect, smooth below; the upper portion, 

 like the leaves and spikes, more or less hairy ; leaves large, ovate or ovate- 

 lanceolate, acute at each end ; sheaths cylindrical, hairy, fringed ; flowers 



