AMMIACEAE 859 
leaves or longer : umbels proliferous, and forming an interrupted raceme, the whorls few- 
flowered : pedicels usually 1-3 mm. long: fruit depressed, 2 mm. high, 3-4 mm. broad, 
rounded or truncate at the base and apex, the ribs prominent, the dorsal acute, none of 
them corky. [H. interrupta Muhl.] 
In low grounds or swamps, Massachusetts to Arkansas, Florida and Texas. Spring to fall. 
6. Hydrocotyle australis Coult. & Rose. Similar to H. Canbyi in habit. Umbels 
proliferous, the 3-6 whorls few-flowered : pedicels 2-4 mm. long: fruit 2 mm. long and 
slightly broader, rounded at the base. 
In low grounds, Virginia to Florida and Texas. Spring to fall. 
7. Hydrocotyle cuneàta Coult. & Rose.  Resembling H. australis in habit. Umbels 
pones the few whorls few-flowered : pedicels very short : fruit 2 mm. long, 3-4 mm. 
road, tapering to the pedicels by a cuneate base. 
In damp places, Texas to California. Spring to fall. 
8. Hydrocotyle ranunculoides L. f.  Hootstocks extensively creeping, or often 
floating: leaf-blades rather fleshy, not peltate, reniform or orbicular-reniform, 2-5 cm. 
broad, 3-7-lobed, cordate, the lobes crenate : peduncles 1-8 em. long, shorter than the 
leaves: umbels capitate, 5-10-flowered : pedicels often 1-2 mm. long at maturity : fruit 
2-3 mm. broad, obscurely ribbed, oblong in cross-section. 
In ditches, swamps and shallow ponds, Pennsylvania to Florida and Texas. Also on the Pacific 
Coast from Oregon to Lower California. Spring to fall. 
9. Hydrocotyle Americàna L.  Rootstocks creeping, often producing elongated 
tubers: leaf-blades thin, not peltate, reniform, 2-5 cm. broad, crenate and crenate-lobed, 
cordate: peduncles very short: umbels axillary, few-flowered: nearly sessile: pedicels 
commonly less than 1 mm. long: fruit 1-1.5 mm. broad, slightly ribbed, oval in cross-sec- 
tion, the oil-bearing layer obsolete. 
In damp soil, Nova Seotia to Ontario and Minnesota, south to Pennsylvania and in the mountains 
to North Carolina. Spring to fall. 
2. CENTELLA L. 
Perennial herbs, with creeping or horizontal rootstocks. Leaves clustered at the nodes, 
with long erect petioles: blades entire or toothed, palmately nerved.  Bracts of the invo- 
luere 2-4, small. Flowers in capitate long-peduncled umbels. Hypanthium truncate. 
Sepals obsolete. Petals white, obtuse, imbricated. Disk flat or concave. Fruit lenticular, 
laterally flattened, suborbicular, cordate or reniform, smooth: carpels without large oil- 
tubes, the prominent ribs anastomosing. Seeds lenticular. 
1. Centella repánda (Pers. ) Small. Foliage glabrate or slightly pubescent. Root- 
stocks elongated : leaves clustered ; petioles erect, 10-30 cm. long; blades thickish, ovate, 
2-6 cm. long, obtuse, repand, cordate or nearly truncate at the base: peduncles usually 
several together, villous, 1-6 cm. long, mostly shorter than the petioles : umbels 2-4 flow- 
ered, chiefly capitate : fruit depressed, 4-5 mm. broad, prominently ribbed and reticulated. 
[ Hydrocotyle repanda Pers. } 
In sand or moist pine lands, Maryland to Florida and Texas.—A form from eastern Florida, with 
petioles about 2.5 em. long and larger fruit, is C. repanda Floriddna (Coult. & Rose) Small. [Hydrocotyle 
Asiatica var. Floridana Coult. & Rose.] 
3. BOWLESIA R. & P. 
Annual caulescent herbs, with stellate pubescence. Leaves opposite: blades merely 
. lobed. Flowers in simple, few-flowered umbels which terminate axillary peduncles. Sepals 
5, prominent. Corolla white. Disk rather flat. Fruit turgid, smooth : carpels ribless, 
becoming depressed on the back, nearly distinct: oil-tubes wanting or obsolete. Seed dor- 
sally flattened, the face essentially flat. 
1. Bowlesia septentrionàlis Coult. & Rose. Stems weak, 0.5-6 dm. long, dichoto- 
mously branched : leaf-blades reniform to ovate-cordate, 1.5-3 cm. broad, thin, 3—5-lobed, 
slender-petioled : umbels short-peduncled, 1-4-flowered : fruit about 2 mm. long, sessile or 
nearly so. 
In rich or shaded ground, Texas to California. Spring. 
4. SANICULA L. 
Biennial or perennial caulescent herbs. Leaves alternate: blades pinnatifid or pal- 
mately 3—7-foliolate: leaflets toothed or incised. Flowers usually unisexual, in irregular 
! Contributed by Mr. E. P. Bicknell. 
