6 Leaves reduced upwards, scale-like 
/O above; branches angled 
§ Lower leaves commonly 1-2 mm. broad; 
/2 flowers campanulate 7. Eespergulariaeforme 
g Lower leaves commonly 3-5 mm broad 
"7% OF more; flowers evoid- 8. Be Douglasi 
—, 
Zz Leaves 5-20 cme long}, conmonly lanceolate; 
‘ 
4 ( ¢ mostly perennials growing in meadows or swampy , 
os \ muddy places 
| \ 
| 
{ 4 Flowers..in a loose open panicle 15-20 cm. long, 
+n sec yachenes 5-60) ma. long, brown, highly 
6 ¢ polished 9. Be Salpinun 
4 Flowers in spikes or narrow rather close 
{ af racemes , these solitary or panicled; 
“ \achenes 2-4 mn. long, blacko,2 
4 —_— 
c 
4 
oe, 
6 Flowers in a dense solitary spike 1-5 cm. 
lv long, «5-< cm. wide 
6 spike terminating the Stems plant 
/& erect Jo Bs_bistortoides 
q) & Spike axillary, it and the peduncle 
: F pemsaite than the leaves; plants 
lz _ bvostrate, Creeping in mud or 
floating ') Be natans 
(, Flowers in narrow, rather close racemés 
10 J-5 Cme long, 5=8 mu. in diameter, 
solitary or panicled 
G Racemes commonly 2, less often 1; 
leaves 10-20 cm. long, 4-5 cm. 
12{ broad, rounded, even cordate, at 
\ base 12, Pe coccineum 
( Racemes commonly several or numerous ; 
,of leaves 5-10 cm. long, attenuate at 
'S \ base 
/O sheaths without bristles; bracts 
/ of inflorescence ovate, subacute; 
/4\perianth not glandular dotted 13 P. lapathifolium 
)om »heaths with bristles; bracts of 
. ee inflorescence truncate; verianth 
‘" \elandular dotted or smooth 
a eect 
Ww ia, Serianth clandular dotted: achene 
/G dull, minutely striate /4, 1 Hydropiper 
* Ferianth not clandular dotted; 
ji, acnene shining ‘S. Be FPoersicaria 
— 
