GENERA AND SPECIES. 
Polygonum. 
1. Flowers in axillary clusters. 
Stems prostrate, short compact; leaves very small, 
narrow-spathulate to linear; nut triangular smooth 
and shining 
11. Flowers in spikes. 
Prostrate, somewhat hairy; spikes axillary, ae ub 
shortly stalked ; fruit triangular aa “¢ 
Slender erect, glabrous; spikes more or less BL 
Sepals glandular-dotted, green or reddish 
Stipular-tube truncate without cilia ; 
with glandular dots 
leaves 
Stipular-tube inflated, shortly ciliated 
Sepals without glandular dots. 
Stipular-tube bordered by long cilia; sepals 
red ; fruit bi- or tri-angular; leaves mostly 
narrow-lanceolate 
Stipular-tube shortly ciliate ; leaves lanceolate 
tapering into a very long point, and con- 
tracted into a rather long stalk 
Muehlenbeckia. 
Stem prostrate or climbing; leaves large, broad; flowers 
in interrupted spike-like racemes; fruit-calyx 
usually very succulent 
Stems erect ; leaves narrow, tapering at the base. 
Flowers in terminal spikes; branchlets slender, 
interlacing ; fruit prominently 3-angled ; leaves 
linear ... A ay dee A ‘6 oad 
strictly erect; fruit 
leaves broadly linear 
Flowers in axillary clusters ; 
globular, 3-angled ; 
ORDER CHENOPODIACEAE. 
I. Leaves developed. Embryo almost annular 
Calyces of two forms;—calyx of staminate flowers, 
small equally lobed; calyx of pistillate flowers 
with 2 appressed segments enlarged in fruit 
Calyx of 3 or 1 minute dry clavate segments... 
Calyx equally 5-lobed, without appendages. 
Fruit a berry; seed flattened, horizontal ... 
Fruit dry, fruiting calyx unchanged ; seed hori- 
zontal flattened, or vertical and less compressed 
plebeium 
prostratum 
lapathifolium 
Hydropiper 
minus 
attenuatum 
adpressa 
Cunninghami 
polygonoides 
Atriplex 
Dysphania 
Rhagodia 
Chenopodium 
