of persistent or deciduous narrow bracts. 
AMMIACEAE 971 
4. H. verticillata Thunb. Leaf- op EA to oval, E. -6 em. wide, 
shallowly erenate: pedicels very short ing: fruit 3—4 mm. wide, with 
slender ribs.—Low grounds, pio and ier Coastal Plain d adj. pro 
inces, Fla. to Tex., Ark. and Mas 
5. H. australis Coult. & Rose. Similar to H. Canbyi in Pas fruit slightly 
aes than long.—Low grounds, Coastal Plain, Fla. Tex. and Va. 
(W. I.) 
6. H. ranunculoides L. f. Leaf-blades De - prd reniform, 2-5 em. 
wide, deeply lobed: petals over 1 mm. long: fru 5-3 mm. wide, obscurely 
ribbed, Dares in ai etion.—Swamps, ditches, shallow ponds, and m uddy 
shores, various provinces, Fla. to Tex., Ark., nd Pa.; also Pacific Coast.— 
(W. L, C. 4, o. 3j 
7. H. americana L. Leaf-blades reniform, 2—5 em. wide, erenate-lobed; petals 
less than 1 mm. long: fruit 1-1.5 mm. wide, sharply ribbed, oval in eross- 
section.— ( MARSH-PENNY WORT. )—Moist thickets, wet banks, and swamps, 
various provinces, Coastal Plain only N, N. o Tenn., Minn., and N. 8. 
11. CENTELLA L. Perennial amphibious plants. Leaves clustered at 
the nodes. Umbels capitate. Sepals obsolete. Petals imbricate, white. 
Carpels without large oil-tubes, the promi- 
nent ribs anastomosing.—About 20 species, 
most abundant in Southern Afriea. 
1. C. repanda (Pers.) Small Leaves clus- 
tered; PE erect, 9-30 em. long (about 
2.5 em. long, and with tee fruit, in 
C. d ' floridana) ; blades thickish, 
ovate, 2-6 em. long, repa m cordate 
or nearly tr uneate at "ins base: peduneles 
bels 
wide. Hydrocotyle b anda Pers.]— 
Moist pinelands, lake-sho di and shallow 
ponds, ue Plain, Fla. o Tex., and Md. 
—(W. I., Mex., C dj “fall, or all year S. 
12. CYNOSCIADIUM DC. Annual herbs. Leaf-blades pinnately or 
palmately divided into narrow segments, or the basal leaves with entire blades: 
ce 
e 
epals persistent. Petals white, broadest 
above the middle. Fruit elongate: carpels 
with strong ribs, the lateral ribs more 
prominent: oil-tubes solitary in each inter- 
val or two in the inner face.—About 10 
species, natives of the north temperate zone. 
C. digitatum DC. Plant 2-6 dm. tall: 
leaf-blades, or segments, linear to linear- 
MD gic tk F 1-3.5 em. long: 
pediee fruit beaked.—Wet E 
gr uis poen Pla and adj. provinces, Ala. to Tex. and Ark.—Spr.-sum. 
