1887. | BOTANICAL GAZETTE. 103 
with many flowers and long pedicels, can be distinguished 
wv 
with difficulty. The fruit sections are but slightly different. 
e 
to Maryland. It would be proper to call this species H. am- 
bigua, but that name already has a place among the syn- 
differs in its smaller fruit more or less dotted with oil vesicles, 
its less flattened carpels, and less prominent dorsal and lat- 
eral ribs, thus intermediating between H. Canbyi and the 
first two species. There can be no doubt but that our three 
Species are the North American representatives of H. 
vulgaris. 
++-Fruit not notched; intermediate ribs not corky (figs. 49, 50). 
4. H. interrupta Muhl. Cat. 10. Umbels few-flowered, 
proliferous, forming an interrupted spike: pedicels very 
Short or none: fruit 1} to 2 lines broad; dorsal and lateral 
ribs very prominent ( figs. 49, 50).—Massachusetts to Flerida 
and Texas; also in Utah. 
** Fruit with pericarp uniformly corky thickened and ribs all fili- 
form (figs. 51-56): leaves not peltate: peduncles much shorter than 
petioles, 
+Fruit small (3 to 1} lines broad), without secondary ribs or reticu- 
lations: involucral bracts small or wanting. 
5. H. Americana L. Spec. 234. Stems filiform, branchin 
and creeping : leaves thin, round-reniform, crenate-lo ed an 
lobes crenate, shining: few-flowered umbels axillary and 
almost sessile: fruit less than a line broad ; intermediate ribs 
Prominent; no oil-bearing layer; seed-section broadly oval 
figs. 51, 52).—Throughout the North and southward to 
North Carolina. 
_ ©. H. ranunenloides L. f. Suppl. 77. Usually floating: 
leaves thicker, round-reniform, 3 to 7-clett lobes crenate: 
peduncles 1 to 3 inches long, reflexed in fruit: capitate umbel 
