986 AMMIACEAE 
Leaves reduced to hollow, terete, transversely-jointed petioles pac 
O. filiformis. 
Leaves with simple, pinnate or palmate blades 
Leaf-blades simple, or of 3 palmately di oed leaflets at the 
end of an elongate petiole. 2. O. ternata. 
Leaf-blades pinnately divided. -— 
Fruit e innish, the wings papery. 3. O. rigidior. 
Fruit turgid, the Wings corky. 4. O. turgida. 
1. O. filiformis (Walt.) Britton. Plant 5-18 dm. tall: phyllodia 3-60 em. 
long: fruit elliptie-oval or oval obovate, 5-6 mm. e broadly winged.— 
(WATER-DROPWORT.) — Low Pr a 
eo ponds, swamps, Coastal Plain, Fla. 
to La. and S. C.—Erro hse apparently, 
nr from further N. 
2. O. ternata (Nutt.) Heller. Plant 5- 
dm. tall: leaf-blades, or leaf- rm linear 
filiform: fruit elliptic, 4-5 mm. long.— 
Low pinelands, Coastal Plain, Fla. to N. C. 
3. O. rigidior (L.) Raf. Plant 5-18 dm. 
n leaves with relatively o. often 
thin-winged. — (PIG-POTATO ATER-DROP- 
Ls COW-BANE. pen ps. swamps, and eliffs, various provinces, Fla. 
, Minn., an —0. 2m seems to be an extreme form of this 
irm with very ams leaf. Ma 
4. O. turgida Small. Plant 4-12 dm. tall: leaves and umbels similar to those 
a O. rigidior: fruit elliptic-oval or elliptic- obovate, oc mm. long, thick- 
winged. “Swamps, Blue Ridge and adj. provinces, S. C. to Va., and Coastal 
Plain, S E N 
SERIES 2. GAMOPETALAE 
Petals more or less united, or oeeasionally distinet, or very rarely 
wanting. 
ORDER ERICALES — EnicAnL ORDER 
Herbs, undershrubs, shrubs, or trees, sometimes humus-plants or 
saprophytes. Leaves alternate, often evergreen: blades simple. Flowers 
mainly perfect and complete. Calyx of 2-8, usually 5, partially united 
sepals. Corolla of 2-8, usually 5, mostly united petals. Androecium of 
as many .or twice as many stamens as petals, sometimes partially reduced 
to staminodia: filaments mostly free. Gynoecium of several united car- 
pels. Fruit capsular, baccate, or drupaceous. 
ae With free and distinct filamen 
Superior: fruit exposed or enclosed in the calyx. 
Fam. 1. CLETHRACEAE. 
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Herbaceous root-parasites or saprophytes, with 
Seale-ike leaves: plants devoid of chloro- 
phyl: pollen-grains simple. Fam. 2. MONOTROPACEAE. 
Herbs, undershrubs, shrubs, or trees: plants 
with chlorophyl: pollen- -grains compound. 
